JPS61276056A - Electronic calculator equipped with graph-display function - Google Patents

Abstract

PURPOSE:To attain the magnification and contraction of a graph to be displayed by setting the input state within the range of the graph to be displayed by operating various keys, by specifying two points on the screen of a displaying part, and by using the coordinate data of the said two points specified. CONSTITUTION:A magnification/contraction A-key 11g displays on the screen of the displaying part 19, an area that includes the two points specified by operating a plot key 11f as its diagonal vertexes, as the graph extended or contracted. The x and y coordinate data respectively stored in registers 17b, 17d, and 17c, 17e are compared with each other as to degrees of largeness. In accordance with the result of the said comparison, the coordinate is set in registers 17h and 17i and the y-coordinate in registers 17j and 17k as a new- range data. A graphic data in a register 17a is called out to an arithmetic pat 15, and the operation of the graph-display data within the new-range data is executed in accordance with an equation data. The result of the said operation is sequentially inputted to a buffer 14. When the said inputting ends, the magnified graph is displayed in the displaying part 19.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a small electronic calculator equipped with a graph display function that graphs and displays a functional formula with simple key operations.

[Prior art and its problems] Conventionally, in small electronic calculators such as personal computers and pocket computers, it has been possible to create a program such as BASIC and display a graph by inputting data such as functional formulas and numerical values. It is being considered to display the calculation results one dot at a time on the display section by inputting a calculation formula or a calculation formula, and finally displaying a graph.

However, among the above-mentioned conventional small electronic calculators such as personal computers and pocket computers, those that display graphs using a program require a dedicated program for that graph. It was not possible to display it easily. Furthermore, in the case where the calculation results are displayed dot by dot on the display section, the display data is stored in memory, so it is not possible to specify the enlargement or reduction of the graph.

[Object of the invention] This invention was made in view of the above-mentioned circumstances.
To provide a small electronic calculator equipped with a graph display function capable of enlarging/reducing a displayed graph with only simple key operations.

[Summary of the Invention] This invention sets the input state of the range of the displayed graph by various key operations, and by specifying two points on the screen of the display unit, enlarges/reduces from the coordinate data of the two specified points. The range data is calculated, and the displayed graph is enlarged or reduced based on the calculated range data.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings. FIG. 1 shows the circuit configuration thereof, and 11 is a key human power section. This key manual section 11 includes a numeric keypad 11a for inputting numerical data, a function key 11b for specifying calculation details, a function key 11C for inputting function data, an X key 11d1 for inputting range data of the X coordinate for scaling.
Y key 11e for inputting Y coordinate range data as well;
The coordinate data of the display range for scaling is displayed by blinking the point (
The plot (Pf
fiOt) key 11f, the enlargement/reduction A key (indicated as "enlargement/reduction A" in the figure) 11g which performs enlargement/reduction by inputting the coordinate data of the diagonal point of the display range, the X key 11d and the Y key 11e. Enter the range data of the display range by using the Scaling/Scaling B key (herein referred to as "Scaling/Scaling B") 11h, move the flashing pointer on the coordinate axes, and enter the range data of the displayed range. An enlargement key 11i for enlarging and an execution key (represented as rEXEJ in the figure) 11j for executing graph display are provided, and when these keys are operated, the key operation data is sent to the control unit 12. The control unit 12 performs circuit control operations according to key operation data from the key input unit 11, and includes a text display buffer 13 that stores coordinate data of a graph display pointer and a graph display buffer 14 that stores graph display data. , a calculation unit 15 that performs various calculations for displaying graphs, an execution pointer 16 that instructs execution of calculations for displaying pointers, a memograph type register 17a composed of RAM, etc., and a plot key 114.
px register 17b and PV register 17C1 that store coordinate data of diagonal points of scaling input by operation.
P'x register 17d, PV register 17e1 X register 17f1 that stores the X coordinate data of the display pointer Y register 17g that also stores Y coordinate data, Xm1n register 17h that stores range data, Xmax register 17i, Ymin register 17j1 Ymax xme that stores the value of X to be assigned to one function expression in register 17
mO register 172, ymem that also stores the value of Y
An o register 17m is provided, and inputs and outputs data to and from the arithmetic unit 15 according to control commands from the control unit 12. In addition to the memory section 17, the calculation section 15 includes a formula buffer 1 that stores function formula data according to instructions from an execution pointer 16.
8 and input/output data, perform calculations for displaying graphs, changing ranges, and displaying pointers and their coordinate data, and display the results of the calculations in the text display buffer above. 13,
Output to the graph display buffer 14. The text display buffer 13 stores display pointer coordinate data, and the graph display buffer 14 stores graph and pointer display data, and the stored data is sent to the display section 19. The display section 19 is composed of, for example, a dot matrix of 64 dots vertically by 96 dots horizontally using a liquid crystal display element, and uses data from the text display buffer 13 and the graph display buffer 14 to display graphs,
Displays the pointer on the graph line, pointer coordinate data, etc.

Next, the operation of the above embodiment will be explained. FIG. 2 shows key operations and the corresponding states of the display section 19.
First, it is assumed that the display unit 19 displays a graph for the mathematical formula y-sinx as shown in FIG. 2(1), and an X-axis and a Y-axis as coordinate axes. This graph display is made in advance by the key human power section 11.
This is done by inputting mathematical formulas and range data by operating the numeric keypad 111, function keys 112, and function keys 113. In this state, the data [y-sinxJ] of the above formula is input to the formula buffer 18, and the Xm1n register 17h and the Xmax register 1
Range data in the X-axis direction for 7i r-180J r18
0 J is also '1'm+n register 17jSYma
The range data in the Y-axis direction is stored in the x register 17k.
rI J are input respectively.

Here, as shown in Figure 2 (2), the coordinate data (30,0
, 7), operate the plot key 11f,
r30J with numeric keypad 11a1 function key 11b
r, J ro, 7 When J is pressed manually and the execution key 11j is subsequently operated, the processing shown in FIG. 3 is performed in response to the operation of the execution key 11j. That is, in the same figure, first, in step AO1, it is determined whether or not this is a plot command, that is, execution after operating the plot key 11f.
It is determined whether or not the key 11j is operated. If it is determined that this is not the case, other processing is performed according to the content of the key operated before the execution key 11j is operated, but here, execution key 11 after the plot key 11f is operated
Since it is a j operation, it is determined to be a plot command,
Next, proceed to step AO2. In step AO2, Px
The coordinate data input to the register 17b is transferred to the P'x register 17d, and the coordinate data input to the Py register 17G is transferred to the P-y register 17e. Since no coordinate data has been entered in 170, p
=x register 176SP-No coordinate data transfer input is made to the y register 17e either.

Next, in step AO2, the P-x register 17d1P'
The coordinate data (P-X, P
= V) based on Step A 03r Gua 7 display/<
A lighting signal is sent to the address of the position corresponding to the coordinates (P'x, P-y) of '/7714.

Here, as mentioned above, the P'X register 17d is still
, P=y Since no coordinate data has been input to the register 17e, no lighting signal is sent to the graph display buffer 14. Thereafter, as shown in step AO4, it is determined whether or not there is data input after operating the plot key 11f. Since the coordinate data "30" is input here, if it is determined that there is data, the process advances to step AO5.
The data operated next to that plot key 11f is “30
” is “,”, that is, whether input of the X coordinate data has been omitted. The result of this judgment is "NO", and in the following step AO6, the coordinate data "30" operated next to the plot key 11f is input and set in the px register 17b. Next, in step AO7, the input coordinate data "30" followed by the coordinate data "30" is
, '', it is determined whether the key operated next is the execution key 11j, that is, whether input of Y coordinate data has been omitted this time. The result of this judgment is also "NO", and in the subsequent step AO8, the coordinate data "0.7" operated next to the "," is input and set in the Py register 17G. This completes the input setting of the coordinate data specified by the operation of the plot key 11f, and in the following step AO9, the px register 17b1 PV register 1
The coordinate data (30, 0, 7) set in 7C is used in the XmemO register 112 for pointer text display.
It is input to the YmemO register 17m.

Thereafter, in step AIO, the control unit 12 selects an address in the graph display buffer 14 corresponding to the coordinate data input to the px register 17b and PV register 17G, and sends blinking data to the selected address.

Finally, in step A11, the contents of the graph display buffer 14 and text display buffer 13 are displayed on the display section 19 in accordance with the contents. Here, display section 1
9, in addition to the graph shown in Figure 2 (1),
Coordinates (P'X.

P'y), that is, the dot at the position (30, 0, 7) is displayed blinking as a pointer, and the contents of the Xmemo register 172 are sent to the text display buffer 13 as a coordinate display of this pointer, and the dot at the bottom of the screen is displayed. ni r X
The characters -30J are displayed.

Next, as shown in FIG. 2 (3), the above coordinate data (30
, 0, 7), the coordinate data of the diagonal point (60, 0,
3>, operate the plot key 11f and press r60J using the numeric keypad 11a and function key 11b.
When the keys r, J IQ, 3 J are pressed manually and the execution key 11j is subsequently operated, the processing shown in FIG. 3 is performed again in response to the operation of the execution key 11j.

That is, after it is determined in step A01 that it is a plot command, in step AO2 the above-mentioned FIG. 2 (2) is executed.
The coordinate data r3oJ ro and 7J input to the px register 17b and Py register 17C are respectively P'x
The signal is transferred and input to the register 17d and the PV register 17e. After that, P-x register 17d1P'y register 1
Based on the coordinate data "30" [0,7J input to 7e, a lighting signal is sent to the address of the position corresponding to the coordinates (30, 0, 7) of the graph display buffer 14 in step AO3. Next, in step AO4, set plot key 1
It is determined that there is data after the operation of 1f, and step AO5
Proceed to. If it is determined in step AO5 that the data immediately after the operation of the plot key 11f is not ",", then in step AO6, the data "60" immediately after the operation of the plot key 11f is newly input into the Px register 17b. Ru.

Subsequently, in step AO7, it is determined that the data operated after "," is not the execution key 11j, and step AO8
Then, the data [0,3J is stored in Py register 17c
is newly entered. In the next step AO9, the contents of the px register 17b and Py register 17c are transferred to the
, the coordinate data (6
0, 0, 3) in the graph display buffer 14, and sends blinking data to the selected address. Finally, in step A11, the contents of the graph display buffer 14 and text display buffer 13 are displayed on the display section 19 in accordance with the contents. Here, on the display unit 19, the graph shown in FIG. 2 (1) and the coordinates (30, 0, 7>
The dot at the position is lit up, and the dot at the coordinates (60, 0, 3) is displayed blinking as a pointer, and the Xmemo register 17β is displayed as the coordinate of this pointer.
The contents of are sent to the text display buffer 13, and the characters rX-60J are displayed as text at the bottom of the screen.

Although not explained in the above operation, step AO4
If the immediate execution key 11j is operated after the plot key 11f is operated and coordinate data is not input,
The plot of the pointer is set as the center point of the display section 19, and its coordinate data is omitted. Therefore, the process proceeds to step AI2 after step AO4, and the Xm1n register 17h is
, the range data rXminJ in the X-axis direction input to the Xmax register 17i, and the calculation (Xmin+Xmax)/2 using "Xmax" are performed, and the calculation result is displayed as the X coordinate data of the center point of the display section 19. The input signal is set to the Px register 17b.

After that, the process proceeds to step A13, where the calculation (Ymax+Ym t n)/2 is performed using the Y-axis direction range data rYminJ and rYmaxJ input to the Ymin register 17jSYmax register 17k, and the calculation result is displayed on the display section 19. This is input and set to the Py register 17c as Y coordinate data of the center point.

When the input to the px register iyb and the py register 17c is completed in this way, the processing of steps A09 to A11 described above is performed, and the display on the display section 19 is performed. Furthermore, if it is determined in step AO5 that the key force immediately after the operation of the plot key 11f is ",", the data input of the X coordinate is omitted, so the calculation shown in step AI2 is performed. After the calculation result is input and set in the px register 17b as the X coordinate data of the center point of the display section 19, the process proceeds to step AO7. Also, step A
If it is determined in O7 that the data input immediately after the data "," is the execution key 11j, it is determined that the Y coordinate data has been omitted, and the calculation in step A13 and the setting to the Py register 17c are performed. then step A
The processes from 09 to A11 are performed and displayed on the display section 19.

After that, as shown in FIG. 2 (4), enlarge/reduce the A key 11.
When g is operated, the displayed graph is enlarged or reduced by the process shown in FIG. That is, the enlargement/reduction A key 11G displays the display section 19 as a graph in which the area with the two points specified by the operation of the plot key 11f as diagonals is enlarged and reduced.
This is to display the entire screen, and in this process, first, as shown in step 801, the X coordinate data input to the PX register 17b is input to the P''x register 17d.
It is determined whether the X coordinate data is larger than the input X coordinate data.

Here, the value of the Px register 17b is "60", and P
'Since the value of the x register 17d is "30", it is determined that the value of the px register 17b is larger, and step 8
Proceed to step 02 and transfer the X coordinate data "60" input to the Px register 17b to the XmaX register 17i and P
’X coordinate data “3” input to the x register 17d
0'' to the Xm1n register 17h as new X coordinate range data, and then step 80
3. In addition, in step B01, conversely, the X coordinate data input to the P'x register 17d is
7t), the process proceeds to step 304, and step 80
In contrast to step 2, the value of the P'x register 17d is input to the xmax register 17i, and the value of the px register 17b is input to the xmin register 17h as new X coordinate range data, and then step 803 is entered.

In step 303, in order to set the range data for the Y coordinate in the same way as the range data for the X coordinate described above, the Y coordinate data input to the Py register 17C is input to the P'y register 17e. It is determined whether the value is larger than the Y coordinate data. If Py register 1
If the value of 7C is determined to be larger than the value of P'y register 1713, the value of py register 17C is ymax.
The value of p''y register 178 is 'y' in register 17k.
Each new Y coordinate range data is input to the min register 17j. However, here the value of Py register 17C is "0.3", and Py register 17C is "0.3".
Since the value of e is ro, 7J, p-y register 17e
It is determined that the value is larger, and the process then proceeds to step BO7.

In step BO7, contrary to the above step BO5, P
``Send the value of the y register 17e to the ymax register 17k,
The value of the Py register 17c is input and set to the Ymin register 11 as new Y coordinate range data, and here the data 0 is input to the Ymax register 17k.
．． 7” is stored in the Ymin register 17j as data “0.3”.
is input.

This completes the setting of the new range data, and in the following step 306, the graph formula data "y-sinxJ" stored in the graph formula register 17a is
Called on 5th. According to this called formula data,
In the next step BO8, the calculation unit 15 calculates display data for creating a graph within the newly set range data, and the calculation results are sequentially input to the graph display buffer 14. Then, when the input to the graph display buffer 14 is completed, an enlarged graph as shown in the figure is displayed on the display section 19 based on the display data input to the graph display buffer 14 in step BO9, and this enlargement/reduction A The processing for the key 11g operation ends.

In contrast to the enlargement/reduction of the displayed graph by operating the enlargement/reduction A key 11g, the operation of enlarging/reducing the displayed graph by operating the enlargement/reduction B key 11h will be described. The enlargement/reduction B key 11h is used to separately set the range data of the X coordinate and the range data of the Y coordinate in conjunction with the operations of the X key 11d and the Y key 118. That is, when the display section 19 is in the display state as shown in FIG. 2 (1) above, the X key 11 is pressed as shown in FIG. 2 (5).
Operate d to specify the input of the X coordinate range data, and use the numeric keypad 11a and function key 11b to select r-304.
If you manually press the r, J "60" keys and then operate the enlargement/reduction B key 11h, the process shown in the fifth factor is performed.

This is because the control unit 12 performs key sampling in the first step CO1, and the operation key is the enlargement/reduction B key 11.
After determining that the key is "h", it is determined in step CO2 whether the key operated at the beginning of the input is the X key 11d or the Y key 11e. Here, the operation key is X key 11d
However, if it is determined that it is not the Y key 1161, the X and Y coordinates are not specified and the displayed graph cannot be enlarged or reduced by the enlargement/reduction B key 11h, resulting in an error. If it is determined that the operation key is the X key 11d or the Y key 11e, then in step GO3 it is determined whether the operation key is the X key 11d.

Here, since the operation key is the X key 11d, the judgment result is rYesJ, and the process then proceeds to step CO4.
Out of the two numerical data input after the X key 11d, the larger numerical data is stored in the xmax register 171.
The smaller numerical data is input and set to the Xm1n register 17h as the range data of the X coordinate. Therefore, the numerical data "60" is stored in the XmaX register 17i.
However, the numerical data "-30J" is input and set in the ><mtn register 17h. If it is determined in step CO3 that the operation key is not the X key 11d, the operation key is the Y key 11e. Then, the process proceeds to step CO5, and of the two numerical data input after the Y key 1ie operation, the larger numerical data is stored in the YmaX register 17k, and the smaller numerical data is stored in the Ymin register. 17j as the range data of the Y coordinate.

After entering the range data, the next step is step CO.
6, the function formula data "y-sinxJ" of the graph stored in the graph formula register 17a is called to the calculation section 15.According to this called function formula data, in the next step CO7, the calculation section 15 calculates the new Display data is calculated for graph creation within the set range data.

Here, the Xm1ri register 17h and the Xmax register 171 each contain the X coordinate range data "-30J".
60", and the Y-coordinate range data "-1" is stored in the Ymin register 17j and ymax register 17k, respectively.
” and “1” are input, and the calculation results within this range data are sequentially input to the graph display buffer 14. When the input to the graph display buffer 14 is completed, a graph enlarged in the X-axis direction as shown in the figure is displayed on the display section 19 based on the display data input to the graph display buffer 14 in step CO8.
This completes the processing for this enlargement/reduction B key 11h operation.

Next, to perform scaling in the Y-axis direction, operate the Y key 11e to specify input of Y-coordinate range data, as shown in FIG. If you manually press the "0" r, J N J keys and then operate the enlargement/reduction B key 101,
The process shown in FIG. 5 is performed again. That is, first, in step CO1, it is determined that the operation key is the enlargement/reduction B key 11h, then in step CO2, it is determined that the key operated at the beginning of the input is the X key 11d or the Y key 11e, and then in step CO3. And that operation key is X key 1
It is determined that it is not 1d, and the process then proceeds to step CO5. In this step C05, among the two numerical data ro J rI J input after operating the Y key 11e, the larger numerical data "1" is inputted into the YmaX register 17k, and the smaller numerical data "0" is inputted into 'y'. m+n register 17
Input and set each j as the range data of the Y coordinate.

After inputting the range data, the next step is step CQ.
In Step 6, the function formula data [y-sinxJ of the graph stored in the graph formula register 17a is called by the calculation unit 15, and in accordance with this called function formula data, the calculation unit 15 sets the above-mentioned newly in the next step CO7. Display data is calculated for graph creation within the specified range data. Here, xm+n register 17h%X
maXl, 'Raster 1 file i has X coordinate range data ``-30J'' and ``60'', respectively, and Ymin register 17j.

Y-coordinate range data "0" and "1" are respectively input to the ymax register 17k, and the calculation results within this range data are sequentially input to the graph display buffer 14. Then, when the input to the graph display buffer 14 is completed, the display section 19 is displayed based on the display data input to the graph display buffer 14 in step CO8.
A graph enlarged in the Y-axis direction as shown in FIG.

In the above example, only the operation of enlarging the displayed graph has been described, so the operation of reducing the displayed graph will be explained below. FIG. 6 shows the key operation and the corresponding display state of the display section 19. First, as shown in FIG. 6 (1), a graph is displayed on the display section 19 in the same state as in FIG. 2 (1) above. Assume that it is displayed. Here, the functional formula data "y-sinxJ" is input to the formula buffer 18, and xm
The range data r-180J r180J in the X-axis direction is stored in the tn register 17h and the Xmax register 17i, and the Ymin register 17j1 and the Ymax register 17k.
Range data r-I J rI J in the Y-axis direction are respectively input.

Here, as shown in Figure 6 (2), the coordinate data (-36
0, 2), operate the plot key 11f, and use the numeric keypad 11a1 and function key 11b to input r-3.
When the keys 60J r and J r2 J are pressed manually and the execution key 11j is subsequently operated, the processing shown in FIG. 3 is performed in response to the operation of the execution key 11j. In the figure, it is first determined in step AOI that this is a plotting command, and then in step AO2, the Px register 17b
Coordinate data input in P″XX register 1fud
Also, the coordinate data input to the Py register 17G is transferred to the P'y register 178, respectively. Here, since coordinate data has not yet been input to the Px register 1yb and the Py register 17G, the p-x register 17d.

No coordinate data transfer input is made to the P'y register 17e either. Next, in step AO3, a lighting signal is sent to the address of the graph display buffer 14 at the position corresponding to the coordinates (P'x, P'y). Here, as mentioned above,
Since coordinate data has not yet been input to the P'X register 17d1P'y register 17e, no lighting signal is sent to the graph display buffer 14. Thereafter, if it is determined in step AO4 that data has been input after the operation of the plot key 11f, the process advances to step AO5, and the data r-3604 operated next to the plot key 11f is "
,” is determined. The result of this judgment is rN
oJ, and in the following step AO6, the coordinate data r-360J operated next to the plot key 11f is input and set in the Px register 17b.

Next, in step AO7, this coordinate data r-3604
It is determined whether the key operated next to "," which was inputted following "," is the execution key 11j.

The result of this judgment is also "NO", and the following step AO8
The coordinate data "2" operated next to that "," in
is input and set in the Py register 17c.

This completes the input setting of the coordinate data specified by the operation of the plot key 11f, and in the following step AO9, the coordinate data (-360, 2) set in the Px register 17b and PV register 17c is used for the text display of the pointer. > (Input to memo register 17β and ymemo register 17m. Then, in step A10, the control unit 12 inputs the Px register 17b and PV register 17.
An address in the graph display buffer 14 corresponding to the coordinate data input to C is selected, and blinking data is sent to the selected address. However, in this case, the graph is reduced, and the coordinate data (-360
, 2) does not exist in the graph display buffer 14 and cannot be selected, no blinking data is sent to the graph display buffer 14. Finally, in step A11, the graph display buffer? 14 and the contents of the text display buffer 13 are displayed on the display unit 19. Here, in addition to the graph shown in FIG. 6(1), the display unit 19 displays the coordinates of this pointer)<memo register 17j
The contents of 2 are sent to the text display buffer 13, and the characters "X--360J" are displayed at the bottom of the screen.

Next, as shown in FIG. 6 (3), the above coordinate data (-3
Coordinate data (360, 2') of the diagonal point
-2) Operate the plot key 11f to input
R360 with numeric keypad 11a1 function key 11b
When J I', J r-2J are pressed manually and the execution key 11j is subsequently operated, the operation of the execution key 11j is again shown in FIG. 3, after being determined to be a plotting command at step AO1. In step AO2, the coordinate data [-360J r2 input to the PX register 17b and PV register 17c in FIG.
J is transferred and input to the P'X'L/register 17d%PV register 17e, respectively.

After that, P′x register 17d, P”y register 17e
Based on the coordinate data r-360J r2 J input into the , a lighting signal is sent to the address of the position corresponding to the coordinates (-360, 2) of the graph display buffer 14 in step AO3, but such an address does not exist. As a result, the lighting data is not stored.

Subsequently, in step AQ4, it is determined that there is data after the operation of the plot key 11f, and the process advances to step AO5.

If it is determined in step AO5 that the data immediately after the operation of the plot key 11f is not ",", then step AO
At step 6, the data "360" immediately after the operation of the plot key 11f is newly input to the px register 17b. Subsequently, in step AO7, it is determined that the data operated after "," is not the execution key 11j, and step AO7 is executed.
Proceed to step 8, and the data “-2” is stored in Py register 17c.
is newly entered.

In the next step AO9, the contents of the Px register 17b and PV register 11C are changed to ><marno register 172, Ym.
The data is transferred to the emO register 17m, and in step A10, the control unit 12 transfers the Px register 1yb and the py register 17c.
An attempt is made to select an address in the graph display buffer 14 that corresponds to the coordinate data (360°-2) input in is not carried out either. Finally, in step A11, the contents of the graph display buffer 14 and text display buffer 13 are displayed on the display section 19 in accordance with the contents. Here, in the display unit 19, the graph shown in FIG. 6(1) and the contents of the Xmemo register 172 are sent to the text display buffer 13 as a coordinate display of the pointer that is not displayed.
The characters rX-360J are displayed at the bottom of the screen.

Then, as shown in FIG. 6 (4), enlarge/reduce the A key 11.
When o is operated, the displayed graph is enlarged or reduced by the process shown in FIG. 4 above. That is, first step BO1
As shown in FIG.
It is determined whether the coordinate data is larger than the X coordinate data input to the P-x register 17d. Here, Px
Since the value of the register 171) is 360J and the value of the P-x register 17d is r-360J, it is determined that the value of the px register 17b is larger, and step 302
Then, the X coordinate data input to the Px register 17b [360J is input to the xmax register 17i, and
X coordinate data r-3 input to the x register 17d
60J to Xm1n register 17h, respectively new X
Input and set as coordinate range data, then step B
Leads to O3. In step 803, in order to set the range data for the Y coordinate in the same way as the range data for the X coordinate described above, the Y coordinate data input to the Py register 17c is input to the P'y register 17e. It is determined whether the value is larger than the Y coordinate data. Here, the value of Py register 17C is "-2" and the value of Py register 17e is "2", so P'y register 1
It is determined that the value of 7e is larger, and then step 307
Proceed to. In step 307, (ilr2J of the P=y register 17e is input to the YmaX register 17k, and the value "-2" of the Py register 17c is input to the Ymin register 17j as new Y coordinate range data.

After setting the range data, in the following step BO6, the function formula data [y-sinxJ of the graph stored in the graph formula register 17a is called to the calculation unit 15, and the next step is executed according to the called function data. 308
Then, the calculation unit 15 calculates display data for creating a graph within the newly set range data.

Here, Xm1n register 17h, Xmax register 1
7i has the X coordinate range data “-360J,
``360J also has Ymin register 17j, Yma
Each x register 17k contains Y coordinate range data r.
-2J and r2J are input, and the calculation results within this range data are sequentially input to the graph display buffer 14. Then, when the input to the graph display buffer 14 is completed, a reduced graph as shown in the figure is displayed on the display section 19 based on the display data input to the graph display buffer 14 in step BO9. The process of reducing the displayed graph in response to the operation of the reduction A key 11g is completed.

Next, the operation of enlarging the displayed graph using the enlargement key 11i will be explained with reference to FIGS. 7 and 8. FIG. 7 shows key operations including the enlarged key 11i and the corresponding states of the display section 19. First, as shown in FIG. 7 (1), the same state as in FIG. 2 (1) above is shown. Assume that a graph and coordinate axes are displayed on the display unit 19. Here, data l"y-sinxJ of the function formula is input to the formula buffer 18, and the Xm1n register 17h and the XmaX register 1
7i has range data in the X-axis direction r-180J [
180J is also the Ymin register 11j1YmaX
In the register 17k, range data in the Y-axis direction “-1” “
1" is input in each case.

Here, when the enlargement key 11i is operated as shown in FIG. 7(2), the processing shown in FIG. 8 is performed in response to the operation of the enlargement key 11i. That is, in the figure, first in step DO1 it is determined whether or not the X-axis is being displayed.Since the X-axis is being displayed here, the process then proceeds to step DO2, where the data in the graph display buffer 14 is displayed. Select the display address corresponding to the left end of the X axis of the display section 19,
Send blinking data to that address. This display section 19
The left end of the X axis is set to coordinate data (xmin,
O), and in this case its coordinates are (-1
80, O), and the blinking data is written to the address of that coordinate position, the display unit 19 will be displayed according to the blinking data.
A pointer is displayed on the cursor key or the X key 11d for specifying the next left/right movement as shown in the subsequent step [)03.

Furthermore, if it is determined in step DO1 that the Also use the coordinate data (Xmin.

Blinking data is written to the address corresponding to the left end of the display section 19 in the graph display buffer 14 represented by Ymin), a pointer is displayed on the display section 19 according to the blinking data, and then the process proceeds to step DO3.

While waiting for key input in step 003, if the cursor key for specifying movement to the right among the function keys 11b is operated as shown in FIG. 7(3), the key input will proceed to step DO5. , it is determined whether this key manual force is due to the operation of the X key 11d. Here, this key input is due to the cursor key operation specifying movement to the right, so the judgment result is "N".
"O", and the process then proceeds to step 006. Step DO
At step 6, a plot point of the pointer is calculated and set in accordance with the moving direction of the operated cursor key. here,
The pointer plot point calculation is based on the dot unit "xl" calculated from the formula % (the number of dots is 95 in this case, for example), and if the cursor key movement direction is right, the plot point - current point + ×1 Also, if the direction of movement of the cursor key is to the left, the X coordinate can be found using the following formula: plot point - current point -
), and in accordance with the plot points obtained from this calculation result, execute the plot display in the following step QO7,
The key standby state again occurs in step [)03.

In this way, by operating the cursor key to specify rightward movement multiple times and repeating the operations of steps DO3 and DO5 to D07, when the pointer is displayed at the desired position,
When the X key 11d is operated for the first time to set range data, it is determined in step 005 that the operated key is the X key 11d, and the process then proceeds to step [)08. In step [)08, this X key 1
This is to judge whether or not the operation 1d is the first time, and since it is still the first time, the process proceeds to step D09, and the X coordinate data of the plot point of the current pointer is
' Set the input to the X register 17d, and repeat step D above.
At O3, key personnel are on standby.

Next, as shown in FIG. 7 (4), operate the cursor key multiple times to specify movement to the right again, and complete step 0 above.
03, repeat the operations from DO5 to [)07 to move the pointer to the right. In this case, a cursor key that moves the pointer to the left may be operated.

Then, when the pointer is displayed at the desired position, as shown in FIG. 7 (5), the X key 11 (j) is operated for the second time to set the range data. It is determined that the operation key is the X key 11d, and the process then proceeds to step 008.Step 00
If it is determined in step 8 that this operation of the X key 11d is not the first time, the process proceeds to step [)10, where the X coordinate data of the plot point of the current pointer is stored in the px register 17b.
Set input to .

Next, in step D11, the above step [)09
The value of p=x register 17d set in step [)
It is determined whether the value is smaller than the value of the Px register 17b set in step 10. In this case, the value of the p-x register 17d is smaller than the value of the PX register 17b, so in step D12, the value of the Px register 17b is set to xmax register 17i, and the value of P-x register 17d is set to xmin.
Each is transferred to the register 17h as range data of the X coordinate and inputted.

Furthermore, if it is determined in step [)11 that the value of the P'x register 17d is not smaller than the value of the Px register 17b, the second plot point is more negative than the first plot point. direction, that is, to the left.Next, proceed to step D13, and change the value of the P-x register 17d to Xma, contrary to step [)12 above.
Set the value of PX register 17b to x register 17i as Xm1.
Each data is transferred to the n register 17h as range data of the X coordinate and inputted. After setting the new X coordinate range data, next in step [)14,
Formula data stored in the graph formula register 17a and Xm1
New X coordinate range data stored in the n register 17h and the Xmax register 17i and the Ymin register 17
Display data is calculated in the calculation unit 15 using the Y coordinate range data stored in the Y coordinate register 17, and the calculation result is sent to the graph display buffer 14. As a result, an enlarged graph is displayed on the display unit 19. Ru. At the same time, as shown in step [)15, it is determined whether or not the Y-axis is displayed on the graph on the display section 19. In this case, the Y axis is displayed, so next step 016
Go to the top of the displayed Y axis, i.e. the coordinate
Graph display buffer 1 corresponding to (0°'1'max)
Blinking data is written to the address at position 4, and the pointer is displayed on the display unit 19 according to the blinking data, and the cursor key or Y key is used to specify the next vertical movement as shown in step D17. 11e is in a standby state for key human power.

If it is determined in step D15 that the Y-axis is not displayed, the process proceeds to step [)18, where Xm+n
Use the value of the register 17h or the XmaX register 17i, whichever is closer to "0", for example, [Xm1nJ, to decrement the coordinates by 1 (Xmin.

Blinking data is written to the address corresponding to the upper end of the display section 19 in the graph display buffer 14 represented by Ymax), and a pointer is displayed on the display section 19 according to the blinking data, and then the process proceeds to step D17.

While waiting for key input in step D17, if the cursor key for specifying downward movement among the function keys 11b is operated as shown in FIG. 7(6), the key input will proceed to step D19. , it is determined whether this key manual force is due to the operation of the Y key 11e. Here, this key input is based on the cursor key operation that specifies the downward movement, so the judgment result is "N".
"O", and the process then proceeds to step D20. Step D2
0, the plot point of the pointer is calculated and set according to the moving direction of the operated cursor key. here,
The calculation of the plot point of the pointer is performed using the formula Yl-(Ymax
Based on the dot unit "Yl" calculated from -Ymin)/l'tir (the number of dots is, for example, 63 in this case), if the direction of movement of the cursor key is upward, the plot point - current point + Y1. If the moving direction of the cursor key is down, the Y coordinate can be calculated using the formula: Plot point - Current point - Yl (X coordinate is "0")
), and in accordance with the plot points obtained from this calculation result, a plot display is executed in the subsequent step D21,
The key standby state again occurs in step D17.

In this way, by operating the cursor key for specifying downward movement multiple times and repeating the operations of steps 017 and Q19 to 021 above, when the pointer is displayed at the desired position,
When the Y key 11e is operated for the first time to set range data, it is determined in step D19 that the operated key is the Y key 11e, and the process then proceeds to step [)22. In step D22, this Y key 11
This is to judge whether or not the operation of e is the first time, and since it is still the first time, the process proceeds to step 023, and the Y coordinate data of the plot point of the current pointer is set as P'.
Set the input to the y register 17e, and repeat step D1 above.
At 7, key personnel are on standby.

Next, as shown in FIG. 7 (7), the cursor key for specifying downward movement is again operated multiple times, and step D is completed.
17. Repeat the operations from DI9 to D21 to move the pointer downward. In this case, a cursor key that moves the pointer upward may be operated.

Then, when the pointer is displayed at the desired position, the Y key 11e is operated for the second time to set the range data as shown in FIG. It is determined that the key is the Y key tie, and the process then proceeds to step D22. Step D22
If it is determined that this operation of the Y key 11e is not the first time, the process proceeds to step D24, where the Y coordinate data of the plot point of the current pointer is input and set in the Py register 17G.

Next, in step Q25, the value of the P'y register 17e set in step D23 is changed to step D24.
It is determined whether the value is smaller than the value of the Py register 17c set in . In this case, the value of the p-x register 17d is px
Since the value is not smaller than the value in the register 17b, the value in the P-Y register 17e is set to Ymax in step D26.
Set the value of py register 17c to register 17k as "y'm".
The data is transferred to the in register 17j as range data of the Y coordinate, and set as input. Also, step 02 above
If it is determined in step 5 that the value of the Py register 17e is smaller than the value of the Py register 17C, the second plot point is located in the positive direction, that is, in the upper direction, than the first plot point. Then step D27
Proceeding to step [)26, the value of the Py register 17c is transferred to the YmaX register 17k, the value of the p”y register 17e is transferred to the Ymin register 17j, and Y
Transfer as coordinate range data and input settings. After setting the new Y coordinate range data in this way, R
Later, in step D28, the graph register 17a
Formula data stored in Ymin register 17j, Ym
New Y coordinate range data stored in the ax register 17, Xm1n register oh, and xmax register Ut
The display data is calculated in the calculation unit 15 using the X coordinate range data stored in the ?
14, and as a result, the enlarged graph is redisplayed on the display unit 19, and the process of enlarging the displayed graph accompanying range data designation on the display coordinate axes by operating the enlargement key 11i is thus completed. Note that when this enlargement key 11 is used, range data is specified only on the coordinate axes of the displayed graph, so it is not possible to set a range that is not displayed as range data, and therefore the displayed graph is reduced. It is not possible.

[Effect of the Invention] As described above, according to the present invention, by setting the input state of the range of the displayed graph by various key operations and specifying two points on the screen of the display unit, the specified two points can be The range data for scaling is calculated from the coordinate data of Therefore, it is possible to provide a small-sized electronic calculator having a graph display function that is extremely easy to operate and can be used to enlarge or reduce a displayed graph.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a block diagram showing the circuit configuration, and FIG. 2 shows an enlarged display of the graph on the display section by key operations and the corresponding first and second methods. Figure 3 is a flowchart showing the processing in response to the execution key operation, Figure 4 is a flowchart showing the processing in response to the enlargement/reduction A key operation, and Fig. 5 is a flowchart showing the processing in response to the enlargement/reduction A key operation.
Flowchart showing processing for key operations; FIG. 6 is a diagram showing key operations and the state of reduced graph display on the display section according to the first method described above; FIG. 7 is a diagram showing key operations and the corresponding third method FIG. 8 is a flowchart showing the processing in response to the operation of the enlargement key. 11... Key human power department, 11a... Numeric keypad, 11b
...Function key, 11G...Function key, 1
1d...X key, 11e...Y key, 11f...
Plot key, ILQ...Scale A key, 11h.
・Enlarge/reduce B key, it+...Enlarge key, 11j・
...Execution key, 12...Control section, 13...Text display buffer? , 14... graph display buffer, 15.
...Arithmetic unit, 16...Execution pointer, 17...Memory part, 17a...Graph expression register, 17b...P
xX register 17c...Py register, 17d...
P'X register, 17e...P-y register, 17f
...X register, 17g...Y register, 17h.
Xm1n register, 17i-%max register, 17j
...Ymin register, 17k...ymax register, 171. -XmemO register, 17m...Ym
Emo register, 18... Formula buffer, 19...
Display section. Applicant's agent Patent attorney Takehiko Suzue No. 2 Figure 1-1 Figure 2-2 Range Xm1n -30Xmax 60Ymin
OYmax 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 "F/)2 Figure 8 1 of 1 Figure 8 '12

Claims (1)

[Claims] An input means for inputting a function formula, a calculation means for performing a calculation according to the function formula input by the input means, a graph display means for displaying a graph on a display unit according to the calculation result of the calculation means, a range input setting means for setting the input state of range data of a graph to be displayed on the display section by key operation; and a coordinate specifying means for specifying coordinate data of two points with respect to the display section in conjunction with the range input setting means. , a range calculation means for calculating range data of the graph displayed on the display section from the coordinate data of the two points by the coordinate designation means; 1. A small electronic calculator having a graph display function, characterized in that it is equipped with a display control means for controlling enlargement or reduction of a graph.