JPS61269765A - Small-sized electronic computer equipped with graph displaying function - Google Patents

Abstract

PURPOSE:To confirm without fail and comprehensibly a scope data and to always display a graph in a scope suitable for purpose by displaying in a lump, the scope data of the variable in the function preset to the register, to a displaying part. CONSTITUTION:When the graph displaying is executed, a graph key 1D and a function key 1C of a key input part 1 are operated, and the data of the function formula are inputted into a formula buffer 7 in accordance with the executing pointer indicated by an executing pointer 4. Next, a calculating part 5 executes the calculation to substitute the independent variable for the function formula, based upon the scope data of the variable in the function preset at registers 3I-3L of a memory part 3. Next, the graph displaying data are successively prepared and displayed at a displaying part 8. In such a case, when the scope data are preset, the scope data preset at the time of presetting are in a lump displayed at the displaying part 8. Thus, the scope data can be confirmed without fail and comprehensively, and the graph displaying of the scope suitable for the purpose can be always executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a small electronic calculator having a function of displaying a functional formula in a graph.

[Prior art]

Conventionally, small electronic calculators that display functional formulas graphically have been considered. In this type of small electronic calculator, for example, when displaying a graph of the function formula % formula % on a 7-trix type display section of a flat plate machine, the following key operations are performed.

In other words, the current display range is x: 0-10 Y: 0~[0 If so, first perform a key input operation for this display range.

Next, σ) Key operations are performed to input all the coordinates (x, y) of the display body to be actually lit within the input display range at coordinate intervals desired by the operator.

[Problems with conventional technology]

However, with the above-mentioned conventional technology, since the input display range, that is, the range data of the variables There was a risk of inputting data in a range that was not intended.

[Purpose of the invention]

An object of the present invention is to provide a small-sized electronic calculator equipped with a graph display function that allows range data to be checked reliably and easily and that allows graphs of the intended range to be displayed at all times.

[Key points of the invention]

The gist of the present invention is to display range data all at once on a display unit.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram of a small electronic calculator equipped with a graph display function. 1 in the figure is a key input section, and this key input section 1 has a ten *-IA% provided in a normal calculator.
7 Anonymous key IB, 1M function key for inputting a number calculation formula 10% function formula) 17 Graph key 1D for specifying the display mode.

Range key IK for specifying the input mode for each range data of independent variables X, Y, and dependent variable Y included in the function formula; KXK (execution) key 11F for instructing execution of function calculations, etc.
At least four cursor keys 1G are provided for moving the cursor up, down, left, and right, respectively, and signals from each key are sent to the control unit 2 and processed.

The control unit 2 consists of a ROM (leat only memory) that stores a refogram that controls all operations of this computer, an instruction decoder, etc., and a memory unit 6.
, the execution pointer 4, the calculation section 5, and the display buffer section 6 with various control signals.

The memory [5] consists of a RAM (random access memory), an address decoder, and the like, and when performing a function operation, the execution pointer 4 is set by the control unit 2. The execution pointer 4 is temporarily saved in the pointer register 5A, and a cursor. Pointer 3B% Work register 6C1 Flag register 3D, in which three 7 lags (described later) are set respectively in FIG. register 3ks
y□Lz register 51P1 The current coordinates (x, y) are set respectively in the X register 5G, y register 3H, the minimum value and maximum value of the range data of the independent variable X are set respectively nx
min register 6d, Numeric value is written nxme]m”o register 3M53'men6
Register 3N.

A save area A to which each display data is transferred for temporary save from the graph display buffer 6A1 and the text display buffer 6B forming the display buffer section 6 when performing either text display or graph display, which will be described later.
(5p) and evacuation area B (6Q).

Each data of the function formula inputted from the key input section 1 is read into each end of the formula buffer 7 indicated by the execution pointer 4 n1, and then read into the calculation section 5.

The arithmetic unit 5 executes arithmetic operations on the functional formula output from the formula buffer 7 using the registers 68 to 3Q of the memory unit 6 under the control of the control unit 2.

The calculation unit 5 reads out the data for displaying the graph from the memory unit 3 when executing the function calculation and displays it in the display buffer unit 6.
In addition, when performing normal numerical display, the data for that purpose is sent to the text display buffer 6B, and the display data is sent to the display section 8, where it is displayed on the galley 7 or when displaying numerical values, etc. It will be done.

The display unit 8 consists of a liquid crystal display device, for example, and has 91 pixels in the X direction.
Data is displayed using 64 dots (coordinate points) in the Y direction.

Next, the configuration of the flag register 6D will be explained with reference to FIG. 2.This flag register! LD is range key 1]
Range 7 lag 6D-1 where a flag is set according to the operation of lG, 7 lag is set when a number is entered using the numeric keypad when the cursor is not at the end of the line.
Lag 6D-2, when the cursor is not at the end of the line and the cursor is moved after setting the number, update 7 where ``7 Lagby'' is set.
It has lugs 6D-6.

Next, the operation will be explained with reference to FIGS. 3 to 7. Figure 7 (A) shows when the range key IK is operated (by then, Xm1n register 6, xm ax register,
J S7m'in register! IKs7max cash register 7ri 6
The contents of the range data (range display data) in the X direction and the Y direction respectively set in L are shown.

That is, when the range key 1E is operated, the chart 70 in FIG. 3 starts, and first, in step R1, it is determined whether or not the range 7 lug 6D-1 is set to 7 lug''. If the text display buffer 76B has been set with text display data as shown in FIG. 7(0), the text data will be moved to the save area A (5P), and at the same time, the cursor pointer at that time is also transferred to cursor pointer register 3.
Step R is read out from B and saved to B (5Q).
It is evacuated by the process in step 6. 1゜Thea, f?
In step R4, the range display data set in each of the registers 31 to 6L described above is transferred to the text display buffer 6B. Therefore, as mentioned above, the display contents of the display section 8σ) change as shown in FIG. 7(0) to FIG. 7(A), for example.

Next, in step R5, range 7 lag 6D-1 to 7 lag'')
tli is set, then the process of step R6 is executed, and the cursor key 1G is operated to move the cursor next to the displayed character rXmin:J.

This is because the user will next operate the numeric keypad IA to change the above-mentioned range data to other content.

Therefore, when the range key 1E is operated again to enter the process of chart 70 in FIG. 3, in step R1, YI
It becomes IC3, and the process proceeds to step R7.

Therefore, it is determined whether the 7 lag of the 7 lag 3D-2 is "B" or not, but as mentioned above, in order to change the range data, one person operates the numeric keypad and the flag is set to "1". (For this numeric processing, refer to 7 in Figure 4.)
0- ffl is described in the chart).

Therefore, the process proceeds to step R8, where the range display data in FIG. 7(A) is updated to other contents and written into the above-mentioned registers 6E to 6L, respectively. This process will be explained with reference to chart 70 in FIG.

When the update of the range display data is completed in step R8, the process advances to step R9 to clear the contents of the graph display buffer 6A and clear the graph data corresponding to the range data before updating, and then in step R1Q the flag register 6D1 is cleared. In other words, the range flag! ID1,
Clear all of the setting number 7 lag D-2 and update 7 lag 6D-6. Next, in step R11, the text display data in the save area A is transferred to the text display buffer 6B, and at the same time, in step R12, the cursor data in the save area B is also returned to the cursor pointer 6B, so that the display content on the display section 8 is , the range display data that has just been updated disappears, and the content returns to the previous text display data shown in FIG. 7(0).

Note that if the range display data is not updated by only operating the range A-Im, steps R1 and R7 are performed.
, R10 to R12 are executed, and the display state of the original text display data is restored.

Next, to explain the number entry process in FIG. 4, when one numeric keypad is operated, first, in step 1, it is determined whether or not the cursor is at the end of the line.

If it is YIcS, then σ) The flowchart ends and the process waits for the next number setting process. On the other hand, in MO.

Then, proceed to step 2, input the numeric data to the text display buffer 6B at the current cursor position using the numeric keypad, and then proceed to step 6 to input the numeric value data to the text display buffer 6B at the current cursor position.
1 to move the cursor one digit to the right. And in step 4 update 7 lag 5D-3, set number 7 lag 6D-
A flag "1" is set for each of the 70-charts and the 70-chart ends.

Next, the range data update process will be explained with reference to Fig. 6.
First, the cursor is set next to the character "x-1n" J of the range display data up to n that is currently being displayed (step 81). The contents of the text display buffer 6B stored after the cursor position, that is, the contents of one line after the cursor (updated Xm1n data)
is sent to the register 60 (step S2), and then further sent to and set in the third register t''Xm1n (step S6).

Subsequent steps S4-S6, S7-S9.810-S12
As is obvious from the illustrated contents, these are the updates of the maximum value in the X direction, the minimum value in the Y direction, and the maximum value in the Y direction of the range display data, respectively.

Note that the screen area indicated by diagonal lines in FIG. 7 (Bl) indicates the area in which the cursor can be moved when updating the range data described above.

FIG. 5 is a flowchart showing the processing when the KXI key 1F is operated. Next, to explain this, for example, if the EXE key 11F is operated in the display state shown in FIG. 7(A), the range data has already been updated after the number entry process in FIG. If so, the update 7 lag 6D-6 is "B", and the process advances to step E2.Then, the digit σ) where the cursor is currently located is NU
Write IILooDl (blanking foot °),
Next, the process shown in step E3, II, is the process of moving the cursor to the beginning position of the next line. Next, the update 7 lag 6D-6 is cleared (Step E4), and then the process goes to Step E5, where it is checked whether the cursor is at the limit position ('F0) from the line Y. It is determined, and if it is within the limit position, the process is terminated. On the other hand,
When the cursor is at the limit position, the process advances to step R7 in FIG. 3, and steps R8 to R12 are executed.

On the other hand, when it is determined in step E1 that the update 7 lag 6D-6 is not "BI", execution of the processes from step E3 onwards is started.

Also, as shown in the third line of FIG. 7(0), a function Y=si
To display the graph of nX, press the graph key I
The D% function key 1C is operated to input the data of the above-mentioned function formula into the formula buffer 7 according to the execution pointer indicated by the execution pointer 4. Then, the calculation unit 5 reads the register 6.
Based on the range data preset in E ~ 6L, execute the operation of substituting the independent variable are displayed on the display section 8.

In this case, registers 3A to 6N in memory section 3 are used, but detailed operations thereof will not be explained. However, when the range data is preset as described above, the range data preset at the time of presetting is displayed all at once on the display section 8, and can be visually checked.In addition, when a function formula is input as described above, the range data preset at that time is displayed all at once on the display section 8. It has a feature that a graph is automatically displayed on the display section 8 based on the range data.

Note that the range data may not only be set by key input, but also several sets of range data may be stored in advance in the computer and one of them may be selected by key operation.

〔Effect of the invention〕

As explained above, the present invention is a small electronic calculator that displays range data of variables in a function and a graph of the selected function formula on a display unit, and the range data is displayed on the display unit. Because it is displayed all at once, you can visually check the contents of the range data that is currently being selected or updated, which has the advantage of being able to always display the graph of the function in the desired range.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a small electronic calculator equipped with a graph display function according to an embodiment of the present invention, and Fig. 2 shows a flag register 3.
The block diagram of D, FIGS. 3 to 6, explains the operation 70.
- Chart, Figure 7 is 8 diagrams of various display forms. [A...numeric keypad, 1B...7 keypad,
1C...Function key, ID-graph key, IE...Range key, 11F...'EXE (execution) key, 1G
...Force-SoA*-1'l...Control unit, 3A...
・Point register, 6B...Cursor pointer, 6
a...Work register, 6D...7 Rage register,
5D-1...range flag, 6D-2...ffM7
Rage, 6D-5...updated 7 Rage, 6E...xO register, 6F...yo register, 6G...X register, 5H...X register, 3rd...Xm1n register, 6J...・'Xm13. X register, 3K...
7m1n register, 6TJ”・7m & register,
6M...xmemo register, 6N...7memo
Register, 3Pj/6Q: Save area, 4: Execution pointer, 5: Arithmetic unit, 6A: Graph display buffer, 7: Formula buffer, 8: Display unit. Figure 3 Figure 51 Figure 6 Figure 7 CB) (C) CD)

Claims (1)

[Claims] an input means for inputting a functional formula, a storage means for storing the functional formula, a range input means for inputting range data indicating a range of a variable, a range data storage means for storing the range data, and a storage means for storing the functional formula. calculation means for sequentially determining the values of the dependent variables for the independent variables based on the range data; and means for displaying a graph of the functional formula on a display unit using the dependent variables and the independent variables determined by the means;
A small electronic calculator equipped with a graph display function, characterized in that it comprises means for displaying the range data all at once on the display section.