JPH04219858A - Small-sized electronic computer with graph display function - Google Patents

Abstract

PURPOSE:To perform tracing speedily up to an optional point by moving a pointer at optional movement intervals. CONSTITUTION:When a trace movement key 1f is operated after graph display operation, in-movement data P which is optionally set in advance is added to the X value in an X register 7f. Then the X value in the X register 7f is substituted in a function equation Y=f(X) stored in an equation storage part 8 to calculate the Y value, which is stored in a Y register 7g. Then a blinking dot is displayed as the pointer on the displayed function graph. Thus, the movement width data in a P register 7e is added to the X value through the operation of the trace movement key 1f and the pointer moves by the movement quantity at a time.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a small electronic calculator with a graph display function.

0002

2. Description of the Related Art Conventionally, compact electronic calculators with a graph display function have been developed to graph input functional formulas and display the graphs on a dot matrix type liquid crystal display panel. This type of small electronic calculator has a tracing function that causes a blinking pointer to appear on a displayed graph and also displays coordinate data indicated by the pointer. In this case, for example, by operating the "→" key, the pointer can be moved one dot at a time.

0003

[Problem to be solved by the invention] Therefore, with the conventional method, the pointer can only be moved one dot at a time, so when you want to obtain coordinate values at predetermined intervals, it takes a lot of time to move the pointer to the desired position. There was an inconvenience that it took a while. Therefore, it would be convenient if the user could arbitrarily set the movement interval of the pointer and move the pointer at once according to the set movement interval, since it would be possible to quickly trace to any point.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a small electronic calculator with a graph display function that allows the pointer to be moved at arbitrary movement intervals.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a small electronic calculator with a graph display function that graphs and displays the input functional formula Y=f(X). a numerical storage means for storing input numerical values;
Addition means for adding a stored numerical value to the X value according to the operation of a specific key, calculation means for calculating the Y value for the added X value, and display control means for blinking the points on the graph indicated by the X value and Y value. and display means for displaying at least either the X value or the Y value.

[0006]

[Operation] Therefore, according to the present invention, each time a specific key is operated, the X value is increased by the stored value, and the (X, Y) coordinates at this time are pointed to, and the pointer is moved at arbitrary intervals. be able to move.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the circuit configuration of a small electronic calculator with a graph display function to which the present invention is applied. The key input section 1 is a numerical key 1a for inputting numerical values from 0 to 9.
, Function key 1b for inputting various functions, "Graph" key 1c for specifying graph display, "Trace" key 1d for tracing function, that is, displaying a blinking pointer on the graph, and moving the pointer displayed in the trace function to the left. "←" key 1e to move the pointer to the right, and "←" key 1e to move the pointer to the right.
→” key 1f is provided, and a key input signal corresponding to the key input is output to the control unit 2.

[0008] The control unit 2 includes flag memories F0, F1, F2.
It has a built-in ROM and controls each part based on a control program stored in a ROM (not shown). A display section 3, a text display buffer 4, a graph display buffer 5, an arithmetic section 6, a RAM 7, and an equation storage section 8 are connected to the control section 2.

The display section 3 has, for example, 64 dots vertically by 96 dots horizontally.
It is a dot matrix type liquid crystal display panel configured in dots, and based on the display data output from the text display buffer 4 and the graph display buffer 5, numerical display of calculation data or function formula Y stored in the formula storage section 8 is displayed. =
A graph is displayed based on f(X).

The text display buffer 4 is a display buffer that stores character data, and the graph display buffer 5 is a display buffer that stores graph display data. The text display buffer 4 and the graph display buffer 5 each have a storage capacity for at least one screen of the display section 3, and output display data stored in each to the display section 3 based on instructions from the control section 2. do.

The calculation unit 6 executes calculation processing on the data stored in the RAM 7 or the formula storage unit 8 based on calculation instructions from the control unit 2, and sends the calculation results to the RAM 7, the text display buffer 4, and the graph display buffer 5. Output.

The RAM 7 stores various data such as input numerical data and calculation data calculated by the calculation section 6. As shown in FIG.
It includes a register 7a, an Xmax register 7b, a Ymin register 7c, a Ymax register 7d, a P register 7e, an X register 7f, and a Y register 7g.

The Xmin register 7a is a register in which range data Xmin indicating the minimum range in the X-axis direction is stored. The Xmax register 7b is a register that stores range data Xmax indicating the maximum range in the X-axis direction. The Ymin register 7c is a register that stores range data Ymin indicating the minimum range in the Y-axis direction. The Ymax register 7d is a register that stores range data Ymax indicating the maximum range in the Y-axis direction. P register 7e, X register 7f, and Y register 7
g is a trace register. Pitch data in a trace is stored in the P register 7e. The X value in the trace is stored in the X register 7f. The Y register 7g stores the X value and the Y value calculated based on the functional formula Y=f(X). The formula storage unit 8 stores the function formula Y=f(X) input through the key input unit 1 or the ROM
This is a memory in which a functional formula Y=f(X) is stored in advance.

Next, the operation of the above embodiment will be explained. Figure 2
is a flowchart showing the operation of trace processing. First, as shown in FIG. 3 (1), when the functional formula Y=X2+2X+5 for displaying a graph is input and the "Graph" key 1c is operated, the inputted functional formula is graphed and displayed on the display section 3. be done. That is, the input function formula is stored in the formula storage unit 8, and based on the contents of the formula storage unit 8, the Y value for the X value is sequentially calculated in the calculation unit 6, and the coordinates of (X, Y) are displayed in a graph. The graph is plotted in buffer 5 to complete the graph.

Next, when the "trace" key 1d is operated, the trace processing shown in FIG. 2 is started. Step S
In step 1, it is determined what the input key is. In this step S1, if the "trace" key 1d is pressed, the process advances to step S2, if the numeric key 1a is used to input a number, the process goes to step S4, and if the "→" key 1f is pressed, the process goes to step S7.

As shown in FIG. 3(2), when the "trace" key 1d is operated, steps S1 to S
Proceed to step 2. In step S2, "1" is stored in the flag memory F0.
” to set the trace mode. Step S
In step 3, "0" is written into the flag memory F1 and the flag memory F2 to initialize them, and the process of FIG. 2 is completed.

Next, use the numerical key 1a to input the numerical data “2”.
” is input, the process advances from step S1 to step S4. In step S4, it is determined whether the mode is trace mode or not, that is, whether the content of the flag memory F0 is "1". If YES in step S4, proceed to step S5, and
In the case of O, the process proceeds to other processing not shown. Now, “F0=1
'' trace mode, the answer is YES and the process advances to step S5. In step S5, numeric data "2" is written into the P register 7e. That is, the numeric data "2" is set as the movement width data P. In the next step S6, "1" is written in the flag memory F1, and as shown in FIG.
Terminates the process.

[0018] Then, when the "→" key 1f is operated,
The process advances from step S1 to step S7. In step S7, similarly to step S4, it is determined whether the mode is trace mode. If YES in step S7, the process proceeds to step S8; if NO, the process proceeds to other processes not shown. Since we are currently in trace mode, the answer is YES and the process advances to step S8. In step S8, it is determined whether the content of the flag memory F2 is "1". Flag memory F2 is “→
” is used to memorize the operation of key 1f. Now, “F2=
0'', the determination is NO and the process proceeds to step S9.

In step S9, it is determined whether the content of the flag memory F1 is "1". The flag memory F1 stores the presence of a set number, that is, the presence of a pitch setting. If it is determined NO in step S9, there is no pitch setting, so proceed to step S10 and set the pitch of one dot to
It is calculated from max and Xmin and written to the P register 7e. Since "F1=1" now, the determination is YES and the process proceeds to step S11.

In step S11, the flag memory F
"1" is written in 2, and the operation of the "→" key 1f is stored. In the next step S12, Xmin of RAM7
Minimum X range data Xmin stored in register 7a
(in this case, "-5") is written to the X register 7f as the X value. From step S12, step S
Proceed to step 14.

In step S14, the X value stored in the X register 7f is substituted into the function formula Y=X2+2X+5 stored in the formula storage unit 8, and the Y value is calculated.
is memorized. In the next step S15, FIG.
As shown in 2), based on the X value stored in the X register 7f and the Y value stored in the Y register 7g, a pointer is displayed with blinking dots on the displayed graph, and the X, Y The value "X=-5 Y=20" is displayed on the bottom line of the display section 3. After executing step S15, the process in FIG. 2 ends.

Further, as shown in FIG. 3(3), when the "→" key 1f is operated again, steps S1, S7, and S8 are proceeded to, and in step S8, since "F2=1", the answer is YES, and the process proceeds to step S13. Proceed to. In step S13, the movement width data "2" stored in the P register 7e is added to the contents of the X register 7f, and the addition result is written into the X register 7f. That is, the X value changes at one time by the movement width data "2".

In the following step S14, the X value "-3" of the X register 7f is substituted into the function formula Y=X2+2X+5 stored in the formula storage unit 8 in the same manner as described above, and the Y value is calculated. The value "8" is stored in the Y register 7g.

In step S15, as shown in FIG. 3(3), the X value of the X register 7f and the Y value of the Y register 7
Based on the Y value of g, the functional formula Y= displayed on the display unit 3
A blinking dot pointer is displayed on the X2+2X+5 graph. At the same time, the X and Y values “X=-3 Y
=8” is displayed on the bottom line of the display section 3.

In this way, in response to the operation of the "→" key 1f, the movement width data "2" of the P register 7e is added to the X value, and the pointer moves at once by the movement width. Therefore,
By setting arbitrary movement width data in the P register 7e, the movement width (movement interval) of the pointer can be specified arbitrarily.

In the above embodiment, only the trace processing by operating the "→" key 1f was shown, but the "←" key 1e
The same thing applies when you operate . When the "←" key 1e is operated, for example, in the step corresponding to step S13, "X←X-P" processing is performed, but in other steps, the same processing as the "→" key 1f is performed. That is, when the "←" key 1e is operated, the movement width data P is subtracted from the X value of the X register 7f, and the pointer moves to the left at once by the movement width.

[0027]

As described in detail above, according to the present invention, since the pointer can be moved at any preset movement interval, it is possible to quickly trace to any point.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a circuit configuration.

FIG. 2 is a flowchart showing the operation.

FIG. 3 is a diagram showing a display state.

[Explanation of symbols]

1...Key input section 2...Control unit 3...Display section 4...Text display buffer 5...Graph display buffer 6... Arithmetic section 7...RAM 8...Formula storage section

Claims (1)

[Claims] Claim 1: A small electronic calculator with a graph display function for displaying an inputted functional formula Y=f(X) in a graph, comprising a numerical value storage means for storing numerical values inputted by a key, and a numerical value storage means for storing a numerical value inputted by a key; Adding means for adding the stored numerical value to the X value according to the operation, calculation means for calculating the Y value for the added X value, display control means for blinking the points on the graph indicated by the X value and the Y value, and at least 1. A small electronic calculator with a graph display function, characterized by comprising display means for displaying either an X value or a Y value.