JPH10222471A - Device, method for plotting graph and recording medium recording graph plotting processing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily display a graph in various forms by freely designating any arbitrary variable in an inputted equation as a graph parameter concerning an electronic calculation system for performing function calculating processing, for example. SOLUTION: Any arbitrary equation 'AB=C+D' is inputted by selectively operating a data input key 12a and in the state of storing this equation in an input formula register, 'A=X', 'B=X', 'C=Y' and 'D=6' are substituted to respective variables included in this input formula and respectively stored in a variable value register, for example. When a 'SOLVE' key 12d is operated, two variables 'AB' in this input equation are collected into one variable 'X' and the equation is converted to a function formula 'X=Y+6' turning the variable 'C' to the variable 'Y' and stored in a converted formula register. Then, graph data with the variable 'A' as an X axis and the variable 'C' as a Y axis is plotted in a graph data register and displayed on a liquid crystal display part 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, an electronic computer for performing a function calculation, a calculation data processing method,
And a recording medium on which a calculation data processing program is recorded.

[0002]

2. Description of the Related Art Conventionally, in an electronic computer having a function calculation function, a function expression of y = f (x) is input, and for example, a numerical value is substituted for one of the variables x, and the other variable y is substituted for the other. By instructing the calculation of the solution (SOLVE) by designating, the function of calculating the solution of the specified variable y according to the function formula into which the numerical value is substituted (here, “SOVE”)
LVE function ”).

That is, for example, when the equation “y = 2x” is input, “2” is substituted for the variable x, and the variable y is specified and the “SOLVE” key is operated, the solution “y = 4” is obtained. Is calculated and displayed.

Further, for example, an equation including a plurality of variables is input, and arbitrary variables among them are designated as X and Y, and “SO
When the "LVE" key is operated, the Y value with respect to the change in the X value is calculated according to the numerical values substituted as other variable values, and the graph data corresponding to the XY coordinates is drawn and displayed.

[0005]

However, in the above-mentioned conventional electronic computer, when an arbitrary variable in an input equation is designated as X and Y and a graph is displayed by the "SOLVE function", X or Since only one variable is specified as Y, a plurality of variables are displayed as one coordinate variable in a graph, for example, a graph is displayed in which the entire right side including a plurality of variables of the input equation is specified as X. Can not.

For this reason, there is a problem that the form of drawing the input equation as a graph is limited. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems. An electronic device that can easily specify various variables in an input equation as graph variables and easily perform various forms of graph display. It is an object to provide a calculation device, a calculation data processing method, and a recording medium on which a calculation data processing program is recorded.

[0007]

That is, a graph display device according to claim 1 of the present invention stores an expression inputting means for inputting an expression including a plurality of variables and an expression input by the expression inputting means. Expression storage means, numerical value substitution means for substituting a numerical value for an arbitrary variable included in the expression stored in the expression storage means, and variable specification for specifying an arbitrary variable included in the expression stored in the expression storage means Means, and the variable designated by the variable designation means is used as the axis of the graph, and the graph data is drawn based on the mathematical expression stored in the expression storage means and the numerical value substituted into the variable in the mathematical expression by the numerical value substitution means. And a graph drawing means.

That is, in the electronic computing device according to the first aspect of the present invention, a numerical value is substituted for an arbitrary variable included in the mathematical expression stored in the expression storing means, and is included in the mathematical expression stored in the expression storing means. When an arbitrary variable is designated, the designated variable is used as the axis of the graph, and the graph data is drawn based on the mathematical expression stored in the expression storage means and the numerical value assigned to the variable in the mathematical expression. A graph in a desired form can be drawn using any variable in the graph as an axis of the graph.

According to a second aspect of the present invention, there is provided an electronic computer according to the first aspect, wherein:
The variable designating means is a variable designating means for designating any one or more variables included in the mathematical expression stored in the formula storing means as one variable, and the graph drawing means is configured as one variable by the variable designating means. A graph drawing unit that draws graph data based on a mathematical expression stored in the expression storage unit and a numerical value substituted into the variable in the mathematical expression by the numerical value substitution unit, using a variable designated as a variable as an axis of one graph. It is characterized by having.

That is, in the electronic computing device according to the second aspect of the present invention, a numerical value is substituted for an arbitrary variable included in the mathematical expression stored in the expression storing means, and is included in the mathematical expression stored in the expression storing means. When any one or more variables are designated as one variable, one or more variables designated as one variable are set as axes of one graph, and the mathematical expression stored in the expression storage means and the mathematical expression Since the graph data is drawn based on the numerical values assigned to the variables, the graph in which a plurality of variables in the mathematical expression are set as one axis of the graph can be drawn.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an electronic circuit of the electronic computing device according to the embodiment of the present invention.

This electronic computing device includes a control unit (CPU) 11 composed of a computer or the like. Control unit (CP
U) 11, the recording medium reading unit 17 reads a system program stored in the ROM 13 in advance or a computer control program stored in the external recording medium 18 in advance in response to a key operation signal from the key input unit 12. The RAM 14 is used as a work memory to control the operation of each part of the circuit.

The control unit (CPU) 11 includes the key input unit 12, the ROM 13, the recording medium reading unit 17,
The AM 14 is connected, and the liquid crystal display unit 16 is connected via the display drive circuit 15.

The key input unit 12 is provided with data input keys 12a comprising various numeric / symbol key groups such as numeric keys, operator keys, function keys, etc., and a SOLVE operation corresponding to an arbitrary input equation. SOL to process
When displaying a menu screen of various operation modes such as a VE mode, a matrix mode for performing a matrix operation corresponding to an arbitrarily input determinant, and a program mode for performing an arithmetic control process corresponding to arbitrarily input program data. Key 12b to be operated, an "execute" key 12c to be used for instructing setting of selected data and execution of calculation, and SOLVE for input equations.
"SOLV" operated when instructing the start of arithmetic processing
The "E" key 12d, the "trace" key 12e operated when pointing an arbitrary point on the graph displayed in the SOLVE mode processing with the pointer P, and the display state of the input formula data and the corresponding graph data. A “G ← → T” key 12f operated when switching, a “↑” cursor key 12g, a “↓” cursor key 12 operated when moving a cursor on the display screen or selecting data.
h, "←" cursor key 12i, "→" cursor key 1
2j and the like.

The ROM 13 stores in advance system program data for controlling the entire processing in the electronic circuit of the present electronic computer, and also stores the SOLV shown in FIGS.
Control program data, which is subprogram data for controlling various operation modes such as E-mode processing, is also stored in advance.

The RAM 14 stores a mode data register M in which mode data indicating the currently set operation mode is stored.
6, a display register 14a in which display data to be displayed is developed and stored as bitmap pattern data;
Substitution value A for each variable included in the input expression data,
Variable value registers 20a, 20 storing B, C,.
.., 20c,..., an input expression register 21 in which the input expression data is stored. An arbitrary variable in the expression data input in the SOLVE mode processing is represented by a graph variable X or Y.
The conversion formula register 22 in which the formula data obtained by converting the specified variable into X or Y when specified is stored, the input formula register 21 and the graph data corresponding to the formula data stored in the conversion formula register 22 are bitmap data. And a work area 2 for temporarily storing data input / output by the control unit (CPU) 11 in accordance with control processing of various operation modes.
4 etc. are provided.

Next, the operation of the electronic computer having the above configuration will be described. FIG. 2 is a flowchart showing the overall processing of the electronic computer. When the "menu" key 12b of the key input unit 12 is operated, a mode selection screen [see FIG. 5A] in which a mode menu for selecting and setting an operation mode such as a SOLVE mode, a matrix mode, and a program mode is displayed. It is displayed on the display unit 16 (step S1 → S2).

In the display state of the mode selection screen,
When an arbitrary mode menu is selected by moving the cursor and operating the "execute" key 12c, mode data indicating the selected and specified operation mode is stored and set in the mode data register M in the RAM 14, and the set operation mode is set. Is started and the initial display screen is displayed (steps S3 → S4, S5 → S
6, S7).

Such mode selection setting processing (step S)
1 to S7), when the SOLVE mode is selected and set, an initial display screen for inputting an equation [FIG.
(B) is displayed on the liquid crystal display section 16 and SOLVE
The mode process is started (step S8 → SA).

When the program mode is selected and set by the mode selection setting process (steps S1 to S7), an initial display screen for inputting program data is displayed on the liquid crystal display section 16, and the program mode is set. The process is started (steps S9 → S10).

When the matrix mode is selected and set by the mode selection setting process (steps S1 to S7), an initial display screen for inputting a determinant is displayed on the liquid crystal display unit 16, and the matrix mode processing is performed. Is started (steps S11 → S12).

When another operation mode is selected and set by the mode selection setting process (steps S1 to S7), the initial display screen is displayed on the liquid crystal display unit 16, and the corresponding operation mode is set. The processing is started (step S11 → other processing).

FIG. 3 shows the SOLV in the electronic computer.
9 is a flowchart illustrating E-mode processing (1).
FIG. 4 is a flowchart showing SOLVE mode processing (part 2) in the electronic computer.

FIG. 5 is a diagram showing an operation of calculating and displaying an unassigned variable value (designated variable value) of an input equation accompanying the SOLVE mode processing of the electronic computer. As shown in FIG. 5A, by operating the “menu” key 12b of the key input unit 12, a mode menu selection screen is displayed on the liquid crystal display unit 16 (steps S1 → S2).
By operating the cursor keys 12g to 12j, the menu icon "SOLVE" is selected and highlighted (steps S3 → S4). As shown in FIG. 5B, when the "execute" key 12c is operated, the CPU (control) The operation mode of the unit 11 is set to the SOLVE mode, the SOLVE mode processing is started, and an initial screen is displayed for inputting and displaying an arbitrary equation (steps S5 → S6, S7, S8 → S).
A).

In the input display screen of this equation, FIG.
As shown in (C), by selecting and operating the data input key 12a of the key input unit 12, for example, an arbitrary equation "AB = C
+ D ”, the input expression data“ AB = C +
D ”is stored in the input register 21 in the RAM 14 and written into the display register 19, and the liquid crystal display 1
6 (steps A1 → A2, A3).

As shown in FIG. 5D, when the "execute" key 12c is operated, the equation data "AB = C + D" is stored in the input equation register 21 in the RAM 14, so that the equation input is performed. It is determined that there is, and the input expression “A
B = C + D ”(in this case,“ A ”
“B”, “C”, “D”) are detected (step A4 → A)
5, A6).

Then, the variables "A", "B", "C" and "D" detected in step A6 are stored in the variable value registers "A" 20a, "B" 20b and "C" 2 in the RAM 14.
0c and "D" 20d, and the respective variable names are displayed on the liquid crystal display unit 16 as a variable value substitution screen (steps A7 and A8).

In the display state of the variable value substitution screen,
As shown in FIG. 5 (E), the numeric key of the data input key 12a and the “↓” cursor key 12h are alternately operated to
Numerical values corresponding to arbitrary variables are represented by, for example, “A = 2”, “B =
3 "and" D = 4 "are input and displayed while moving the cursor, and the substitution values corresponding to the respective variables are stored in the corresponding variable value registers" A "20a and" B "20 in the RAM 14.
b, stored in “D” 20d (step A9 → A1)
0, steps A25 → A26 → A29).

Thus, the input equation “AB =
In order to obtain the value of the variable “C” in a state where only the numerical value corresponding to the variable “C” among the variables “A”, “B”, “C”, and “D” included in “C + D” is unassigned, As shown in FIG. 5 (F), when the "SOLVE" key 12d is operated,
It is determined that the substitution data has been input to the variable value registers 20a, 20b,... In the RAM 14, and "X" data and "Y" data substituted as graph variables are detected from the substitution data (step). A11 → A12 →
A13).

In this case, it is determined that the graph variables "X" and "Y" do not exist in the substitution data set in the variable value registers 20a, 20b,. For the stored equation "AB = C + D", the variable value register 20
a, 20b,..., "A = 2", "B"
= 3 ”and“ D = 4 ”, the value of the unassigned variable“ C ”(or the value of the variable designated by the cursor) is calculated and calculated,
The result is displayed on the liquid crystal display unit 16 as “C = 2” (step A14 → A15).

FIG. 6 is a diagram showing an operation of displaying a graph of an input equation accompanying the SOLVE mode processing of the electronic computer. If the graph data is being displayed when the “G ← → T” key 12 f of the key input unit 12 is operated, the expression data stored in the input expression register 21 is displayed instead of the graph data. And a variable value substitution screen for the expression data is displayed (steps A30 → A31).
→ A32).

When the "G.fwdarw.T" key 12f is operated, if the equation data is being displayed and the graph data is not being displayed, the graph data is drawn and stored in the graph data register 23. Then, if it is determined that the image data has been drawn and stored, the stored graph data is displayed instead of the expression data (steps A30 → A31 → A33 → A34).

If, when the "G.fwdarw.T" key 12f is operated, it is determined that the graph is not being displayed and the graph data register 23 does not store the drawing of the graph data, the input is performed. The expression data stored in the expression register 21 is displayed, and a variable value substitution screen for the expression data is displayed (steps A30 → A31).
→ A33 → A32).

That is, as shown in FIG. 5F, the variable “A = 2” for the equation “AB = C + D”
In the state where the result is displayed as the variable “C = 2” based on “B = 3” and “D = 4”, as shown in FIG. 6A, the “G ← → T” key 12f of the key input unit 12 Is operated, it is determined that the graph is not being displayed and the graph data is not stored in the graph data register 23, and the expression data “AB =
C + D ”is displayed, and a variable value substitution screen for the expression data is displayed (steps A30 → A31 → A3).
3 → A32).

In this case, as the respective variable values on the variable value substitution screen, the respective substitution values stored in the variable value registers 20a, 20b,... Are initially displayed. Here, the data input key 12a and the “↓” cursor key 12h are operated to substitute and display the variables “A = X”, “B = 2”, “C = Y”, and “D = 6” while moving the cursor ( Step A9 →
A10, steps A25 → A26 → A29), FIG.
As shown in (B), when the "SOLVE" key 12d is operated, it is determined that substitution data has been input to the variable value registers 20a, 20b,... And "X" and "Y" data as graph variables are detected. It is determined that there is one X data and one Y data (steps A11 → A12 → A13, A14 → A16 →
A17).

Then, graph data with the variable “A” as the X axis and the variable “C” as the Y axis is calculated and calculated, and the graph data is converted into the graph data according to the range data automatically set according to the graph data. The data is drawn in the register 23 and the input expression “AB = C +
D ”and variable substitution values“ A = X ”,“ B = 2 ”,“ C = Y ”
Displayed together with “D = 6” (Step A17 → A1)
8).

Here, as shown in FIG. 6C, when the "trace" key 12e of the key input section 12 is operated, it is determined that the graph is being displayed, and the graph displayed on the liquid crystal display section 16 is displayed. The pointer P is displayed on the graph corresponding to the minimum X value of the data, and the coordinate data corresponding to the display point of the pointer P is calculated and displayed (steps A21 → A22 → A23, A24).

When it is determined that the pointer P is being displayed by operating the "→" cursor key 12j, the pointer P on the graph is moved and displayed in a direction corresponding to the cursor operation. The coordinate data corresponding to the moving display point of the pointer P is, for example, “A = 0”, “C
= −6 ”(Step A25 → A2)
6 → A27, A28).

On the other hand, as shown in FIG.
By operating the “G ← → T” key 12 f of the key input unit 12, the variable value substitution screen is displayed together with the expression data “AB = C + D” stored in the input expression register 21 (step A 30). → A31 → A32), by selecting and operating the data input key 12a and the “↓” cursor key 12h, the variables “A = X”, “B = X”, “C =
The substitution display is performed while moving the cursor to “Y” and “D = 6” (steps A9 → A10, A25 → A26 → A29).

Then, as shown in FIG.
When the "LVE" key 12d is operated, the variable value register 20
a, 20b, ..., substitution data "A = X", "B = X", "C
= Y "and" D = 6 "are input, and" X "and" Y "data as graph variables are detected, and it is determined that the number of X data contained therein is not two but two. (Steps A11 → A12 → A13, A14 → A1
6).

Then, the input equation "AB = C + D"
Is converted into a function formula “X = Y + 6” in which the variable “A” and the variable “B” associated with the graph variable “X” are combined as one variable “X”, and stored in the conversion formula register 22. (Step A16 → A19).

At the same time, it is determined that there is one Y data as a graph variable included in the substitution data for each variable (step A17). Then, the input expression “AB = C +” stored in the input expression register 21
D ”and the function expression“ X =
On the basis of “Y + 6”, graph data with the variable “AB” as the X axis and the variable “C” as the Y axis is calculated and calculated, and the graph data is converted into the graph data according to the range data automatically set according to the graph data. The data is drawn in the register 23 and the input expression “AB = C +
D ”and variable substitution values“ A = X ”,“ B = X ”,“ C = Y ”
Displayed together with “D = 6” (Step A17 → A1)
8).

When the "trace" key 12e of the key input unit 12 is operated as shown in FIG. 6 (F), it is determined that a graph is being displayed, and the graph displayed on the liquid crystal display unit 16 is displayed. The pointer P is displayed on the graph corresponding to the minimum X value of the data, and the coordinate data corresponding to the display point of the pointer P is calculated and displayed (steps A21 → A22 → A23, A24).

When it is determined that the pointer P is being displayed by operating the "→" cursor key 12j, the pointer P on the graph is moved and displayed in a direction corresponding to the cursor operation. The coordinate data corresponding to the moving display point of the pointer P is, for example, "AB = 6".
It is calculated and displayed as "C = 0" (step A25 → A
26 → A27, A28).

On the other hand, for example, when the graph variable “Y” is substituted for two or more variables out of the plurality of variables included in the input expression, the plurality of variables associated with the graph variable “Y” Is converted into a function expression in which the variables are combined as one variable “Y”, and stored in the conversion expression register 22 (steps A17 → A20).

Then, based on the function formula stored in the conversion formula register 22, graph data having each variable substituted as X data as an X axis and each variable substituted as Y data as a Y axis is calculated. At the same time, the graph data is drawn in the graph data register 23 according to the range data automatically set in accordance with the graph data, and is displayed on the liquid crystal display unit 16 together with the input expression and each variable substitution value (step A18). .

Therefore, according to the electronic computing device having the above-described configuration, the user operates the data input key 12a of the key input section 12 to input an arbitrary equation "AB = C + D", and the RAM 1
4 is stored in the input expression register 21 and, for each variable included in the input expression, for example, “A = X”, “B”
= X ”,“ C = Y ”, and“ D = 6 ”and store them in the variable value registers 20a to 20d, respectively, and when the“ SOLVE ”key 12d is operated, the two variables“ AB ”in the input equation become one variable The variable “C” is converted into a function formula “X = Y + 6” in which the variable “C” is changed to the variable “Y” and stored in the conversion formula register 22. The variable “AB” is the X axis, and the variable “C” is the Since the graph data for the Y axis is drawn in the graph data register 23 and displayed on the liquid crystal display unit 16, the number of variables designated as “X” or “Y” of the graph variable is not limited to one, and for example, input A plurality of variables can be displayed as one coordinate variable in a graph, for example, by displaying a graph in which the entire left side including a plurality of variables of the equation is designated as “X”, and the input equation can be easily converted into various forms. It will be able to draw display as rough.

The method described in the above embodiment, that is, the entire processing of the electronic computer shown in the flowchart of FIG. 2, and the SOL shown in the flowcharts of FIGS.
Each method such as the VE mode processing is executed by a memory card (RO) as a program that can be executed by a computer.
M card, RAM card, etc.), magnetic disk (floppy disk, hard disk, etc.), optical disk (CD-
External recording medium 1 such as ROM, DVD, and semiconductor memory
8 and can be distributed. Then, the computer reads the program recorded on the external recording medium 18 by the recording medium reading unit 17, and controls the operation by the read program, thereby realizing each function described in the above embodiment. A similar process can be executed by the method described above.

[0049]

As described above, according to the electronic computer according to the first aspect of the present invention, a numerical value is substituted for an arbitrary variable included in the mathematical expression stored in the expression storage means, and the expression is stored in the expression storage means. If you specify any variable in the stored formula,
The designated variable is used as the axis of the graph, and the graph data is drawn based on the mathematical expression stored in the expression storage means and the numerical value assigned to the variable in the mathematical expression. A graph in a desired form can be drawn as an axis.

Further, according to the electronic computing device of the second aspect of the present invention, a numerical value is substituted for an arbitrary variable included in the mathematical expression stored in the expression storing means, and When any one or more variables included are specified as one variable, one or more variables specified as one variable are set as axes of one graph, and the mathematical expression stored in the expression storage means and the Since the graph data is drawn based on the numerical values assigned to the variables in the formula, for example, a graph in which a plurality of variables in the formula are set as one axis of the graph can be drawn. Therefore, it is possible to freely designate any variable in the input equation as a graph variable and easily perform various forms of graph display.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an electronic circuit of an electronic computing device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the overall processing of the electronic computer.

FIG. 3 is a flowchart showing SOLVE mode processing (part 1) in the electronic computer.

FIG. 4 is a flowchart showing SOLVE mode processing (part 2) in the electronic computer.

FIG. 5 is a view showing an operation of calculating and displaying an unassigned variable value (designated variable value) of an input equation accompanying the SOLVE mode processing of the electronic computer.

FIG. 6 is an exemplary view showing a graph display operation of an input equation accompanying the SOLVE mode processing of the electronic computer.

[Explanation of symbols]

 12d: "SOLVE" key, 12e: "Trace" key, 12f: "G ← → T" key, 12g to 12j: Cursor keys, 13: ROM, 14: RAM, 20a to 20d: Variable register, 21: Input expression Register, 22: conversion formula register, 23: graph data register, M: mode data register, P: pointer.

Claims (4)

[Claims] An expression input means for inputting an expression including a plurality of variables, an expression storage means for storing an expression input by the expression input means, and an arbitrary expression included in the expression stored in the expression storage means A numerical value substituting unit for substituting a numerical value into a variable; a variable specifying unit that specifies an arbitrary variable included in the mathematical expression stored in the expression storing unit; and a variable specified by the variable specifying unit as an axis of a graph, A graph drawing device, comprising: a graph drawing unit that draws graph data based on a mathematical expression stored in a formula storing unit and a numerical value substituted into a variable in the mathematical expression by the numerical value substituting unit. 2. The variable designating means is a variable designating means for designating any two or more variables included in a mathematical expression stored in the formula storing means as one variable. A variable designated as one variable by the variable designating unit is set as an axis of one graph, and graph data is stored based on the mathematical expression stored in the expression storing unit and the numerical value substituted for the variable in the mathematical expression by the numerical value substituting unit. 2. The graph drawing device according to claim 1, wherein the drawing unit is a graph drawing unit that draws a graph. 3. An expression input step of inputting an expression including a plurality of variables, an expression storage step of storing the expression input by the expression input step, and an arbitrary expression included in the expression stored by the expression storage step A numerical value substituting step of substituting a numerical value into a variable; a variable specifying step of specifying an arbitrary variable included in the mathematical expression stored in the expression storing step; and a variable specified by the variable specifying step as an axis of a graph, A graph drawing processing method, comprising: a graph drawing step of drawing graph data based on a mathematical expression stored in an expression storing step and a numerical value substituted into a variable in the mathematical expression by the numerical value substituting step. 4. A computer, comprising: a formula storing means for storing, when a formula including a plurality of variables is inputted, a numerical value for an arbitrary variable included in the formula stored in the formula storing means; Numerical substitution means for substituting, Variable designation means for designating any variable included in the mathematical expression stored in the expression storage means, The variable designated by this variable designation means is used as the axis of the graph and stored in the expression storage means And a graph drawing processing program for functioning as a graph drawing means for drawing the graph data based on the mathematical formula and the numerical value substituted into the variable in the mathematical formula by the numerical value substituting means.