JPH09185586A - Graph display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a graph display device simultaneously displaying plural dynamic graphs so as to compare them on a screen. SOLUTION: Functional expression data of a dynamic graph is inputted by depressing an ST key 14. A scale is input-displayed by depressing a scale key 13, and one or two pieces of variable data of the functional expression of two dynamic graphs are inputted to set the range of the variable data. The functional expression and the scale like these are stored respectively in a Y1 graph form register 18, Y2 graph form register 19 and a variable scale 20. As CPU 7 calculates based on the functional expression and the variable scales of plural dynamic graphs to display the plural dynamic graphs on the same screen, the movement of the graphs are easily compared.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graph display device, and more particularly, to a graph for displaying a graph of functional expression data corresponding to each value by changing variable data of functional expression data including variable data. Regarding display device.

[0002]

2. Description of the Related Art As a conventional graph display device, for example, a data input section for inputting a functional expression or a numerical value, a calculation section, and an LCD (Liquid Crystal Disp) for displaying the calculation result.
There is a scientific calculator equipped with a display such as play) and displays a dynamic graph.

The dynamic graph is to understand the change of the function graph by preparing a plurality of graph screens in which the value of one variable in the function expression is changed and switching and displaying the plurality of graph screens. It is easy to show.

Therefore, in the case of displaying a dynamic graph using a conventional scientific calculator, a desired function formula is input from the data input unit, and the value of one variable in the function formula is changed, and the calculation unit is operated. The graphs that are calculated and drawn according to the calculation results are sequentially displayed on the display.

[0005]

However, in such a conventional graph display device, a plurality of graph screens are prepared and the screens are continuously switched to display one function graph. Even if you can
Since it is not possible to simultaneously display a plurality of graphs in which the values of variables in a plurality of function expressions are changed, there is a problem that the movements of a plurality of function graphs and their relations cannot be seen on the same screen.

An object of the present invention is to provide a graph display device capable of displaying a plurality of dynamic graphs composed of different function formula data on the same screen for comparison.

[0007]

According to a first aspect of the present invention, there is provided a graph display device, wherein a function formula data input means for inputting a plurality of different function formula data including variable data, and the function formula data input means. Variable data range setting means for setting a range of values to be substituted into respective variable data of a plurality of function formula data, and a value within the range set by the variable data range setting means is substituted into each variable data, A graph drawing means for drawing a graph of a plurality of function expression data corresponding to respective values, and a display means for displaying a graph of a plurality of function expression data drawn by the graph drawing means on the same screen are provided. It is characterized by

That is, a plurality of different function formula data including variable data is inputted by the function formula data input means,
A range of values to be assigned to each variable data of a plurality of function formula data is set by the variable data range setting means, a value within the set range is assigned to each variable data, and a graph of a plurality of function formula data Is drawn by the graph drawing means, and a graph of a plurality of function formula data is displayed on the display means of the same screen. Therefore, a graph of a plurality of different function formula data including variable data can be displayed on the same screen.

In the graph display device according to the present invention, the display means may be provided with display control means for sequentially switching and displaying a plurality of graphs for each of the plurality of function formula data drawn by the graph drawing means. Good.

That is, the display means is provided with display control means for sequentially switching and displaying a plurality of graphs for each of a plurality of function formula data drawn by the graph drawing means. Therefore,
By sequentially switching a plurality of function formula data by the display control means provided in the display means and displaying various combinations, it is possible to visually grasp the relationship of the graphs between the function formulas.

In the graph display device according to the third aspect, variable data included in a plurality of different function formula data may be common variable data. Therefore, the movements of a plurality of graphs can be seen by changing a plurality of function formula data into one variable data.

In the graph display device according to the fourth aspect, the variable data included in the plurality of different function formula data may be different variable data for each function formula data. Therefore, it is possible to see the movements of a plurality of graphs by changing a plurality of function formula data and a plurality of variable data.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 9 are views for explaining a graph display device of the present invention. In the present embodiment, a plurality of dynamic graphs can be displayed on the same screen by using a scientific calculator capable of displaying a graph. It is a thing. First, the configuration will be described. FIG. 1 is a block diagram of a main part of a scientific calculator 1 according to this embodiment. The scientific calculator 1 of FIG. 1 includes a display unit 2, a display drive circuit 3, an input unit 4, and a ROM.
5, a storage unit (RAM) 6, a CPU 7, and the like.

The display unit 2 displays input data input from the input unit 4, operation information such as menus, and a dynamic graph. Here, an LCD is used.
(Liquid Crystal Display) is used and the display is driven by the display drive circuit 3.

The input section 4 includes a menu key 11 for selecting various functions in the scientific calculator 1, a dynamic key 12 for displaying a dynamic graph, and a scale key 13 for inputting variable data of a dynamic graph function formula. , Set to set the input data (S
The T) key 14 and a numeral / data input key 15 for inputting a numeral or data are provided, and a signal corresponding to each key operation is output to the CPU 7. ROM (Read Only Me)
The mory) 5 stores various control programs executed by the CPU 7, and various data processed when the various control programs are executed.

Storage unit (RAM: Random Access Memory)
Reference numeral 6 denotes, for example, as shown in FIG. 1, a display register 16 for temporarily storing display data to be displayed on the display unit 2, a menu register 17 for storing menu data, and a Y1 graph for storing the graph formula of the dynamic graph Y1. Expression register 18, Y2 graph expression register 19 for storing the graph expression of dynamic graph Y2, variable scale register 20 for storing the range of variable data included in the function expression data of each dynamic graph, and graph data for a plurality of dynamic graphs And a work area 22 for temporarily storing data for processing and processing data, and for storing various parameters.

CPU (Central Processing Unit) 7
Controls each unit in the scientific calculator 1 according to various control programs stored in the ROM 5. For example, CPU
Reference numeral 7 denotes a display drive circuit 3 for displaying input data or display data input by various key operations of the input unit 4 to display it on the display unit 2, or a Y1 graph type register 18 or a Y2 graph type register of the storage unit 6. The desired function formula data is stored in 19, and the range of variable data that determines the scale of the dynamic graph is set in the variable scale register 20. Further, the CPU 7 calculates the graph data of the dynamic graphs of Y1 and Y2 based on the functional expressions stored in the Y1 graph type register 18 and the Y2 graph type register 19 and stores them in the graph storage register 21. When a plurality of dynamic graphs are displayed together, the CPU 7 synthesizes the dynamic graph data of Y1 and Y2 stored in the graph storage register 21 and stores them in the display register 18, and then the display drive circuit 3
To display on the display unit 2.

Next, the operation of this embodiment will be described with reference to FIGS. FIG. 2 is a scientific calculator 1 according to the present embodiment.
5 is a flowchart illustrating a main routine process of FIG. First, in step S1 of FIG. 2, it is determined whether or not the menu key 11 of the input unit 4 of FIG.
When the menu key 11 is pressed, the CPU 7 reads the menu data stored in the menu register 20 in the storage unit 6, and the display unit 2 via the display register 18.
Menu display processing is performed to display the menu at step S2.

After the return, if the menu key 11 is not pressed again in step S1, the process proceeds to NO and it is determined in step S11 whether or not the menu selection display is currently being performed. If YES, the menu is selected. Selection processing is performed (step S12). In this menu selection processing, for example, the operator selects a desired menu from the menus on the screen by using the number / data input key 17 or the like.

Next, when designating the selected menu, it is judged whether or not the menu designating key is depressed (step S13), and when it is depressed, a process for setting the designated menu is performed. After (step S1
4) Further, if the button is not pressed, the process is returned as it is.

Then, again returning to step S1, NO is selected, and when the menu selection display is not currently performed, NO is selected in step S11 and step S11 is selected.
At 21, it is determined whether the dynamic graph mode is set.
Here, if the dynamic graph mode is not set, NO
Is selected and other mode processing is performed, but if the dynamic graph mode is currently set, dynamic graph processing for displaying a plurality of dynamic graphs, which is a feature of the present embodiment, is performed (step S22).

FIG. 3 is a flow chart for explaining the operation of the subroutine relating to the dynamic graph processing of FIG. 2, FIG. 4 is a diagram showing an example of data input display in the dynamic graph processing of FIG. 3, and FIG. FIG. 7 is a diagram showing an example in which two dynamic graphs made up of different function formula data having the same variable data shown in FIG. 4 are displayed while being changed, and FIG.
FIG. 7 is a diagram showing an input example of two function formula data, and FIG. 7 is a diagram showing an example in which two dynamic graphs made up of two function formula data each including different variable data shown in FIG. 6 are displayed while being changed. . FIG. 8 is a diagram showing an input example of two function formula data composed of different function formula data having common variable data, and FIG. 9 shows two dynamic graphs composed of the two function formula data inputted in FIG. It is a figure which shows the example displayed while changing.

First, when the numeral / data input key 17 is pressed, in order to input data, step S31 in FIG.
Then, it is determined whether the number input / data input key 17 of the input unit 4 in FIG. 1 is pressed, and the process proceeds to step S32 to display the input data.

After the return, step S31 is executed again.
If it is not determined that the numeral / data input key 17 is pressed down, the process proceeds to NO and is set in step S33 (S
It is determined whether or not the T) key 14 is pressed. Set key 1
If 4 is pressed, it is determined whether or not the input display of the function formula is performed (step S34), and when it is determined that the input display of the function formula is performed (for example, FIG. 4A, FIG. a),
And displayed on the display unit 2 in a state as shown in FIG. ), The CPU 7 stores the input plurality of function formula data in the graph formula registers 18 and 19 of Y1 and Y2, respectively (step S35), and returns.

For example, in the case of FIG. 4 (a), "Y1 = a
x +1 "and a" Y2 = ax ² "is input, as shown in FIG. 6
If (a), and "Y1 = ax", "Y2 = bx ^2"
8 is input, and in the case of FIG. 8A, “(x, y) =
(BcosT, sinT) "and" r = B "are input and stored in the respective registers.

Next, if it is determined in step S34 that the function expression is not input and displayed, NO is returned and step S36 is executed.
It is determined whether or not the input display of the scale of the variable data of the currently input function expression is displayed. The input display of the scale of the variable data is displayed on the display unit 2 as shown in FIGS. 4 (b), 6 (b), 6 (c), and 8 (b), for example.

This scale input display is indicated by the scale key 1
By pressing 3 (step S61), the CPU 7 performs a process of extracting variables from the graph-type registers 18 and 19 (step S62), and a register setting process that enables input of variables is performed (step S63), 1 A second variable scale can be input and displayed (step S6).
4). Then, ST is used to store the input scale.
When the key 14 is pressed, it is detected in step S33, and since it is a step input display, the process proceeds from step S33 to step S36, and the scale input in step S37 is stored for each corresponding variable. Here, when it is determined in step S38 that there is another variable, the process proceeds to step S39, and scale input display for another variable is performed.

The input scale is stored in the data area of the variable scale register 21 corresponding to each variable. When there is one variable as shown in FIGS. 4 and 8, the variable may be stored in the variable scale register 21, but when there is another variable as shown in FIG. 6, in step S38 and step S39. , Other variable scale input display processing is performed.

As described above, in each data input display, the data input processing is performed by operating the number / data input key 15. Next, dynamic key 12
When is pressed, the process proceeds to step S41, it is determined that the dynamic key 14 of the input unit 4 of FIG. 1 is pressed, and the functional expression for which the scale is input is read in step S42. Then, the CPU 7 creates graph data for each variable value that differs according to this variable scale (step S).
43). Further, the CPU 7 stores the created graph data in the graph storage register 21 of the storage unit 6 (step S44).

The above-described graph data creation and storage processing is repeated until all functional expressions are completed (step S45). Next, in step S46, it is determined whether or not the variables of the plurality of functional expressions are the same, and if they are the same, the CPU 7
Causes the graph data of different functional expressions stored in the graph storage register 21 to be simultaneously read and displayed on the display unit 2 (step S47). For example, as shown in FIG. 5A, a graph composed of two functional expressions is displayed.

Further, the CPU 7 reads out the next graph data at regular intervals and switches and displays them (step S).
48). For example, as shown in FIG. 5B or 5C, the graph data is sequentially read and the switching display is performed.
Here, if there is any key input, the switching display of the graph data ends, but while the key input is not performed, the switching display is repeated (step S49 → step S48).

If the variable data are not the same in step S46, the CPU 7 displays the first graph of the functional expressions Y1 and Y2 (step S5).
0), the next Y2 graph data is read, and only the Y2 graph data is switched and displayed (step S5).
1).

In this way, here, first, all graphs of Y2 are sequentially displayed (step S5).
2). Then, when all the graphs of Y2 are displayed, the graph data next to Y1 is read and displayed by switching to the graph at the beginning of Y1. If there is no other key input, the process returns to step S51 and Y2 is again displayed. The above switching display operation is repeated until all the graphs are switched and displayed and all the graphs of Y1 are displayed. As a result, the functional expression Y
You can see the relationship of all combinations of 1 and Y2 on the screen. For example, the display form of the above dynamic graph is such that one function graph is fixed and the other function graph is moved as in the relationship of (a), (b), (c), and (d) of FIG. Switch display is performed.

The case of the two functional expressions of circle and ellipse shown in FIGS. 8 and 9 can be considered in the same manner as above. Here, it is possible to set the scale of the range of the variable B by setting the variable B, and move and display the graph as shown in FIGS. 9A to 9C based on the scale for which the range is set. is there.

As described above, the graph display device according to the present embodiment sets a range of values to be substituted into the variable data of the function formula including variable data, and draws a dynamic graph of a plurality of function data corresponding to each value. However, if the variables are the same, they are displayed at the same time.If the variables are different, the combination of each variable is considered to switch the display, and the graph is moved to display the relationship of multiple dynamic graphs easily. I can now grasp.

The invention made by the present inventor has been specifically described based on the preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say. For example, in the above-described embodiment, two dynamic expressions are used to draw two dynamic graphs. However, the present invention is not limited to this, and three or more functional expressions are used to display three or more dynamic graphs. You may make it display on top.

Further, in the above-mentioned embodiment, the range of the variable data of the function formula is set by the start, the end and the pitch, but the variable data may be set individually.

[0038]

According to the graph display device of the first aspect, the graph drawing means draws the graph of the function formula data corresponding to each value of the range set by the variable data range setting means and draws the background image. Since the background image of the graph drawn by the graph drawing means is drawn by the means, the relationship between the movement of the dynamic graph and the background image can be directly compared on the screen.

According to the graph display device of claim 2,
Since a plurality of function formula data are sequentially switched by the display control unit provided in the display unit to display various combination modes, it is possible to visually grasp the relationship of graphs between the function formulas.

According to the graph display device of claim 3,
Since the function image data for drawing the background image is stored in the background image function formula data storage means, various background images can be drawn, and the background image data of the function formula data is stored by the background image data storage means. The background image can be easily switched and displayed.

According to the graph display device of claim 4,
If necessary, the background image can be displayed, or if the background image is unnecessary, the background image can be removed and only the graph by the graph drawing means can be displayed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part of a scientific calculator according to the present embodiment.

FIG. 2 is a flowchart illustrating main routine processing of the scientific calculator according to the present embodiment.

FIG. 3 is a flowchart illustrating the operation of a subroutine relating to the dynamic graph processing of FIG.

FIG. 4 is a diagram showing a data input display example in the dynamic graph processing of FIG.

FIG. 5 is a diagram showing an example in which two dynamic graphs made up of different function formula data having common variable data shown in FIG. 4 are displayed while being changed.

FIG. 6 is a diagram showing an input example of two function formula data each including different variable data.

FIG. 7 is a diagram including two different variable data shown in FIG.
The figure which shows the example displayed while changing two dynamic graphs which consist of one function formula data.

FIG. 8 is a diagram showing an input example of two function formula data including common variable data and different function formula data.

FIG. 9 is a diagram including two function formula data input in FIG.
The figure which shows the example displayed while changing one dynamic graph.

[Explanation of symbols]

 1 Scientific Calculator 2 Display Section 3 Display Drive Circuit 4 Input Section 5 ROM 6 Storage Section (RAM) 7 CPU 12 Dynamic Key 13 Scale Key 15 Numerical Value / Data Input Key 16 Display Register 17 Menu Register 18 Y1 Graph Type Register 19 Y2 Graph Expression register 20 Variable scale 21 Graph storage register 22 Work area

Claims (4)

[Claims] 1. A function formula data input means for inputting a plurality of different function formula data including variable data, and a value to be substituted for each variable data of the plurality of function formula data inputted by the function formula data input means. The variable data range setting means for setting the range of and the values within the range set by the variable data range setting means are assigned to the respective variable data, and a graph of a plurality of function formula data corresponding to the respective values is displayed. A graph display device comprising: a graph drawing unit for drawing; and a display unit for displaying a graph of a plurality of function formula data drawn by the graph drawing unit on the same screen. 2. The graph according to claim 1, wherein the display means is provided with display control means for sequentially switching and displaying a plurality of graphs for each of the plurality of functional expression data drawn by the graph drawing means. Display device. 3. The graph display device according to claim 1, wherein the variable data included in the plurality of different function formula data is common variable data. 4. The graph display device according to claim 1, wherein the variable data included in the plurality of different function formula data is different variable data for each function formula data.