JP2000132696A - Graph display device, its method, and recording medium recording graph display processing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To express a given functional formula as the combined body of the plural functional formulas by easily dissolving it without requiring a complicated and troublesome input operation in a graph display device. SOLUTION: When a 'division' key 12c is operated in a state where the optional function formula 'Y1' is inputted and displayed in a liquid crystal display part 13, configuration elements '2x2', '+3x' and '+1' in the functional formula are divided in accordance with an operator in the formula and stored in a division data memory 19c and the division patterns are displayed by identification. When the desired division pattern is selectively displayed and an 'OK' key 12d is operated by the operation of key 12h or 12i or the direct pen touch operation with a tablet 14 as against each configuration element in the functional formula, the dissolved functional formulas 'Y2' and 'Y3' are generated in accordance with the above operation, stored in a functional formula data memory 19d in accordance with individually different display designation color, classified by color together with the functional formula 'Y1' of a division source and displayed by graphic plotting.

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, a graph display method, and a recording medium storing a graph display processing program for displaying a graph according to a function expression.

[0002]

2. Description of the Related Art In a computer having a function calculation function, when a graph mode is set and an arbitrary function formula or statistical data is input and a drawing of a graph is instructed, the input function formula or statistical data is input. 2. Description of the Related Art An electronic computer called a graph scientific calculator that draws and displays a corresponding graph has been put to practical use.

When displaying a graph corresponding to a certain function formula (for example, Y = 2 × ² + 3x + 1) with such a conventional graph function calculator, the graph corresponding to the function formula is a combination of a plurality of function formulas. to represent the meaning that is from the body in education, etc., function expression of interest ^{(Y = 2x 2 + 3x +} 1) a plurality of function formula obtained by dividing in advance with a plurality of function elements (e.g., Y = 2x ² and Y = 3x + 1)
It is necessary to perform an input operation for each of the functional expressions and display each corresponding graph.

[0004] In other words, in this case, Y1 = 2x ² +3
by performing ^{x + 1, Y2 = 2x 2} , Y3 = 3x + 1 input operation of the three function expression to, must be rendered display a graph corresponding to each of the function expression.

[0005]

As described above, in the conventional graph function calculator, in order to display a graph of each of a plurality of function expressions obtained by decomposing a certain function expression, it is necessary to decompose the function expression into arbitrary function parts in advance. After inputting all of the plurality of function formulas by key operation or the like, it is necessary to give an instruction to draw and display the corresponding graph, which makes the input operation complicated and very troublesome, and Even when graphs respectively corresponding to a plurality of function formulas are drawn and displayed, there is a problem that it is not easy for a user in the course of education to find out which graph corresponds to each function formula, especially for a user in the course of education.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a first object of the present invention is to easily decompose a given function expression into a plurality of functions without having to perform complicated and troublesome input operations. An object of the present invention is to provide a graph display device, a graph display method, and a recording medium that stores a graph display processing program, which can be expressed as a combination of functional expressions.

A second object of the present invention is to determine which graphs correspond to each of the function formulas when the graphs corresponding to the plurality of decomposed function formulas are drawn and displayed.
It is an object of the present invention to provide a graph display device, a graph display method, and a recording medium that stores a graph display processing program that can be easily identified.

[0008]

That is, a first graph display device according to the present invention comprises an input means for inputting a function expression and a plurality of function expressions input by the input means for forming the function expression. And a graph corresponding to each of the plurality of component function expressions decomposed by the expression decomposition unit and the function expression input by the input unit. And a graph display means for drawing and displaying.

In such a first graph display device, the input function expression is automatically decomposed into a plurality of component function expressions according to a plurality of function elements constituting the function expression, and the decomposed function expression is obtained. Since a plurality of component function expressions and graphs corresponding to the input function expressions are separately drawn and displayed, the decomposition of the function expression and the decomposition function expression can be performed without performing the input operation of the decomposition function expression for the input function expression. Can be displayed as a graph.

A second graph display device according to the present invention is the first graph display device, wherein the graph display means comprises: a plurality of component function expressions decomposed by the expression decomposition means; A graph display means is provided which draws and displays a graph corresponding to each of the function formulas input by the means separately in different colors.

In such a second graph display device, the graphs corresponding to each of the plurality of decomposed component function expressions and the input function expressions are separately displayed in different colors, so that each decomposition function The graph corresponding to the expression can be easily identified.

[0012]

FIG. 1 is a block diagram showing a configuration of an electronic circuit of a computer having a function calculating function according to an embodiment of a graph display device of the present invention.

The control unit (CPU) 11 includes a key input unit 12
From the tablet 14 provided on the display screen of the liquid crystal display unit 13 capable of performing color display, and touch position data by a touch pen input through the position detection circuit 15. hand,
A system program stored in the ROM 16 is started up, or a computer control program stored in the external storage medium 17 is stored in the storage medium reading unit 18.
The RAM 19 is used as a work memory to control the operation of each part of the circuit.

The control section (CPU) 11 is connected to the key input section 12, the liquid crystal display section 13, the tablet 14, the position detection circuit 15, the ROM 16, the RAM 19, and the recording medium reading section 18. Reference numeral 13 is connected via a display drive circuit 20.

The key input section 12 is provided with a data input key 12a comprising a character / symbol key group such as a numeric keypad, an alphabet key, an operator key, and a function key.
Select and set various operation modes such as graph mode for performing graph display processing corresponding to any function expression, calculation mode for performing calculation processing corresponding to any input expression, and program mode for performing calculation processing corresponding to any input program "Mode" key 12b operated at the time of performing the operation, "split" key 12c operated at the time of decomposing the input function expression into a plurality of function expressions divided by a plurality of function elements, and accompanying the decomposition of the function expression “O” operated when the division pattern is determined
"K" key 12d, a "graph" key 12e operated when instructing drawing of a graph corresponding to the input function expression and the decomposed function expression, and trace the XY coordinates on the graph with the pointer P A "trace" key 12f operated when setting a trace function to be displayed, for switching the display of graphs corresponding to each of a plurality of decomposed function expressions in accordance with the disassembly display of the function expressions. "Display switching" key 12g, and in the graph mode, "△" key 12h and "@" as division pattern switching keys functioning to selectively switch and display the division pattern accompanying the decomposition of the function expression. Key 12i,
Then, "↑" key 12j, "↓" key 12k, and "←" key 12l, which are the up, down, left, and right cursor keys operated when selecting the displayed data, and performing the operation of moving or moving the cursor and the pointer. , "→" key 12m and the like.

The tablet 14 is provided on the display screen of the liquid crystal display unit 13 and generates a voltage signal corresponding to the position touched by the pen.
4, a coordinate corresponding to the display screen is detected by the position detection circuit 15 based on the voltage signal corresponding to the touch position, and the control unit (CP)
U) 11 determines the content of the operation.

The ROM 16 stores in advance system program data that governs the overall processing in the electronic circuit of the computer, and processes various operation modes such as the graph mode shown in FIGS. 2, 3 and 4. The control program data, which is subprogram data for controlling the program, is also stored in advance.

The RAM 19 has a display data memory 19
a, flag memory 19b, divided data memory 19c, function formula data memory 19d, graph data memory 19e
And the like, and a work memory necessary for executing other functions.

Display data to be displayed on the liquid crystal display unit 13 is stored in the display data memory 19a as bit map pattern data.

In the flag memory 19b, when a graph corresponding to the original function formula accompanying the graph display of the plurality of decomposed function formulas is set to be drawn and displayed on the movement locus of the pointer P by the trace function, " The trace drawing flag t set to 1 "is stored.

The divided data memory 19c stores each function element divided based on the original function formula stored in the function formula data memory 19d.

An arbitrary function expression input in the graph mode processing and a plurality of function expressions decomposed according to each function element stored in the divided data memory 19c are individually stored in the function expression data memory 19d. Is stored in association with the display designation color.

In the plurality of function expressions stored in the function expression data memory 19d, a mark "'" is added to the Y symbol of the function expression that is the source of the decomposition.

In the graph data memory 19e, the coordinates of each drawing dot point of each graph corresponding to each function formula stored in the function formula data memory 19d are calculated for each drawing dot, and each corresponding drawing point is sequentially calculated. Are written as bitmap data and are drawn and stored as graph data. In the graph data corresponding to each of the function expressions stored in the graph data memory 19e, the same display designation color as the display designation color designated in each function expression is stored in association with it.

In addition, the work memory temporarily stores various data input / output by the control unit (CPU) 11 as needed in connection with the control processing of various operation modes.

Next, the operation of the computer having the function calculating function according to the above configuration will be described.

FIG. 2 is a flowchart showing a graph mode process (1) by the computer.

FIG. 3 is a flowchart showing a graph mode process (2) by the computer.

FIG. 4 is a flowchart showing a graph mode process (3) by the computer.

FIG. 5 is a diagram showing an operation display state accompanying the division and decomposition of the function formula by the graph mode processing (1) by the computer.

FIG. 6 is a diagram showing an operation display state accompanying the graph drawing of the decomposition function equation by the graph mode processing (part 2) and (part 3) by the computer.

FIG. 7 is a diagram showing an operation display state accompanying the graph switching of the decomposition function equation by the graph mode processing (part 3) by the computer.

When the operation mode of the control unit (CPU) 11 is set to the graph mode in response to the operation of the "mode" key 12b of the key input unit 12, the program data stored in the ROM 16 is read out, and 2, the graph mode processing in FIGS. 3 and 4 is started, and an input screen for function formula data is displayed on the liquid crystal display unit 13.

According to the input screen of the function formula data displayed on the liquid crystal display unit 13, as shown in FIG. 5A, by selecting the data input key 12a in the key input unit 12, for example, an arbitrary function formula "Y1" = 2x ² + 3x + 1 ”, the function expression entered by the key is
9 is stored in the function formula data memory 19d,
Displayed on the liquid crystal display unit 13 (step S1 → S2, S
3).

Thus, an arbitrary function expression “Y1 = 2 × ² +
In the state where “3x + 1” is input and displayed, a key input is performed as shown in FIG. 5B in order to represent the connection state of a plurality of function elements constituting the function expression by a graph display obtained by decomposing the function expression. When the "split" key 12c of the unit 12 is operated, the function formula specified by the cursor display or the like as a target of disassembly, in this case, is stored in the function formula data memory 19d in the RAM 19 and is stored in the liquid crystal display unit. function formula displayed in the 13 "Y1 = 2x ² + 3x + 1" is, for example, the function subtraction operator contained in formulas "+""-" three functions elements in accordance with the "2x ^2", "3x", "1 And stored in the divided data memory 19c in the RAM 19 (steps S4 → S5).

At the same time, identification display is performed according to one of a plurality of divided patterns obtained by combining the divided elements of the function formula stored in the divided data memory 19c (step S6). In this case, for example, in the divided elements “2x ² ”, “3x”, and “1” of the function expression stored in the divided data memory 19c,
The identification of the divided pattern divided into “2x ² ” and “3x + 1” is identified and displayed by highlighting one of the divided elements “2x ² ”.

When the "@" key 12h or the "@" key 12i on the key input unit 12 is operated during the division process of such a function expression, one of the divided elements is displayed in reverse on the liquid crystal display unit 13. The divided pattern identified and displayed is, for example, pattern 1 (“2x ² ” “3x + 1”) → pattern 2 (“2x ² + 3x” “1”) → pattern 3
(“2x ² +1” and “3x”) are sequentially switched and displayed for each key operation (step S7 → S
8 → S9).

During the division of the function expression,
The function expression “Y1 = 2 × ² ” displayed on the liquid crystal display unit 13
+ 3x + 1 each division element of "," 2x ² "," 3x "and" 1 "
Is selectively touched with the pen via the tablet 14, the divided element corresponding to the pen touch position is highlighted and displayed as an arbitrary divided pattern (step S10 → S11 → S12).

Then, the "@" key 12h or "@"
Switching identification division pattern by key 12i, or the dividing elements in the functional expression by identification division pattern due to direct pen touch, identification to the function expression "Y1 = 2x ² + 3x + 1" is desired division pattern When the “OK” key 12d of the key input unit 12 is operated in order to determine the division pattern in the state of the division processing performed as shown in FIG.
First, another independent function expression one function element data displayed identified by inverted "2x ^2" is "Y2 = 2x ^2"
Is stored in the function formula data memory 19d in association with, for example, a display designation color of “red” and is displayed on the liquid crystal display unit 13 (step S13 →
S14 → S15).

Further, the remaining function element data "3x + 1" identified and displayed is converted to another independent function formula "Y".
3 = 3x + 1 ”, and the function formula data memory 1
For example, a display designation color of “green” is stored in association with 9d and displayed on the liquid crystal display unit 13 (step S16).

[0041] Then, the "Y1" symbol of the divided object and become the original function expression "Y1 = 2x ² + 3x + 1", indicating that the functional expression of said original "'" mark is appended stores "Y1' = ... both are displayed as "correlated""different display the designated color is the" blue said each display designated color of each divided functional expression "Y2 = 2x ^2", "Y3 = 3x + 1,""red,""green And stored in the function formula data memory 19d (step S17).

[0042] Then, the divided target became original function expression ^{"Y1 '= 2x 2 + 3x +} 1 " each component, and the function formulas that are independent produced by the division "Y2 = 2x ^2", "Y3
= 3x + 1 ”is stored in the function formula data memory 19, respectively.
The corresponding display designation colors set and stored in d are displayed in different colors (step S18).

In this way, the function expression “Y1 ′ = 2 × ² +
3x + 1 "is resolved in accordance with the desired division pattern," Y2 = 2x ² "with its original function expression" Y1 '= ... "
In a state where the color is displayed as an independently generated color as “Y3 = 3x + 1”, in order to graphically express the connected state of the decomposed functional expressions, as shown in FIG. When the "graph" key 12e is operated,
In the function expression data memory 19d in the RAM 19, it is determined whether or not the function expression with the "'" mark is stored, that is, whether or not there is a function expression from which the function expression is decomposed. (Step S19 → S2)
0).

In this case, the function expression data memory 19d
Has a function expression "Y1 '= 2x
² + 3x + 1 "is stored, and if it is determined that the decomposition process of the function expression has been performed, the divided first
Function expression "Y2 = 2x ^2" with the corresponding graph data are drawn stored in association with the display designated color "red" in the graph data memory 19e in the RAM19 is generated, to the liquid crystal display unit 13 Then, a graph is displayed in the display designation color “red” (step S20 → S21).

Further, along with this, the division function equation corresponding to the red displayed graph data "Y2 = 2x ^2" is read from the function formula data memory 19d, it is displayed in the display designated color "red" ( Step S22).

Here, if it is determined that the display of all the graphs of the divided function formulas stored in the function formula data memory 19d is not completed, the processing from the step S21 is repeatedly executed again, and As shown in FIG.
Graph data corresponding to the divided second function formula "Y3 = 3x + 1" is generated and stored in a graph data memory 19e in the RAM 19 in association with the designated display color "green". A graph is displayed on the display unit 13 in the display designation color "green" (step S2).
3 → S21).

At the same time, the division function expression "Y3 = 3x + 1" corresponding to the graph data displayed in red is read out from the function expression data memory 19d, and is displayed in the display designation color "green" (step). S22).

When it is determined that the display of all the divided function formulas "Y2" and "Y3" stored in the function formula data memory 19d has been completed, the trace display mode is set. trace drawing flag t is stored in the flag memory 19b is set to "1", the original function expression ^{"Y1 '= 2x 2 + 3x +} 1 " to display the drawing corresponding to the graph to the moving trajectory of the pointer P by trace function An operation state is set (step S23 → S24).

At this time, the pointer P is displayed on the graph display screen of the liquid crystal display section 13, and the apparatus enters a standby state for starting graph drawing by trace display.

In this trace display mode, FIG.
As shown in (F), when the "→" key 12m of the key input unit 12 is operated, the trace drawing flag t stored in the flag memory 19b in the RAM 19 is set to "1"; The original function formula "Y
It is determined that the trace drawing processing of the graph corresponding to “1 ′ = 2 × ² + 3 × + 1” is being performed (step S25 →
S26 → S27 → S28).

[0051] Then, the "→" each time the key 12m is operated, the original function expression ^{"Y1 '= 2x 2 + 3x +} 1 "
The dot coordinates of the graph corresponding to are calculated and stored in the graph data memory 19e in the RAM 19 in association with the display designation color "blue", and are moved and displayed by the pointer P as indicated by the arrow q. , the XY coordinates are sequentially updated and displayed, as graph trajectory of movement by the pointer P corresponding to the original function expression ^{"Y1 '= 2x 2 + 3x +} 1 ", drawn by "blue" of the set displayed designated color Are displayed (step S28 → S29a, S
30, S31 → return). At this time, the original function expression "Y1 '=
2x ² + 3x + 1 ”is also read out from the function data memory 19d and displayed, and the respective components of the function expression are already displayed in different colors as shown in FIGS. 6 (D) and 6 (E). The color of each of the decomposed function formulas is displayed in the same color as the designated display color.

[0052] After this, the "→" that key 12m is repeatedly operated, color rendering graph display corresponding to the trace displayed on accompanying the original functional expression of the pointer P ^{'Y1' = 2x 2 + 3x +} 1 " Are sequentially performed, and FIG.
When the trace drawing display of the graph corresponding to the original function expression on the graph display screen on the liquid crystal display unit 13 reaches the end point, the trace drawing flag t stored in the flag memory 19b in the RAM 19 as shown in FIG. Is reset to "0" (steps S31 → S32).

Thus, each of the decomposed function formulas “Y 2” stored in the function formula data memory 19 d in the RAM 19 is stored.
= 2x ² "" Y3 = 3x + 1 "and its original function expression" Y
Three graph data respectively corresponding to “1 ′ = 2 × ² + 3 × + 1” are drawn and generated, and are displayed in the liquid crystal display unit 13 in a color-coded manner together with the function formula. When the "↓" key 12k is operated, the function expression of the graph to be traced by the pointer P is changed to the "Y1 '" graph every time the "↑" key 12j or the "↓" key 12k is operated. →
Switching from the graph of "Y2" to the graph of "Y3" is designated (steps S33 → S34 → S35).

When the “→” key 12 m or the “←” key 121 of the key input section 12 is operated, the R
When it is determined that the trace drawing flag t stored in the flag memory 19b in the AM 19 has been reset to “0”, the “↑” key 12j or the “↓” key 12k
"Y1 '" and "Y2" designated to be switched according to the operation of
A pointer P is displayed on a graph corresponding to any one of the function expressions "Y3", and the pointer P on the graph is moved and trace-displayed at each key operation, and XY coordinates corresponding to each display dot position are displayed. It is sequentially updated and displayed (steps S25 → S26 → S27 → S29b).

On the other hand, the flag memory 1 in the RAM 19
In the middle of the trace drawing display of the graph corresponding to the original function expression "Y1 '" in which the trace drawing flag t stored in 9b is set to "1", the "?"
By operating the j or "↓" key 12k, the function expression "Y2
When the "→" key 12m or the "←" key 12l is operated in a state in which the trace drawing flag t is set to "1". Is also associated with the original function expression "Y1
Is determined to be in the middle of drawing a graph, a trace display is performed by moving the pointer P on the graph corresponding to the switched function expression ("Y2" or "Y3") (step S25 →). S26 → S27 →
S28 → S29b).

The decomposed function formulas "Y" stored in the function formula data memory 19d in the RAM 19 are stored.
3 = 2x ^2, “Y 3 = 3x + 1” and three graph data drawn and generated corresponding to the original function formula “Y 1 ′ = 2x ² + 3x + 1” are color-coded together with the function formula on the liquid crystal display unit 13. While displayed, FIG.
As shown in (H), when the "display switching" key 12g in the key input section 12 is operated, the above-mentioned three-
It is determined whether all the graphs respectively corresponding to the three function expressions "Y1 '", "Y2", and "Y3" are displayed. If it is determined that all the graphs are being displayed, a "'" mark is added. youngest (small) function formula are functional equation or expression number, i.e., the original function expression "Y1 '= 2x ² + 3x +
The blue graph displayed corresponding to "1" is once deleted and hidden (steps S36 → S37 → S3).
8).

Subsequently, as shown in FIG. 7I, the "display switching" key 12
When g is operated, in the step S38, the by graph corresponding to the original function expression ^{"Y1 '= 2x 2 + 3x +} 1 " is erased, it is determined that not being displayed in full graph, further, all graphs Whether or not it is hidden
That is, it is determined whether or not all the graphs are in the erased display state (steps S36 → S37 → S39).

[0058] In this case, although the non-display processing of the graph corresponding to the original function expression "Y1 '' is being carried out, the two function expressions decomposed" Y2 = 2x ² "" Y3 = 3x +
Since it is determined that the non-display processing of each graph corresponding to "1" is not performed, every time the "display switching" key 12g is operated, as shown in FIG. 7 (I) → FIG. 7 (J). the red and green each graph of the function expression corresponding respectively in the order of the formula ID (Y2 → Y3) "Y2 = 2x ^2" "Y3 = 3x + 1" is an erased sequentially once stepwise hide (Step S39 → S40).

[0059] That is, by operating the "display switch" key 12g of the key input unit 12, the functional expression "Y2 = 2x ^2" decomposed "Y3 = 3x + 1" and its original function expression "Y1 '= 2x ² + 3x + 1 ”are respectively drawn and generated by the key 12g
, The original graph "Y1 '" → the first decomposition graph "Y1'"
2 "→ second decomposed graph" Y3 ", which is erased in a stepwise manner and is not displayed. As shown in FIG. 7 (J), all graphs of three decomposed functional expressions are displayed. When the "display switch" key 12g is operated again as shown in FIG. 7 (K) at the stage where the non-display processing is performed, the entire graph is not being displayed and the non-display of all the graphs is not performed. When it is determined that the processing has been completed, the three graph data that are not displayed in a stepwise manner are stored in the graph data memory 19e in the RAM 19 as shown in FIGS. 7 (H) to 7 (J). Based on each graph data stored and stored in the storage area, the corresponding display designation color is again displayed in different colors (steps S36 → S37 → S39 → S41).

Thus, the original function expression “Y1 ′ = 2 × ^2”
+ 3x + 1 ”is obtained by decomposing each functional expression“ Y2 = 2x
² "and" Y3 = 3x + 1 "can be easily expressed.

Therefore, the function calculation function of the above configuration is provided.
According to the electronic computer, “data” in the key input unit 12
By operating the "input" key 12a, an arbitrary function expression "Y1 =
2x ^Two+ 3x + 1 "is input and displayed on the liquid crystal display unit 13.
When the “split” key 12c is operated in the
The formula element “2x^Two"+ 3x" "+1" is the formula
The RAM 19 is divided according to the "+" operator inside.
Stored in the divided data memory 19c in the
The division pattern consisting of the combination is identified and displayed.
"△" key 12h or "▽" key as turn switching key
-12i, or for each component of the function formula
Direct pen touch operation through the tablet 14
The desired division pattern “2x^TwoSelect "3x + 1"
Is displayed and when the "OK" key 12d is operated, the minute
The function formula “Y2 = 2x” decomposed according to the split pattern^Two"
"Y3 = 3x + 1" is generated, and the function formula data memory 1
Stored in 9d in association with different display designation colors
And the liquid crystal display unit 13 displays the function formula of the division source.
Since it is displayed in different colors with "Y1",
For each input of the function expression "Y1",
You don't need to input each one considering the configuration of
Can easily be obtained.

According to the computer having the function calculating function having the above-mentioned configuration, the original function formula “Y 1 = 2 × ² + 3 ×
+1 ", each decomposition function expression this" Y2 = 2x ² "," Y3
= 3x + 1 "are drawn and displayed in a color-coded manner by the corresponding display designation color in accordance with the operation of the" graph "key 12e. In particular, the graph corresponding to the original function formula" Y1 " Is drawn as a trace of the movement of the pointer P by the trace function based on the movement display of the pointer P. Further, after the display of the original function formula and each decomposition function formula, the "display switching" key 12g is displayed. Every time is operated, the graph of the original function expression "Y1" → the graph of the first decomposition function expression "Y2" → the graph of the second decomposition function expression "Y3" is sequentially and non-displayed. Thereafter, by operating the "display switching" key 12g again, each corresponding graph is redisplayed in the set display designation color, so that the original function expression "Y1" is replaced with the decomposed function expression "Y2". "Y3" and how It can be easily understood whether the connection is in a proper connection state, and at that time, the respective graphs corresponding to the respective functional expressions can be distinguished at a glance.

In the above embodiment, the case where the input function formula is decomposed into two component function formulas has been described. However, three or more component formulas may be used in accordance with the element form of the function formula that is the source of the decomposition. Decomposition into a component function formula can of course be performed by the same method as described above.

The method described in the above embodiment, that is, each method in the graph mode processing shown in the flowcharts of FIGS. 2, 3, and 4 is a program that can be executed by a computer as a memory card (ROM card). , A RAM card, etc.), a magnetic disk (floppy disk, hard disk, etc.), an optical disk (CD-ROM, DVD, etc.), an external recording medium 17 such as a semiconductor memory, and the like. Then, the computer reads the program recorded on the external recording medium 17 by the recording medium reading unit 18, and the operation is controlled by the read program. , The function of graph display of each function expression is realized, and the same processing by the above-described method can be executed.

[0065]

As described above, according to the first graph display device of the present invention, the input function expression is converted into a plurality of component function expressions according to a plurality of function elements constituting the function expression. It is automatically decomposed, and the plurality of decomposed component function expressions and the graphs corresponding to the input function expressions are separately drawn and displayed, so that the input operation of the decomposition function expression for the input function expression is not required. In addition, the decomposition of the function expression and the graph display of the decomposition function expression can be performed.

Further, according to the second graph display device of the present invention, the plurality of decomposed component function expressions and the graphs corresponding to the input function expressions are separately displayed in different colors. Therefore, the graph corresponding to each decomposition function expression can be easily identified.

Therefore, according to the present invention, it is possible to easily decompose a given function expression and express it as a combination of a plurality of function expressions without having to perform complicated and troublesome input operations. Further, when graphs respectively corresponding to the plurality of decomposed function expressions are drawn and displayed, it is possible to easily distinguish which graph corresponds to each function expression.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an electronic circuit of an electronic computer with a function calculating function according to an embodiment of a graph display device of the present invention.

FIG. 2 is a flowchart showing a graph mode process (1) by the computer.

FIG. 3 is a flowchart showing a graph mode process (2) by the computer.

FIG. 4 is a flowchart showing a graph mode process (3) by the computer.

FIG. 5 is a view showing an operation display state accompanying the division and decomposition of the function formula by the graph mode processing (1) by the computer.

FIG. 6 is a view showing an operation display state accompanying the graph drawing of the decomposition function equation by the graph mode processing (part 2) and (part 3) by the computer.

FIG. 7 is a view showing an operation display state accompanying graph switching of a decomposition function equation by graph mode processing (part 3) by the computer.

[Explanation of symbols]

11: control unit (CPU), 12: key input unit, 12a: data input key, 12b: "mode" key, 12c: "divide" key, 12d: "OK" key, 12e: "graph" key, 12f ... "Trace" key, 12g ... "display switching" key, 12h, 12i ... "△""▽" key (split pattern switching key), 12j-12m ... "↑""↓""←""→" key (cursor 13) liquid crystal display unit, 14 ... tablet, 15 ... position detection circuit, 16 ... ROM, 17 ... external recording medium, 18 ... recording medium reading unit, 19 ... RAM, 19a ... display data memory, 19b ... flag memory 19c: Divided data memory 19d: Function formula data memory 19e: Graph data memory 20: Display drive circuit

Claims (7)

[Claims] 1. An input means for inputting a function expression, and an expression decomposing means for decomposing the function expression input by the input means into a plurality of component function expressions according to a plurality of function elements constituting the function expression. A graph display unit for separately drawing and displaying graphs corresponding to the plurality of component function expressions decomposed by the expression decomposing unit and the function expressions input by the input unit, respectively. Display device. 2. An expression decomposing means for decomposing into a plurality of component function expressions corresponding to a plurality of function elements constituting the function expression, based on an operator included in the function expression input by the input means. 2. The graph display device according to claim 1, wherein the graph display device is a decomposition unit. 3. The element decomposing means: an element dividing means for dividing the function expression input by the input means into a plurality of function elements based on an operator included in the function expression; Divided pattern display means for displaying a plurality of combination patterns of the plurality of function elements according to a predetermined operation, and selecting one of the combination patterns of the plurality of function elements displayed by the divided pattern display means And a component function formula generating means for generating a plurality of component function formulas in accordance with a combination pattern of a plurality of function elements selected by the dividing pattern selecting device. The graph display device according to claim 1. 4. The graph displaying means displays the graphs corresponding to each of the plurality of component function expressions decomposed by the expression decomposing unit and the function expressions input by the input unit, separately by color-coding. 4. The graph display device according to claim 1, wherein the graph display device is a display unit. 5. The graph display means separately color-codes a graph corresponding to each of the plurality of component function expressions decomposed by the expression decomposing means and the function expression input by the input means together with each function expression. The graph display device according to any one of claims 1 to 3, wherein the display device is a graph display unit that performs drawing and display. 6. An input step of inputting a function expression, and an expression decomposition step of decomposing the function expression input in the input step into a plurality of component function expressions according to a plurality of function elements constituting the function expression. And a graph displaying step of separately drawing and displaying a plurality of component function expressions decomposed in the expression decomposing step and graphs respectively corresponding to the function expressions input in the input step. How to display graphs. 7. A recording medium storing a graph display processing program for controlling a computer of a graph display device that displays a graph according to a function expression, wherein the computer is a recording medium for inputting a function expression. An expression decomposing means for decomposing the function expression input by the input means into a plurality of component function expressions according to a plurality of function elements constituting the function expression; a plurality of component function expressions decomposed by the expression decomposing means; A recording medium recording a graph display processing program for functioning as a graph display unit for separately drawing and displaying graphs corresponding to each of the function expressions input by the input unit.