JP4192850B2 - Mathematical expression display control apparatus and program - Google Patents

Description

  The present invention relates to a mathematical expression display control device and a program.

2. Description of the Related Art Conventionally, there is known a mathematical expression display control device called a calculator (electronic desk calculator) that executes a calculation based on an input mathematical expression and displays a calculation result when various mathematical expressions are input. In addition to the four arithmetic operations, a calculator is known which is called a scientific calculator that can calculate trigonometric functions and logarithmic functions. In the scientific calculator, a display format suitable for a scientific calculator that can be displayed with a small number of display lines (hereinafter referred to as “one-line display format” as appropriate), a general textbook, a book, etc. (Hereinafter, referred to as “natural display format” as appropriate). For example, in the case of representing the square of a, a scientific calculator using a one-line display format displays “a ^ 2”, and a natural display format displays “a ² ”.

  Here, when the natural display format is compared with the one-line display format, the user is more intuitive because the mathematical expression displayed in the natural display format is more intuitive and familiar. However, in order to display in a natural display format when displaying an integral symbol or displaying a fraction, an area for a plurality of lines is required as a display area. Therefore, the display screen included in the scientific calculator is required to be relatively large, and cannot be used in a small and inexpensive product with a small screen, and if a large display screen is provided, it is portable as a calculator. Will be damaged.

Therefore, in order to display more mathematical expressions in a limited display screen of a scientific calculator, an invention that can display a combination of a natural display format and a one-line display format is known (for example, patents). Reference 1).
JP-A-6-202989

  However, in the method disclosed in Patent Document 1, for example, when an integral is input, components of mathematical expressions such as an upper limit value and a lower limit value are uniformly switched to a one-line display format and displayed. Although the user wants to display in the natural display format with high visibility, conventionally, the display is switched to the single-line display format in a fixed manner, so that the visibility is inconvenient and inconvenient.

  Furthermore, even if the input mathematical formula is calculated and the calculation result is displayed, if the entire mathematical formula and the calculation result cannot be displayed on the display screen in the natural display format, the display mode is fixedly changed. Or the formula and the calculation result are displayed separately. Therefore, conventionally, it has been impossible to display the entire mathematical expression in the natural display format as much as possible and also display the calculation result.

  In view of the above-described problems, the present invention provides a mathematical expression display control device capable of displaying more parts of mathematical expressions by switching the display form of mathematical expression components for mathematical expressions exceeding the size displayed on the display screen. The purpose is to provide.

A mathematical expression display control device according to the present invention includes a mathematical expression component input means for inputting a mathematical expression for each mathematical expression component constituting the mathematical expression, and each mathematical expression component input by the mathematical expression component input means in a predetermined display area. Natural display control means arranged at each position in the display and displayed in a natural display format, and at the position of any one of the mathematical expression components arranged at each position by the natural display control means, Determining means for determining whether or not the new mathematical formula component can be displayed in the natural display format in the display area when a new mathematical formula component is input by the mathematical formula component input means. And when the determination means determines that the natural display format cannot be displayed in the display area, the expression component controlled by the natural display control means A display mode changing control means for displaying by reducing the font Chi display range and turned components, characterized in that it comprises a.

  Another mathematical expression display control device according to the present invention is an input means for inputting an integral expression having an upper limit value and a lower limit value, and the integral expression inputted by the input means is naturally displayed in a predetermined display area. Natural display control means for displaying in the form, determination means for determining whether the integral expression displayed by the natural display control means exceeds the vertical width of the display area, and the vertical direction by the determination means Control means for sequentially reducing the upper limit value, the lower limit value, and the integrand font of the integral expression until it falls within the display width when it is determined that the width exceeds the display width. .

According to the invention described in claim 1 or 3, when it is determined that the mathematical formula component cannot be displayed in the natural display format in the display area when the input mathematical formula is displayed in the natural display format. It is possible to reduce the font of the constituent element out of the display range among the mathematical expression constituent elements and display the mathematical expression in the display area.

  According to the invention described in claim 2 or 4, when an integral expression having an upper limit value and a lower limit value is input and displayed in a natural display format within a predetermined display area, the integral expression to be displayed is If the vertical width of the display area is exceeded, the integration formula upper limit value, lower limit value, and integrand font are reduced in order until the display area fits within the display width, and the integration formula is displayed in the display area. be able to.

  Next, referring to the drawings, an embodiment in the case where the present invention is applied to a scientific calculator which is a kind of mathematical expression display control device will be described in detail with reference to the drawings. It is not limited to this.

[First Embodiment]
First, a first embodiment will be described with reference to the drawings. In the first embodiment, when a mathematical expression cannot be displayed in the natural display format on the display screen, a predetermined component among the components displayed in the natural display format is changed to a one-line display. To display.

[1.1 Configuration]
FIG. 1 shows an overview of the scientific calculator 1. As shown in FIG. 1, the scientific calculator 1 includes a display 3 and various key groups 5. Here, the keys constituting the various key groups 5 are assigned with unique functions, and the scientific calculator 1 is operated by pressing these keys by the user.

  The display 3 is a part that displays various data, mathematical formulas, and calculation results necessary for using the scientific calculator 1, such as characters and codes corresponding to various key presses. Here, the display 3 is a display device such as a TFT (Thin Film Transistor) liquid crystal, a PDP (Plasma Display Panel), or a dot matrix liquid crystal.

  The various key group 5 is a key group for inputting a mathematical expression composed of a numerical value, a calculation symbol, or the like to the scientific calculator 1 or instructing processing. Here, a number key group 5a, an arithmetic operation key group 5b, an EXE key 5c, a direction key 5d, an integration key 7a, a fraction key 7b, and a power key 9 are provided.

  The numeric key group 5a is a key for inputting a numerical value to the scientific calculator 1, and the four arithmetic operation key group 5b is a key for inputting an operator for executing the four arithmetic operations.

  The EXE key 5c is a key for instructing the scientific calculator 1 to execute and determine processing. Further, after the user inputs a mathematical formula, the value calculated from the mathematical formula can be obtained by pressing the EXE key 5c. The power key 9 is a key for turning on / off the power of the scientific calculator 1.

  The direction key 5d is a key that is pressed when the cursor is moved or a function is selected. In this embodiment, the direction key 5d can be input in four directions, up, down, left, and right.

  The scientific calculator 1 includes various function keys for inputting a function and executing processing. For example, an integration key 7a for inputting an integration function, a fraction key 7b for inputting a fraction, and the like are provided.

  FIG. 2 is a block diagram illustrating a configuration of the scientific calculator 1. As shown in the figure, the scientific calculator 1 includes a CPU (Central Processing Unit) 10, a ROM (Read Only Memory) 20, a RAM (Random Access Memory) 30, an input unit 40, and a display unit 50. The parts are connected by a bus 60.

[1.2 Storage unit]
The ROM 20 stores various programs related to the operation of the scientific calculator 1, such as menu display processing, various setting processes, various arithmetic processing, etc., programs for realizing various functions provided in the scientific calculator 1, etc. A table 202, a main program 204, and a first display program 210 are stored.

  The functional expression display table 202 is a table that stores display forms of mathematical expression components (hereinafter simply referred to as “components”) that constitute mathematical expressions. Here, there are “natural display format” and “single-line display format” as display modes of the constituent elements. For example, referring to a diagram showing an example of the function expression display table 202 in FIG. 3, the integration function expression includes a first area indicating a lower limit value, a second area indicating an upper limit value, and an integrand expression. And a display mode for each component is stored.

  The RAM 30 is a memory that can be written at any time to temporarily hold various programs executed by the CPU 10, data related to the execution of these programs, and the like. In the present embodiment, an area for the mathematical formula storage area 302 is secured.

  The mathematical expression storage area 302 is an area for storing mathematical expressions input by the user. For example, as shown in FIG. 3, the CPU 10 stores the mathematical formula input by the user in the mathematical formula storage area 302.

[1.1.3 CPU]
The CPU 10 executes processing based on a predetermined program in accordance with an input instruction, and transfers instructions and data to each function unit. Specifically, the CPU 10 reads a program stored in the ROM 20 in accordance with an operation signal input from the input unit 40, and executes processing according to the program. And CPU10 outputs the display control signal for displaying a process result to the display part 50 suitably, and displays corresponding display information.

  In the present embodiment, the CPU 10 executes main processing (see FIG. 6) according to the main program 204 of the ROM 20. Specifically, the CPU 10 causes the user to input a mathematical expression composed of components. Subsequently, the input mathematical expression is temporarily displayed on the virtual screen, and the entire temporarily displayed mathematical expression is displayed on the display screen. Further, the answer of the inputted mathematical formula is calculated, and the whole of the mathematical formula and the calculation result are displayed on the display screen.

  Further, the CPU 10 executes a first display process (see FIG. 7) according to the first display program 210 of the ROM 20 as a subroutine of the main process in FIG. Specifically, the CPU 10 determines that the vertical width of the usage range (hereinafter referred to as “temporary display usage range” as appropriate) in the virtual screen such as the mathematical formula temporarily displayed in the first display processing is the vertical direction of the display screen. When the width is exceeded, a predetermined constituent element is updated and displayed in a one-line display format from among the constituent elements included in the mathematical expression, thereby changing the display mode and displaying the entire mathematical expression on the display screen.

  Further, the mechanism by which the scientific calculator 1 displays mathematical formulas and the like will be described with reference to the drawings. FIG. 5 is a diagram showing the virtual screen V10 (dotted line portion). Here, the virtual screen is a screen formed to display a mathematical expression or the like exceeding the vertical width of the display screen W10 of the display unit 50. CPU10 displays temporarily the numerical value, numerical formula, etc. to display on the virtual screen V10. The area actually displayed on the display unit 50 is an area of the display screen W10 in the virtual screen 10, and numerical values, mathematical formulas, and the like temporarily displayed in the display area are displayed on the display unit 50. In the present embodiment, as the coordinate in the height direction of the virtual screen V10, the upper end of the screen is the coordinate P1 (first line), and the lower end of the screen is the coordinate P6 (60th line).

  The horizontal width of the display screen W10 is the same as that of the virtual screen V10. The width in the vertical direction is from the coordinate P3 of the 15th line to the coordinate P5 of the 45th line for a predetermined number of lines (for example, “30”) downward in the screen.

  Further, an integral formula is displayed on the display screen W10 of FIG. In the integral formula, the components of the mathematical formula input by the user are stored. In addition, a range used when this mathematical expression is temporarily displayed is referred to as a temporary display usage range (a chain line portion in FIG. 5).

[1.1.4 Input / output unit, etc.]
The input unit 40 is an input device including a key group necessary for inputting mathematical expressions such as numeric keys and calculation keys and selecting functions, and outputs a signal of a pressed key to the CPU 10. By means of key input in the input unit 40, input means such as input of mathematical expressions, selection of functions, and instructions for execution of calculations are realized.

  The display unit 50 displays various screens based on display signals input from the CPU 10. Here, the display screen of the display unit 50 is configured by an LCD (Liquid Crystal Display) or the like. The display screen of the display unit 50 corresponds to the display 3 shown in FIG.

  The bus 60 is a line through which an electrical signal such as data from the CPU 10 passes, and is a signal line that connects the CPU 10, the ROM 20, the RAM 30, the input unit 40, and the display unit 50.

[1.2 Process flow]
[1.2.1 Main processing]
Next, the operation of the scientific calculator 1 in the first embodiment will be described with reference to the drawings. FIG. 6 is a flowchart for explaining the operation of the scientific calculator 1 according to the main process. This main process is a process realized by the CPU 10 executing the main program 204 of the ROM 20.

  First, the CPU 10 initializes various variables, a virtual screen, and a display screen (step S10). Subsequently, the CPU 10 performs mathematical expression input processing (step S12). Here, the mathematical expression input process causes the user to input a component. And it is the process which memorize | stores the input component as a numerical formula in the numerical formula storage area 302. FIG.

  Next, the CPU 10 temporarily displays the mathematical formula stored in the mathematical formula storage area 302 on the virtual screen (step S14). Then, the CPU 10 executes a first display process (FIG. 7) as a subroutine (step S16).

  Further, the CPU 10 determines whether or not the EXE key 5c is pressed (step S18). If the EXE key 5c is not pressed (step S18; No), the CPU 10 repeatedly executes the process from step S12.

  On the other hand, when the EXE key 5c is pressed (step S18; Yes), the CPU 10 calculates the mathematical formula stored in the mathematical formula storage area 302 (step S20). Then, the CPU 10 displays the mathematical formula and the calculation result of the mathematical formula together on the virtual screen (step S22). And CPU10 performs a 1st display process again (step S24), and complete | finishes a main process.

[1.2.2 First display process]
Next, the first display process will be described. FIG. 7 is a flowchart for explaining the operation of the scientific calculator 1 according to the first display process. This first display process is a process realized by the CPU 10 executing the first display program 210 of the ROM 20, and is a process called and executed as a subroutine in steps S14 and S24 of the main process (FIG. 6). is there.

  First, the CPU 10 determines whether or not the vertical width of the temporary display usage range temporarily displayed on the virtual screen exceeds the vertical width of the display screen (step A10). Here, when it is determined that the vertical width of the temporary display usage range exceeds the vertical width of the display screen (step A10; Yes), the CPU 10 displays the functional expression among the components of the mathematical expression. According to the table 202, the corresponding part is updated and displayed in a one-line display (step A12).

  Then, the CPU 10 displays the contents temporarily displayed in the display screen area in the virtual screen on the display screen (step A14). And CPU10 complete | finishes a 1st display process and transfers a process to the predetermined | prescribed location of the main process (FIG. 6) which is an original process.

[1.3 Example of operation]
Next, an example of operation in the scientific calculator 1 when the first display process is called and executed as a subroutine from the main process will be described with reference to the drawings.

  FIG. 8A is a diagram showing the virtual screen V100 and the display screen W100 in a state where the user has input an integral formula. Since the temporary display usage range H100 is included in the display screen W100, the CPU 10 displays the mathematical formula input by the user on the display screen W100 (step S10 → step S12 → step S14 → step in FIG. 6). S16). Here, when the EXE key 5c is pressed by the user (step S18; Yes), the CPU 10 calculates a mathematical expression, and temporarily displays the calculation result on the virtual screen V100 as one of the new mathematical expression components together with the mathematical expression. (Step S20 → Step S22).

  FIG. 8B is a diagram for explaining a state where the mathematical formula and the calculation result are provisionally displayed on the virtual screen V100. In FIG. 8B, the calculation result R104 is displayed in addition to the mathematical expression. Therefore, the vertical width of the temporary display usage range H102 exceeds the vertical width of the display screen W100 (step A10 in FIG. 7; Yes). Therefore, the CPU 10 switches the corresponding component to the one-line display format based on the functional expression display table 202 and displays it (step A12). Here, as stored in the functional expression display table 202, the CPU 10 converts the first area (component R102) and the second area (component R100) into a one-line display format.

  FIG. 8C is a diagram in which the display mode of the components R100 and R102 is switched to the one-line display format. Here, the component R108 serving as the first region and the component R106 serving as the second region are updated and displayed in a single-line display format. Since the vertical width of the temporary display usage range H104 is equal to or smaller than the vertical width of the display screen W100, the display screen W100 is displayed (step A14).

[1.4 Action / effect]
As described above, according to the first embodiment, the entire formula or the entire formula and the calculation result can be displayed in the display area by changing the display mode of the preset area.

[Second Embodiment]
Next, the second embodiment will be described. In the second embodiment, when the display mode of the component is changed to the one-line display format, a process of changing and displaying based on the priority order is performed.

[2.1 Configuration]
The configuration of the scientific calculator 1 in the second embodiment is a configuration in which the ROM 20 shown in FIG. 2 in the first embodiment is replaced with the ROM 22 shown in FIG. 9, and the same components are denoted by the same reference numerals hereinafter. The description is omitted.

  The configuration of the ROM 22 will be described with reference to FIG. As shown in FIG. 9, the ROM 22 stores a function formula priority table 202b, a main program 204, and a second display program 220.

  The function formula priority table 202b is a table that stores the priority order of the components in the function formula. For example, as shown in FIG. 10, the priority order of the constituent elements in the integral functional equation is stored. In this case, the lower limit component is stored as the first priority, the upper limit component is stored as the second priority, and the component of the integrand is stored as the third.

  Here, the second display program 220 is a program for realizing the second display process in the present embodiment, and the second display process is realized by the CPU 10 executing the second display program 220. The CPU 10 executes a process of displaying the entire mathematical formula on the display screen by changing the display mode of the component from the natural display format to the one-line display format according to the priority order of the components.

[2.2 Second display process]
Next, the second display process will be described. FIG. 10 is a flowchart for explaining the operation of the scientific calculator 1 according to the second display process. This second display process is a process realized by the CPU 10 executing the second display program 220 stored in the ROM 22. Further, the CPU 10 calls and executes the second display process of the present embodiment instead of the first display process in Step S16 and Step S24 in the main process (FIG. 6). In step S10 in the main process, a process of initializing by substituting “1” for the value of the variable N is executed.

  First, it is determined whether or not the temporary display usage range displayed on the virtual screen exceeds the vertical length of the display screen (step B10). If it is determined that the vertical length of the display screen has been exceeded (step B10; Yes), the CPU 10 switches the priority order Nth component to the one-line display format and updates the display ( Step B12). And CPU10 adds "1" to the value of the variable N (step B14), and determines whether the display mode of all the components was switched (step B16). Here, when the display mode of all the components has not been switched (step B16; No), the CPU 10 repeatedly executes the processing from step B10 again.

  On the other hand, when the vertical width of the temporary display usage range is within the vertical width of the display screen in step B10 (step B10; No), the CPU 10 is temporarily displayed in the display screen area of the virtual screen. Is displayed on the display screen (step B18). Further, when all the display modes of all the components are switched in step B16 (step B16; Yes), the CPU 10 similarly displays the contents temporarily displayed in the display screen area of the virtual screen. (Step B18). And CPU10 complete | finishes a 2nd display process, and transfers a process to the predetermined | prescribed location of the main process (FIG. 6) which is an original process.

[2.3 Example of operation]
Next, an example of operation in the scientific calculator 1 when the second display process is called and executed as a subroutine from the main process will be described with reference to the drawings.

  FIG. 12A is a diagram showing a state where the user has input a mathematical expression (step S12 → step S14 → step S16 in FIG. 6). Here, when the EXE key 5c is pressed, the CPU 10 calculates the answer of the input mathematical formula, and temporarily displays the mathematical formula and the computation result together on the virtual screen V200 (step S18: Yes → Step S20 → Step S22). Here, the CPU 10 determines that the vertical width of the range used as the temporary display exceeds the vertical width of the display screen W200 (step B10 in FIG. 11; Yes). Then, the first component R200 having the priority order is changed to the one-line display format.

  Then, when it is determined that the vertical width of the temporary display usage range is within the vertical width of the display screen W200 (Step B10; No), the CPU 10 displays the contents of the virtual screen V200 on the display screen W200 ( Step B18). FIG. 12B shows the state at this time. In FIG. 12B, the component R202 is displayed in a one-line display format.

[2.4 Action and effect]
As described above, according to the second embodiment, when a component or a calculation result is further displayed from a state where a mathematical expression is displayed, the component is changed to a one-line display format according to the priority order. By displaying, the entire mathematical formula and the calculation result can be displayed on the display screen. Compared to the first embodiment, the display mode of the components necessary for entering the display screen may be changed to the one-line display format and displayed, and the entire mathematical expression is displayed in the natural display format as much as possible. Can be displayed.

[Third Embodiment]
Subsequently, the third embodiment will be described. In the third embodiment, as a change in the display mode of the component, a mathematical expression or the like is displayed within the range of the display screen by reducing the display size of the component outside the range of the display screen.

[3.1 Configuration]
The configuration of the scientific calculator 1 in the third embodiment is a configuration in which the ROM 20 shown in FIG. 2 in the first embodiment is replaced with the ROM 23 shown in FIG. 13, and the same components are denoted by the same reference numerals hereinafter. The description is omitted.

  The configuration of the ROM 23 will be described with reference to FIG. As shown in FIG. 13, the ROM 23 stores a main program 204 and a third display program 230.

  Here, the third display program 230 is a program for realizing the third display process in the present embodiment, and the third display process is realized by the CPU 10 executing the third display program 230. Specifically, the CPU 10 performs a process of displaying the entire mathematical formula on the display screen by reducing the display size (font size) of the component that is outside the range of the display screen.

[3.2 Third display processing]
Next, the third display process will be described. FIG. 14 is a flowchart for explaining the operation of the scientific calculator 1 according to the third display process. This third display process is a process realized by the CPU 10 executing the third display program 230 stored in the ROM 23. Further, the CPU 10 calls and executes the third display process of the present embodiment instead of the first display process in steps S16 and S24 in the main process (FIG. 6).

  First, the CPU 10 determines whether or not the vertical width of the temporary display use range such as a mathematical expression temporarily displayed on the virtual screen exceeds the vertical width of the display screen (step C10). Here, when it is determined that the vertical width of the display screen is exceeded (step C10; Yes), the component temporarily displayed outside the range of the display screen is specified (step C12). Then, the font of the entire specified component is reduced by one level (step C14). If the font displaying the component is not less than the minimum font (step C16; No), the CPU 10 repeatedly executes the processing from step C10.

  On the other hand, when the vertical width of the temporary display usage range becomes equal to or smaller than the vertical width of the display screen in step C10, the CPU 10 displays a mathematical expression on the display screen (step C18). And CPU10 complete | finishes a 3rd display process, and transfers a process to the predetermined | prescribed location of the main process (FIG. 6) which is an original process.

[3.3 Operation example]
Next, an operation example in the case where the third display process is executed from the main process as a subroutine in the scientific calculator 1 will be described with reference to FIG.

  FIG. 15A is a diagram for explaining a state when a mathematical expression is provisionally displayed on the virtual screen V300, and is a view when a fraction is input to the upper limit value and the lower limit value of the integral expression. Here, the vertical width of the temporary display usage range H300 on which the mathematical expression is temporarily displayed exceeds the vertical width of the display screen W300 (step C10 in FIG. 14; Yes). Therefore, the CPU 10 identifies the component R300 that is outside the range of the display screen W300 (step C12). Then, in order to change the display mode of the specified component, the display font (character font) is reduced so that the entire mathematical formula is adjusted to enter the display screen W300 (Step C14 → Step C16; No → Step C10). .

  FIG. 15B is a diagram in which the character font of the component R300 in FIG. 15A is reduced and displayed as the component R302 on the display screen W300. At this time, the vertical direction of the temporary display usage range H302 is displayed below the vertical width of the display screen W300. Further, the component R302 is displayed by reducing the component R300 of FIG.

[3.4 Actions and effects]
As described above, according to the third embodiment, it is possible to display the entire mathematical expression in the display screen in the natural display format by reducing the display size of the component that is outside the range of the display screen. Become. Then, since the component is displayed in the natural display format, the entire mathematical formula is not only displayed on the display screen but also the visibility of the user is further improved as compared with the case where the one-line display format is mixed and displayed. be able to.

[Fourth Embodiment]
Subsequently, the fourth embodiment will be described. In the fourth embodiment, mathematical expressions and the like are displayed within the range of the display screen by reducing the character fonts of the components outside the range of the display screen in a predetermined order.

[4.1 Configuration]
The configuration of the scientific calculator 1 in the fourth embodiment is a configuration in which the ROM 20 shown in FIG. 2 in the first embodiment is replaced with the ROM 24 shown in FIG. 16, and the same components are denoted by the same reference numerals hereinafter. The description is omitted.

  The configuration of the ROM 24 will be described with reference to FIG. As shown in FIG. 16, the ROM 24 stores a main program 204 and a fourth display program 240.

  Here, the fourth display program 240 is a program for realizing the fourth display process in the present embodiment, and the fourth display process is realized by the CPU 10 executing the fourth display program 240. Specifically, the CPU 10 performs a process of displaying the entire mathematical formula on the display screen by reducing the display fonts of the constituent elements according to a predetermined order.

[4.2 Fourth display process]
Subsequently, the fourth display process will be described. FIG. 17 is a flowchart for explaining the operation of the scientific calculator 1 according to the fourth display process. This fourth display process is a process realized by the CPU 10 executing the fourth display program 240 stored in the ROM 24. Further, the CPU 10 calls and executes the fourth display process of the present embodiment instead of the first display process in Step S16 and Step S24 in the main process (FIG. 6).

  First, the CPU 10 determines whether or not the vertical width of the temporary display usage range exceeds the vertical width of the display screen (step D10). When it is determined that the vertical width of the temporary display usage range exceeds the vertical width of the display screen (step D10; Yes), the CPU 10 selects the upper limit display font in the integration formula. Display to reduce (step D12).

  Similarly, the CPU 10 determines whether or not the vertical width of the temporary display usage range exceeds the vertical width of the display screen (step D14). Here, when it is determined whether or not the vertical width of the temporary display usage range exceeds the vertical width of the display screen (step D14; Yes), the CPU 10 determines the lower limit value in the integral equation. The display font is reduced (step D16).

  Further, the CPU 10 determines whether or not the vertical width of the temporary display usage range exceeds the vertical width of the display screen (step D18). When it is determined whether or not the vertical width of the temporary display usage range exceeds the vertical width of the display screen (step D18; Yes), the CPU 10 determines the integrand formula in the integral formula. The display font is reduced (step D20).

  Then, the CPU 10 displays the contents temporarily displayed on the virtual screen on the display screen (step D22), ends the fourth display process, and processes the predetermined process in the main process (FIG. 6) as the original process. To migrate.

[4.3 Operation example]
Next, an operation example when the fourth display process is executed as a subroutine from the main process in the scientific calculator 1 will be described with reference to FIG.

  FIG. 18A is a diagram for explaining a state in a case where the input mathematical formula is temporarily displayed on the virtual screen V400, and is a diagram in the case where a fraction is input to the upper limit value and the lower limit value of the integral formula. It is. Here, the vertical width of the temporary display usage range H400 exceeds the vertical width of the display screen W400 (step D10 in FIG. 17; Yes). Here, the upper limit value (component R400) of integration and the lower limit value (component R402) are provisionally displayed outside the range of the display screen W300. Therefore, the upper limit value display font and the lower limit value display font are reduced (step D10; Yes → Step D12 → Step D14; Yes → Step D16).

  FIG. 18B is a diagram in which the display fonts of the component R400 and the component R402 in FIG. 18A are reduced and displayed on the display screen W400 as the component R404 and the component R406. At this time, the vertical direction of the temporary display usage range H402 is displayed below the vertical width of the display screen W400.

[4.4 Action and effect]
As described above, according to the fourth embodiment, the entire mathematical expression can be displayed in the display screen by sequentially reducing the display sizes of the constituent elements. Compared with the third embodiment, by reducing the font size of the entire formula, the entire formula can be displayed in a balanced manner.

[Modification]
In the above-described embodiment, the scientific calculator has been described as an application example of the mathematical expression display control device. However, the arithmetic control device of the present invention is not limited to such a product, and includes a mobile phone, a personal computer, an electronic timepiece, It is also applicable to PDA (Personal Digital Assistants).

Further, it may in the embodiment described above, integration calculation does not mean has been described mainly limited thereto for, e.g., or a sum (sigma) calculated, even or a permutation _(n P _r) calculated Of course.

  In the above-described embodiment, the case where a mathematical expression is input in a natural display format as the display mode has been described. However, the present invention is not limited to this, and may be applied to a display mode such as matrix calculation. Of course.

  In the embodiment described above, it is needless to say that a dot matrix liquid crystal may be used as the display screen. In the case of dot matrix liquid crystal, instead of reducing the character font, a smaller character font may be used instead of the display object.

  This will be described below with reference to the drawings. FIG. 19 is a diagram for explaining a state in a case where the mathematical formula input on the virtual screen V500 is temporarily displayed. Here, the vertical width of the temporary display usage range H500 exceeds the vertical width of the display screen W500. Accordingly, FIG. 19B is a diagram in which the components beyond the display screen W500 are replaced with different characters.

  “1/2” included in the component R500 and the component R502 in FIG. 19A is replaced with a character representing a fraction, as shown in the component R504 and the component R506 in FIG. 19B. It is displayed. Accordingly, the vertical width of the temporary display usage range H502 is equal to or smaller than the vertical width of the display screen W500, and the mathematical formula is displayed on the display screen W500.

Overview of the scientific calculator. Block diagram of scientific calculator. The figure which shows an example of a data structure of a function type | formula display table. The figure which shows an example of the data structure of a numerical formula storage area. The figure for demonstrating a display screen. The figure which shows the operation | movement flow of the main process in 1st Embodiment. The figure which shows the operation | movement flow of the 1st display process in 1st Embodiment. The figure explaining the operation example in 1st Embodiment. The figure which shows the structure of ROM in 2nd Embodiment. The figure which shows an example of a data structure of a function type | formula priority table. The figure which shows the operation | movement flow of the 2nd display process in 2nd Embodiment. The figure explaining the operation example in 2nd Embodiment. The figure which shows the structure of ROM in 3rd Embodiment. The figure which shows the operation | movement flow of the 3rd display process in 3rd Embodiment. The figure explaining the operation example in 3rd Embodiment. The figure which shows the structure of ROM in 4th Embodiment. The figure which shows the operation | movement flow of the 4th display process in 4th Embodiment. The figure explaining the operation example in 4th Embodiment. The figure explaining the operation example in a modification.

Explanation of symbols

1 Scientific calculator 10 CPU
20 ROM
202 Function Expression Display Table 202b Function Expression Priority Table 204 Main Program 210 First Display Program 220 Second Display Program 230 Third Display Program 240 Fourth Display Program 30 RAM
302 Formula storage area 40 Input unit 50 Display unit 60 Bus

Claims (4)

Formula component input means for inputting a formula for each formula component constituting the formula,
Natural display control means for arranging each mathematical expression component input by the mathematical expression component input means at each position in a predetermined display area and displaying it in a natural display format;
When a new formula component is input by the formula component input means to the position of any formula component among the formula components arranged at each position by the natural display control means Determining means for determining whether or not the new mathematical expression component can be displayed in the natural display format in the display area;
When it is determined by the determination means that the display area cannot be displayed in the natural display format, the component of the mathematical expression component controlled to be displayed by the natural display control means is out of the display range. Display mode change control means for reducing and displaying the font ;
A mathematical expression display control device comprising:   An input means for inputting an integral formula with an upper limit value and a lower limit value;
  Natural display control means for displaying the integral formula input by the input means in a natural display format within a predetermined display area;
  Determination means for determining whether or not an integral expression displayed by the natural display control means exceeds a vertical width of the display area;
  When it is determined by the determination means that the width in the vertical direction is exceeded, the upper limit value, the lower limit value of the integral formula and the font of the integrand formula are sequentially reduced until the width of the display fits within the display width;
A mathematical expression display control device comprising: On the computer,
Formula component input function for inputting a formula for each formula component constituting the formula,
A natural display control function for arranging each mathematical formula component input by this mathematical formula component input function at each position in a predetermined display area and displaying it in a natural display format;
When a new mathematical formula component is input by the mathematical formula component input function at the position of any of the mathematical formula components arranged at each position by the natural display control function A determination function for determining whether or not the new mathematical expression component can be displayed in the natural display format in the display area;
When it is determined that the natural display format cannot be displayed in the display area by the determination function , among the mathematical expression components that are displayed and controlled by the natural display control function , A display mode change control function for reducing fonts and displaying them;
A program to realize   On the computer,
  An input function for inputting an integral expression with an upper limit value and a lower limit value;
  A natural display control function for displaying an integral expression input by this input function in a natural display format within a predetermined display area;
  A determination function for determining whether an integral expression displayed by the natural display control function exceeds a vertical width of the display area;
  A control function for sequentially reducing the upper limit value, the lower limit value, and the integrand font of the integral expression until it falls within the display width when it is determined that the vertical width is exceeded by the determination function;
A program to realize

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