Graph display apparatus for displaying different graphs of a functional formula based on inputted coefficient data

• US 5,539,867 A
• Filed: 11/22/1994
• Issued: 07/23/1996
• Est. Priority Date: 11/30/1993
• Status: Expired due to Term

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: Nakano, Yukihiro, Arikawa, Kazuhiko, Handa, Akihiro, Negishi, Osamu
• Primary Examiner(s): Jankus, Almis R.
• Application Number:
  US08/343,768
• Time in Patent Office: 609 Days
• Field of Search: 395/140, 395/155, 395/157, 395/161, 364/710.01-710.14
• US Class Current: 345/440
• CPC Class Codes: G06F 40/18 of spreadsheets form-filling G06F40/174

Abstract

A graph display apparatus wherein a dynamic invention has the following arrangement. A dynamic graph key in a key input unit is operated by a user and a functional formula subjected to graph calculation and a change range and a change pitch of a coefficient value present in the functional formula input using numeric. symbol keys are stored in a formula register in a RAM (Random Access Memory). When an execution key is operated in a state wherein a coefficient change speed is stored in a register, the coefficient value of the functional formula is sequentially replaced within the change range at the change pitch. Graphic data of the functional formula and corresponding graph formulas with the changes in coefficients are sequentially stored in a plurality of video memory areas in a VRAM (Video Random Access Memory), and graphs and corresponding graph formulas for the changes in coefficients are sequentially read out in accordance with the coefficient change speed to be sequentially switched and displayed on a display unit. When the coefficient present in the formula is changed as a parameter, the graphs corresponding to the formulas are sequentially displayed, thus easily grasping the graph change state with the change in coefficient.

Claims

1. A graph display apparatus comprising:

formula storage means for storing formula data including at least coefficient data and variable data;

coefficient range storage means for storing data indicating a range within which the coefficient data changes;

graph storage means for storing in individual areas thereof graph data respectively obtained by changing, within the range stored in the coefficient range storage means, the coefficient data with respect to the formula data stored in the formula storage means;

time interval data storage means for storing time interval data; and

graph display means for sequentially switching and displaying the graph data stored in the individual areas of the graph storage means with a time interval based on the time interval data stored in the time interval data storage means.

2. An apparatus according to claim 1, wherein:

the data indicating the range, stored in said coefficient range storage means, includes at least minimum value data and maximum value data; and

said graph display means further comprises display control means for changing the coefficient data from one of the minimum value and the maximum value in a change order to switch and display the graph data in the change order.

3. An apparatus according to claim 1, wherein:

the formula data includes quadratic functional formula data using Y and X as variables, and

the data indicating the range, stored in said coefficient range storage means, is coefficient data of X².

4. An apparatus according to claim 1, wherein said graph display means comprises a dot-matrix display unit.

5. An apparatus according to claim 1, further comprising setting means for setting the time interval data stored in said time interval data storage means.

6. An apparatus according to claim 1, wherein said graph display means comprises formula display means for displaying a formula of a displayed graph.

7. A graph display apparatus comprising:

input means for inputting formula data including at least coefficient data and variable data, and data indicating a range within which the coefficient data changes;

storage means for storing the formula data input by the input means, and for storing the inputted data indicating the range within which the coefficient data changes input by the input means;

arithmetic means for changing a coefficient of the formula data stored in the storage means within said range to obtain a plurality of graphic data;

graphic data storage means for storing in individual areas thereof the plurality of graphic data obtained by changing the coefficient by the arithmetic means;

time interval data storage means for storing time interval data; and

graph display means for sequentially switching and displaying the graphic data stored in the individual areas of the graphic data storage means with a time interval based on the time interval data stored in the time interval data storage means.

8. An apparatus according to claim 7, wherein the data indicating the range, stored in said storage means, includes at least minimum value data and maximum value data;

and

said arithmetic means comprises means for changing the coefficient of the formula data from one of the minimum value and the maximum value in a change order to obtain the graphic data in the change order.

9. An apparatus according to claim 7, wherein;

the formula data includes quadratic functional formula data using Y and X as variables; and

the data indicating the range is coefficient data of X².

10. An apparatus according to claim 7, wherein said graph display means comprises a dot-matrix display unit.

11. An apparatus according to claim 7, further comprising setting means for setting the time interval data stored in said time interval data storage means.

12. An apparatus according to claim 7, wherein said graph display means comprises formula display means for displaying a formula of a displayed graph.

13. A graph display apparatus comprising:

formula storage means for storing formula data including at least coefficient data and variable data;

coefficient range storage means for storing data indicating a range within which the coefficient data changes;

change pitch storage means for storing change pitch data of the data indicating the range within which the coefficient data changes stored in the coefficient range storage means;

setting means for respectively setting (i) the formula data to be stored in the formula storage means, (ii) the data indicating the range within which the coefficient data changes to be stored in the coefficient storage means, and (iii) the change pitch data to be stored in the change pitch storage means; and

graph display means for changing a coefficient of the formula data stored in the formula storage means within data indicating the range stored in the coefficient range storage means for the change pitch data stored in the change pitch storage means, to display a graph.

14. An apparatus according to claim 13, wherein said graph display means comprises;

arithmetic means for calculating a plurality of graphic data obtained by changing the coefficient of the formula data within said range for each change pitch data stored in said change pitch storage means; and

switching display means for switching and displaying the plurality of graphic data calculated by said arithmetic means.

15. An apparatus according to claim 14, further comprising setting means for presetting a switching time interval of a graph display by said switching display means.