Graph display control apparatus, graph display control method, and recording medium storing graph display control program

A graph display control method of an electronic device having a display and a memory, comprising:

• storing a function equation in the memory;
• displaying a graph corresponding to the function equation stored in the memory on a coordinate system of the display;
• designating a plurality of points on the graph displayed on the display, in response to user's operations;
• obtaining a slope value of a tangent to the displayed graph at each coordinate corresponding to each of the plurality of designated points;
• plotting the corresponding slope values as one value of a coordinate on the coordinate system;
• performing regression calculation based on the plurality of plotted points to obtain a regression function equation of a graph corresponding to the plurality of plotted points;
• and
• displaying a graph corresponding to the regression function equation obtained by the regression calculation.

A non-transitory computer readable storage medium having stored therein instructions, which when executed by a device having a display and a memory, cause the device to function as units comprising:

• a function equation storing unit that stores a function equation in the memory;
• a graph display unit that controls the display to display a graph corresponding to the function equation stored in the memory on a coordinate system of the display;
• a graph point designating unit that designates a plurality of points on the graph displayed on the display, in response to user's operations;
• a slope coordinate plotting unit that obtains a slope value of a tangent to the displayed graph at each coordinate corresponding to each of the plurality of designated points and that plots the corresponding slope values as one value of a coordinate on the coordinate system;
• a regression calculation unit that performs regression calculation based on the plurality of points plotted by the slope coordinate plotting unit to obtain a regression function equation of a graph corresponding to the plurality of plotted points;
• and
• a regression graph display unit that controls the display to display a graph corresponding to the regression function equation obtained by the regression calculation of the regression calculation unit.