Patent ID: 6891541

Claim:
A graphing calculator that provides a manual line drawing function, comprising: a screen capable of displaying at least straight lines in any direction and a cursor; a key panel having direction keys at least capable of selecting positions of said cursor and moving said cursor horizontally or vertically on said screen; a processor for executing manual line fit programming that instructs said processor to perform the following steps to allow the user to manually position a line on said screen; receive a plurality of data points and generate a plot of said data points on said screen; receive a line begin point, receive a line end point, draw a line on said screen that includes said begin point and said end point, and allow the user to manually position said line to using said direction keys to identify a new line location; and a memory for storing said manual line fit programming, wherein said processor is further programmed to receive a set of data points and to generate a scatter plot of said data points, such that said line may be drawn on said scatter plot.