Cartesian Graph Plotting Application
by Brian Daulton

This application enables cartesian graphs to be generated in the form of Draw files. When run, an icon appears on the icon bar. Clicking on this icon opens a window, in which the function should be entered in the form Y = <function of X>. The minimum and maximum values of x and y should be entered in the next four boxes (negative or positive integers only), the x-increment should be entered as an integral number of hundredths of a unit, (preferably a factor of 100), and you can then select whether to have the grid drawn. Finally, the filename of the Draw file should be entered: note that this must be a full pathname (e.g. adfs::0.$.Graph). Clicking on OK or pressing Return in the filename field creates and saves the file. Movement between the various boxes is by using the cursor keys or pressing Return.

The axes are drawn whether or not you ask for a grid, and any vertical asymptotes are drawn as dotted lines. If you specify no grid, marks are made on the axes to help you add scales in Draw. Graphs of equations of the form Y=f(X) can be drawn by entering the function as SQR(f(X)).

Up to 5 graphs may be drawn on the same axes by entering a colon between the functions in the first window. eg. entering X-3:4*X+7 will cause the graphs of y=x-3 and y=4x+7 to be drawn on the same axes. When more than one function is specified, the one entered first is drawn with a full line and the others with a variety of dotted lines.

 RISC User 1992
