This package consists of two main programs, the first a fairly sophisticated program for drawing cartesian graphs of mathematical functions with parametric option and entry of asymptotic values; and the second enables the user to design and draw graphs of polar equations.

The screen display will only support one-colour cartesian graphs but the user can select the graphics colour.

Both programs are useful for demonstration and interactive learning because the user has an immediate visual feedback of the effects any parameter change has on the shape of the graph. The screen display is easy to set up and the screen instructions clear but more thought should be given to the booklet.

During the graph drawing a continuous X-Y coordinate readout along with information regarding axes range and functions are shown on the screen. Text may be placed anywhere on the screen and displays may be dumped to a printer.

There were a number of program errors which prevented me from using the circle drawing option and I could not change any of the functions in the polar plotting option until I delved into the listing.

J.H.D.