3-D Plot © 1973 DEC [Digital Equipment Corp.]
Will plot the family of curves of any function. The function Z is plotted as rising out of the x-y plane with x and y inside a circle of radius 30. The resultant plot looks almost 3-dimensional.
You set the function you want plotted in line 5. As with any mathematical plot, some functions come out prettier than others.
Published in July 1973 as a type-in program in the 101 BASIC Computer Games book.