akcs.mitchell@hpcvbbs.UUCP (Mitchell Dickerman) (12/11/90)
Long ago, I had a wonderful program that plotted relations, i.e. if you gave it X^2+Y^2-1, it drew the unit circle. I would love to see a program like this for my 48, but I'm not much of a programmer. In order to plot f(x,y)=0, one would have to begin with the pixel in the upper left hand corner, and check the 3 adjacent pixels and compare the sign of f(x,y) evaluated at those points. If a sign change occured, it indicates a solution of f(x,y)=0, and that pixel should be turned on. Am I making sense? Can someone give me a hand implementing this? Mitch