#include <math.h> #include#include <chplot.h> int main() { int numpoints = 100; array double x[numpoints], y[numpoints]; linspace(x, -10, 10); x = x+(x==0)*FLT_EPSILON; /* if x==0, x becomes gifilon */ y = sin(2*x)./x; plotxy(x, y, "y=sin(x)/x", "x", "y"); }