void erfcurve (x, y, npts, sym) ERFPLT.C Level 3
float *x The x data array.
float *y The y data array.
int npts The dimension of the x and y data arrays.
int sym = 0 No symbols will be plotted.
> 1 Plot symbols every sym points.
< 1 Plot symbols only.
erfcurve() plots the x and y data on an error function grid.