PRO graf1,fce,x1,x2 ; ; Graphic demonstration of a function y=f(x), given as a string. ; Michal. x=fltarr(101) for i=0,100 do x(i)=x1+i*(x2-x1)/100. r=execute(fce) if r ne 1 then stop,' ERROR, STOPPED. Type RETALL' plot,x,y,background=255,color=0 END