看看这个可行

data a;
w=0.1;
do n=1 to 50;
do m=1 to 50;
do x=0.1 to 5 by w;
y=probf(x+w,n,m)-probf(x,n,m);
output;end;end;end;
proc sort;by x m n;run;
proc gplot;
plot y*x/overlay ctext=blue nofr;
symbol i=spline color=red width=8;
run;