例子
data a;
do i=1 to 100;
x=normal(0);
y=2*uniform(0);
output;
end;
do j=700 to 1000;
z=3*uniform(0);
w=4*uniform(0);
output;
end;run;
proc plot vpercent=25 hpercent=50;
plot (x y)*i='o';
plot (z w)*j='k';
run;