Silakan dicoba
data cone;
do x = -1 to 1 by 0.01;
do y = -1 to 1 by 0.01;
z = sqrt(x**2 + y**2);
if z le 1 then output;
end;
end;
proc g3D data=cone; plot x*y=z; run;
data sadel;
do x = -1 to 1 by 0.1;
do y = -1 to 1 by 0.1;
z = sin(x)**2 + cos(y)**2;
output;
end;
end;
proc g3D data=sadel; plot x*y=z; run;
