Does the surf command have plotting errors?

The following code does not produce the correct plot:

Trial>> [X,Y]=meshgrid(-2.5:0.2:2.5)
Trial>> Z=(X.^2+3*Y.^2)*exp(1-X.^2-Y.^2);
Trial>> surf(X,Y,Z)

Answer 1

[Star Strider]

You have to do element-wise multiplication in your ‘Z’ assignment:

Z=(X.^2+3*Y.^2).*exp(1-X.^2-Y.^2);
               ^ <— ADD DOT OPERATOR HERE

[X,Y]=meshgrid(-2.5:0.2:2.5);
Z=(X.^2+3*Y.^2).*exp(1-X.^2-Y.^2);

figure(1)
surf(X,Y,Z)
grid on