Fill in values in function

I have the function Z = (1.5-X+X.*Y).^2 +(2.25-X+X.*(Y.^2)).^2+(2.625-X+X.*(Y).^3).^2.

How can I calculate Z(0,0) in my code?

Answer 1

[Matt J]

Z = @(X,Y) (1.5-X+X.*Y).^2 +(2.25-X+X.*(Y.^2)).^2+(2.625-X+X.*(Y).^3).^2;

Z(0,0)

ans = 14.2031

[Annelotte]

This seems to work, but now I get an error on my surf function. Error shows this:

Error using surf (line 71)

Z must be a matrix, not a scalar or vector.

Error in GradientDescentTestFunction (line 27)

surf(X,Y,Z,'EdgeColor','none','LineStyle','none','FaceLighting','phong');

[Matt J]

Z is now a function.

surf(X,Y,Z(X,Y),'EdgeColor','none','LineStyle','none','FaceLighting','phong');