Fill in values in function

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Annelotte 2023-1-27

编辑： Matt J 2023-1-27

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?

Matt J 2023-1-27

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 2023-1-27

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 2023-1-27

编辑：Matt J 2023-1-27

Z is now a function.

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

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