I have a matrix $(A_{10*10})$ in which each elements of matrix states the value of the function $y=f(x,y)$. Since, $y$ shows the enclosed area between two squares, so I don't have the value of these elements in this area. Now my question is that how can I plot the $y$ in termes of $x,y$ in 2D or 3D using matlab while I don't have the values of $y$ in $A(3:5,3:5)$? Thank you in advance.
3D plot problem
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matlab