MATLAB: Trying to plot function in 3D and keep getting warning

3dfunctiongraphicsMATLABmeshgridsurf

Trying to plot the function = xy(x^2-y^2)/(x^2+y^2), and keep getting Warning: Matrix is singular to working precision. The figure that comes up is empty.

     [x,y] = meshgrid(-10:.5:10,-10:.5:10);
     z = x.*y.*((x.^2-y.^2)/(x.^2+y.^2));
     surf(x,y,z)

Best Answer

Change the / to ./

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MATLAB: Try/catch warning

You didn't write histfit1, so don't worry about it. When you get to a version of MATLAB where the syntax used internally actually makes a difference, TMW will have changed their routine.

If it really bugs you, apply the solution in the release notes that the warning refers to. You can find that here

MATLAB: Warning: Matrix is singular to working precision.

The operator to inverse a matrix is inv.

If you want to divide your matrices element wise, you have to add a "." in front of "/"

% Before
f2 = X.*Y.*((X.^2 - Y.^2) / (X.^2 + Y.^2)); 
% After
f2 = X.*Y.*((X.^2 - Y.^2) ./ (X.^2 + Y.^2));

EDIT : correction thanks to @Stephen Cobeldick's comment

Best Answer

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MATLAB: Try/catch warning

MATLAB: Warning: Matrix is singular to working precision.

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