Warning message when creating surface plot.

Question

Leaysia Lampkin 2023-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/1898500-warning-message-when-creating-surface-plot

评论： Voss 2023-1-22

I was working on a code that will produce a scatter plot for the following equation, Z = sin(sqrt(X * X + Y * Y)) / (sqrt(X * X + Y * Y)). When writting it in matlab, I get to the last line of my code and I get this error "Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 7.112887e-37.". I changed the values in my linspace values thinking that was the issue but I got the same error.

Here is my code:

>> xg = linspace (-10,10,25);

>> [X,Y] = meshgrid (xg,xg);

>> Z = sin(sqrt(X * X + Y * Y)) / (sqrt(X * X + Y * Y + eps));

Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 7.112887e-37.

I do know that in order for a surface plot to prodoce I need to use "surf(X,Y,Z)". I got stuck trying to find a work around for this message. Is it because of my linspace or is it with the formula I am trying to enter?

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Leaysia Lampkin 2023-1-22

For context, the function eps was added to the starting formula, to avoid the outcome of when X and Y both equal 0. The inital formula is Z = sin(sqrt(X * X + Y * Y)) / (sqrt(X * X + Y * Y)) .

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