Error when I try to use Code Analyzer suggestions

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Andrew Farsech 2015-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/260040-error-when-i-try-to-use-code-analyzer-suggestions

关闭： MATLAB Answer Bot 2021-8-20

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I get the following warning: INV is slow and inaccurate. Use A\b for INV(A)*b , and b/A for b*INV(A)

the warning happens at at these 3 lines

a = a1 + p1*Z'*inv(f1)*(vt);
p = p1 - p1*Z'*inv(f)*Z*p1;
s(t,:)   = v'*inv(f)*v;

I have tried to follow the suggestion without success. Probably I haven't understand the right equivalent syntax.

How I should write these code lines?

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jgg 2015-12-12

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It's just a warning; you don't have to fix it. The inv function, as it suggests, is slow and inaccurate. I think if I understand your code properly, the corrected version would be:

 a = a1 + ((p1*Z')/f1)*(vt);
 p = p1 - ((p1*Z')/f)*Z*p1;
 s(t,:)   = (v'/f)*v;

If you're getting an error, check the dimensions of the matrices to make sure they align.

Andrew Farsech 2015-12-13

thanks, I know that it's only a warning not an error, the error happened in calculation because I have made a mistake in the attempt to follow the hint.

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