matrix multiplication error

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Fred 2012-3-7

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评论： Imola Fodor 2021-8-6

Hi all,

i'm doing matrix multiply and array multiply but it gives me NaN matrix what can be the reason for that? this is the equation a=xv*eye(n).*xv

thanks in advance.

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ferda sonmez 2019-3-21

Hi,

I have thw saame issue. My matrixes do not have NaN values, however, multiplication of the matrixes has NaN values? Is this situation is acceptable or am I missing something?

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Walter Roberson 2012-3-7

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You could get NaN if you multiply infinity by 0. Once you have one NaN, it very often "pollutes" all the other calculations.

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Walter Roberson 2012-3-7

any(isfinite(Matrix(:)))

will be true if there are any infinite values.

Be sure to also check

any(isnan(Matrix(:)))

which will be true if there are any NaN values.

Imola Fodor 2021-8-6

hi, I dont have infinite values - checked with any(isinf(Matrix(:))).. no Nan-s either, the columns/rows match, and i get Nan-s on the output..any firther suggestion? thank you

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