matrix multiplication error

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Fred
Fred on 7 Mar 2012
Commented: Imola Fodor on 6 Aug 2021
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.
  1 Comment
ferda sonmez
ferda sonmez on 21 Mar 2019
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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Accepted Answer

Walter Roberson
Walter Roberson on 7 Mar 2012
You could get NaN if you multiply infinity by 0. Once you have one NaN, it very often "pollutes" all the other calculations.
  3 Comments
Walter Roberson
Walter Roberson on 7 Mar 2012
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
Imola Fodor on 6 Aug 2021
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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