matrix multiplication error

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.

[ferda sonmez]

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?

Answer 1

[Walter Roberson]

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

[Fred]

i'm guessing probably i am not suppose to have infinity but my matrix is 24x2100 size so should i check all elements by one by if it they are infinity or not?

is there any other easy way to do that?

[Walter Roberson]

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]

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