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I have a matrix, named as p_c_w having dimensions 6X7599 and the other matrix named as p_w having dimensions 1X7599. I wish to have their element-wise multiplication but I am unable to do that. For size of rows of p_c_w and columns of p_w to be same, I have taken transpose of p_c_w and stored it in anss. Error I am receving is: Subscripted assignment dimension mismatch.

Code is below. Can anyone please help?

Thanks a lot in advance

anss=p_c_w' for i=1:size(anss,1) for j=1:size(p_w,2) temp(j,i)=anss(i,j).*p_w(j); end end
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  • use p_w(1,j) instead of p_w(j) Commented Mar 6, 2014 at 9:39

2 Answers 2

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use bsxfun:

A = [ 1 2 3 4 5; 1 2 3 4 5; 1 2 3 4 5 ]; B = [ 1 10 100 1000 10000]; C = bsxfun(@times,A,B)

returns:

C = 1 20 300 4000 50000 1 20 300 4000 50000 1 20 300 4000 50000

Works the same for A' with B'

so for your case:

temp = bsxfun(@times,p_c_w,p_w)
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Thanks @thewaywewalk It has worked now using bsxfun :)
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From R2016b release, you do not need to use bsxfun for this operation. For example, the following code will do the same thing as @thewaywewalk's answer.

A = [ 1 2 3 4 5; 1 2 3 4 5; 1 2 3 4 5 ]; B = [ 1 10 100 1000 10000]; C = A.*B

Check out doc for implicit expansions.

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