how to take the non zero values from one matrix and put them in another??

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I have a matrix [640 640] with few non zero values and many zeros. I want to put all the non zero values in a new matrix. Something like:
for i=1:640
for j=1:640
if A(i,j)~=0
B(i,j)=A(i,j)
end
end
end
But this doesn't work.. Any suggestions?
  1 Comment
Fangjun Jiang
Fangjun Jiang on 25 Jul 2011
What do you mean doesn't work. There is an easy way to do it which uses logic index. What value do you want for other elements in B?

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Accepted Answer

Fangjun Jiang
Fangjun Jiang on 25 Jul 2011
B=A(A~=0);

More Answers (1)

Florin Neacsu
Florin Neacsu on 25 Jul 2011
Try :
ind1=A~=0;
B(ind1)=A(ind1);
Regards, Florin

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