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

Question

0 个投票

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

But this doesn't work.. Any suggestions?

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Fangjun Jiang 2011-7-25

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?

Answer 1

Fangjun Jiang 2011-7-25

1 个投票

B=A(A~=0);

Answer 2

Florin Neacsu 2011-7-25

1 个投票

Try :

ind1=A~=0;
B(ind1)=A(ind1);

Regards, Florin

Fangjun Jiang 2011-7-25

For this particular case, B would be the same as A.