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finding and storing non zero elements in a NxN matrix

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Anantha Padmanabhan
回答： Jos (10584) 2014-10-2
Hi, I would like to know how i can determine the non zero elements in a matrix consisting mostly of zeros and store its matrix coordinate positions. So in a 64*64 matrix i can determine the non zero elements by making a for loop like this for ix=1:n
for iy=1:n
if newpositions(ix,iy)==0
%nah u alrite
else
newpsi(ix,iy)=%%%here i want to store the ix and iy elements in an array instead of storing them in a huge ix*iy matrix
end
end
end

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回答（2 个）

José-Luis
José-Luis 2014-10-1
doc sparse
Jos (10584)
Jos (10584) 2014-10-2
help find
M = rand(5) < 0.2 ; % some data
[r,c,v] = find(M) ; % row and column indices of non-zero elements (with values v)

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