delete the rows will all zeros in multi-dimensional matrix

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Aravin
Aravin 2012-9-16
Dear all,
Let say I have a matrix M of size 6 x 3 x 3. And on each channel there are some zero rows (note that zero rows are evenly present in all channels). How can I remove the rows with all zeros.
For example,
M(:,:,1) =
422 397 553
0 0 0
0 0 0
476 494 520
0 0 0
0 0 0
M(:,:,2) =
0 0 0
384 494 504
0 0 0
0 0 0
385 446 474
0 0 0
M(:,:,3) =
0 0 0
0 0 0
1194 1176 1295
0 0 0
0 0 0
1202 1141 1295
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Azzi Abdelmalek
Azzi Abdelmalek 2012-9-16
编辑：Azzi Abdelmalek 2012-9-16
If you remove certain rows, your chanels will have different sizes, then you should use cell array. In this case they have the same size, but not in general

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2012-9-16
编辑：Andrei Bobrov 2012-9-16
out = reshape(M(bsxfun(@times,any(M,2),ones(1,size(M,2)))>0),[],size(M,2),size(M,3));
or only for your example
reshape(M(M>0),[],size(M,2),size(M,3))

更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-9-16
编辑：Azzi Abdelmalek 2012-9-16
for k=1:size(M,3)
A=M(:,:,k)
A(find(sum(A,2)==0),:)=[]
res{k} = num2cell(A)
end
res{:}

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