delete the rows will all zeros in multi-dimensional matrix

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

[asd]

you are asking for a single command or a code?

[Aravin]

Single command.

[Azzi Abdelmalek]

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

Answer 1

[Andrei Bobrov]

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))

Answer 2

[Azzi Abdelmalek]

      for k=1:size(M,3)
          A=M(:,:,k)
          A(find(sum(A,2)==0),:)=[]
          res{k} = num2cell(A)
      end
      res{:}

[adameye adameye]

will have problem if one row is -5 +5 0