MATLAB: Putting the answer in a matrices

arraymatrix

I have matrix a. Then, I find which column in each row has number bigger than 1. The code is as below
a =
     5     0     0     0     0     0     0     0     0     0
     3     1     0     0     0     0     0     0     0     0
     1     2     0     0     0     0     0     0     0     0
     1     0     1     0     0     0     0     0     0     0
>> for cpart=1:size(a,1)
b=a(cpart,:);
row = find(b ~=0)
end
row =
     1
row =
     1     2
row =
     1     2
row =
     1     3
How can I put the row in a matrices ?(as shown below)
     row = [1 0
            1 2
            1 2
            1 3]

Best Answer

With a loop:
nA     = (a ~= 0);
nRow   = size(a, 1);
nCol   = max(sum(nA, 2));
result = zeros(nRow, nCol);  % Pre-allocation
for c = 1:nRow
    v = find(nA(c, :));
    result(c, 1:numel(v)) = v;
end
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