MATLAB: How to find position of value in matrix and write as another matrix

matrixmatrix positionvalue

Lets say i have this matrix
A = [1 0;
     0 0;
     1 1;
     0 1;
     0 0]
Now i want to write the positions of line of value "1" in another matrix B. In A it should start from column1. answer should be like this
B=[1 3 3 4]
which is in column1 value"1" is at 1 and 3, and in column 2 value"1" is at line 3 and 4.

Best Answer

[ii jj] = find(A);
B = ii';
Since you don't need the jj index, you can just do
[ii ~] = find(A);
B = ii';
instead.
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