MATLAB: FInd the positions of the first nonzero entry of each column.

Question

For example:

3. Let ? = (0200;0405;7100). We define ??(?) = (

3

1

4

2

).

??(?) is a column vector containing the positions of the first nonzero entry of each column.

Write a Matlab script whose input is a matrix ? and output is ??(?)

Answer 1

A=[0 2 0 0; 0 4 0 5; 7 1 0 0 ];
rc = size(A,1);%size of row
cc = size(A,2);%size of column
disp('The positions of the first nonzero entry of each column are PC =  ');
for i=1:cc
    V = A(:,i);%to get column by column
    count =0;
    countzero = 0 ;
    for j = 1:rc
        if(V(j) ~= 0)
            count = count+1;
            if(count == 1)
                  disp(j);
            end
        else if( V(j) == 0)
                countzero = countzero +1;
                if(countzero == rc)
                    disp(0);%there are no nonzero
                end
            end
        end
    end
end

i solve it after trying so many way.:)