MATLAB: How to know the column numbers of a matrix which contains values less than 50.

indexmatrixminimum valuethreshold

I want to know the column numbers of a matrix which contains values less than 50.

how to do this???

Let A be your row matrix.

idx = A<50 ; 
idx = find(idx)

Use can use rem() to filter the rows where the third column is multiple of 100 and then use logical indexing

M; % nx3 matrix
idx = rem(M(:,3),100)==0;
M_new = M(idx, :);

Use the reshape (link) function.