finding the columns include ones

matrix=[1 0 0 1 0;0 1 0 1 0];

% I need to find the number of column includes [1;1]

index_1 = 4 ;

% how can I find this using code or function?

Answer 1

[madhan ravi]

 index = find(all(matrix)) % one can directly use logical indexing without find() function