How to find the number of ones in each column of a logical matrix?

How to find the number of ones in each column of a logical matrix?

Answer 1

[Star Strider]

Use the sum function.

Example:

A = logical(randi([0 1], 10,5));                    % Create Data
Ones_In_Each_Column = sum(A)                        % Sum The Columns

EDIT — Added ‘Example’ code.

[Rightia Rollmann]

In a for loop? Cannot the sum function do it alone?

[Star Strider]

There is no loop! The sum function is doing it alone.

I created the logical ‘A’ matrix to demonstrate that the code works. Then the sum call in the ‘Ones_in_Each_Column’ assignment creates a row vector that are the sums of the numbers of ones in each column.

[Rightia Rollmann]

Gotcha! Thanks!

[Star Strider]

My pleasure!