Problem 876. Sum the entries of each column of a matrix which satisfy a logical condition.

Given a numeric matrix A and a logical array L of the same size as A, return a row vector S containing the columnwise sums of the entries of A which satisfy L (i.e. where there is a true value in the logical array L). If L contains a column of false values, then the corresponding entry of S should be zero.


1) If A = [1, 2; 3, 4] and L = [true false; false true], then S should be the row vector [1 4].

2) If A = triu(ones(3)) and L = logical(A), then S should be the row vector [1 2 3].

3) If A = repmat(1:3, 3, 1) and L = [false(3,1), true(3, 2)], then S should be the row vector [0 6 9].

Solution Stats

45.69% Correct | 54.31% Incorrect
Last Solution submitted on Jun 01, 2024

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers158

Suggested Problems

More from this Author4

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!