Triangular matrices in 3D array - MATLAB Cody - MATLAB Central

Problem 1704. Triangular matrices in 3D array

Difficulty:
(20)
Rate

Given a 3D numeric array x, return an array y of the same size in which all entries to the right of the main diagonal are zero for y(:,:,i).

Example

If

x(:,:,1) = 1 2 3
           4 5 6
           7 8 9

x(:,:,2) = 1 4 7
           2 5 8
           3 6 9

x(:,:,3) = 1 2 3
           1 2 3
           1 2 3

then

y(:,:,1) = 1 0 0
           4 5 0
           7 8 9

y(:,:,2) = 1 0 0
           2 5 0
           3 6 9

y(:,:,3) = 1 0 0
           1 2 0
           1 2 3
Solve

Solution Stats

69.2% Correct | 30.8% Incorrect
Last Solution submitted on Jun 23, 2025

Problem Comments

Solution Comments

Show comments
Why should you share code?
In a discussion on LInkedin about my recent blog post, Do these...
Mike Croucher in General
3
6
View Post

Problem Recent Solvers135

Suggested Problems

More from this Author44

Community Treasure Hunt

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

Start Hunting!