Problem 307. First non-zero element in each column

Created by Julio
Appears in Indexing I

Difficulty:Rate

Solve Later
Add To GroupÃ‚

For a given matrix, calculate the index of the first non-zero element in each column. Assuming a column with all elements zero is not permitted.
Example:
 in->x = [0 1 0 0;
          4 3 7 0;
          0 0 2 6;
          0 9 0 5];
 out->i = [2 1 2 3]; % row numbers

Solve

Solution Stats

2276 Solutions
871 Solvers

Last Solution submitted on Mar 20, 2025

Last 200 Solutions

Problem Comments

2 Comments

2 Comments

Ned Gulley on 5 Apr 2012

I fixed the test. There was no assert statement.

Dyuman Joshi on 29 Oct 2021

Test cases have been added.

Solution Comments

Show comments

ANNOUNCEMENT

Who Deserves Your Praise? Discover the New Contribution Widget!

We are excited to announce another update to our Discussions area: the...

Group

Indexing I

27 Problems
236 Finishers

Problem Recent Solvers871

Problem Tags

Community Treasure Hunt

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

Start Hunting!