Problem 59. Pattern matching

Given a matrix, m-by-n, find all the rows that have the same "increase, decrease, or stay same" pattern going across the columns as the first row does. Do not list the row as a match to itself.

Example:

 Input  a = [1 2 3 0
             5 6 7 9
             2 7 8 7]
 Output b is 3

since the third column follows the increase-increase-decrease pattern used in vector a.

Solve

Solution Stats

52.95% Correct | 47.05% Incorrect
Last Solution submitted on Jan 12, 2026

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers2816

Suggested Problems

More from this Author96

Problem Tags

indexing

Community Treasure Hunt

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

Start Hunting!