Problem 42633. Cumulative maximum of an array

• Created by Matthew Eicholtz
• Appears in 2 groups

×

By solving this problem, you will make progress in the following group(s)

Matrix Manipulation III

• 20 Problems
• 27 Finishers

Tough Stuff

• 19 Problems
• 8 Finishers

Like (1)

Difficulty:

(20)

Rate

• Solve Later   
• Add To GroupÂ

Find the cumulative maximum of an array without using the built-in function cummax (and a few others). Your function should act identically to cummax, allowing the same inputs.

Examples

If X = [0 4 3

6 5 2]

cumax(X,1) is [0 4 3 and cumax(X,2) is [0 4 4

6 5 3] 6 6 6]

cumax(X,1,'reverse') is [6 5 3 and cumax(X,2,'reverse') is [4 4 3

6 5 2] 6 5 2]

Also,

cumax([8 9 1 10 6 1 3 6 10 10]) returns [8 9 9 10 10 10 10 10 10 10]

cumax([8 9 1 10 6 1 3 6 10 10]') returns [8 9 9 10 10 10 10 10 10 10]'

See also cumin.

Solve

Solution Stats

17.36% Correct | 82.64% Incorrect

• 242 Solutions
• 39 Solvers

Last Solution submitted on Oct 22, 2025

Last 200 Solutions

Solution Comments

ANNOUNCEMENT ×

Join Cody Contest 2025 — Have Fun and Win Prizes!

We’re excited to invite you to Cody Contest 2025! 🎉 Pick a team,...

Problem Recent Solvers39

Suggested Problems

• Find the longest sequence of 1's in a binary sequence.

  6551 Solvers

• Create times-tables

  18645 Solvers

• Find the peak 3n+1 sequence value

  2543 Solvers

• intersection of matrices

  629 Solvers

• Parallel vectors

  148 Solvers

More from this Author44

• Find mistyped words in text (mixed-up letters)

  174 Solvers

• Find the maximal cliques in an undirected graph

  5 Solvers

• Return elapsed time

  23 Solvers

• Determine which fields have been modified in a structure

  23 Solvers

• SET (the card game)

  50 Solvers