Problem 11. Back and Forth Rows

Created by Cody Team

Difficulty:Rate

Solve Later
Add To GroupÃ‚

Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the examples below.

Examples:

 Input  n = 3
 Output a = [ 1 2 3
              6 5 4
              7 8 9 ]

 Input  n = 4
 Output a = [ 1     2     3     4
              8     7     6     5
              9    10    11    12
             16    15    14    13 ]

Solve

Solution Stats

17534 Solutions
6929 Solvers

Last Solution submitted on Nov 18, 2025

Last 200 Solutions

Problem Comments

16 Comments

16 Comments

Show 13 older comments

Sharon Spelt on 8 Nov 2018

It appears a '\r' is needed after the %% in the first test of the solution to make it process properly.

goc3 on 9 Nov 2018

The problem with the first test case has been fixed here.

Aleksandrov Igor on 14 Jan 2020

This code
b=vec2mat(1:n^2,n)
b(2:2:end,:)=fliplr(b(2:2:end,:))
work in Matlab, why it doesn't works on site?

Solution Comments

Show 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 Solvers6929

Problem Tags

Community Treasure Hunt

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

Start Hunting!

Problem 11. Back and Forth Rows

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Join Cody Contest 2025 — Have Fun and Win Prizes!

Problem Recent Solvers6929

Suggested Problems

More from this Author96

Problem Tags

Community Treasure Hunt

Problem 11. Back and Forth Rows

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Join Cody Contest 2025 — Have Fun and Win Prizes!

Problem Recent Solvers6929

Suggested Problems

More from this Author96

Problem Tags

Community Treasure Hunt

Players