Problem 11. Back and Forth Rows

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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 ]

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Last Solution submitted on Mar 05, 2025

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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?

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Problem 11. Back and Forth Rows

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Last 200 Solutions

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Primes and Rough Numbers, Basic ideas

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Problem 11. Back and Forth Rows

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Last 200 Solutions

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Primes and Rough Numbers, Basic ideas

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