Problem 44063. Make a rainbow matrix (follow-up to checkerboard matrix)

Created by Jihye Sofia Seo

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Given an integer n, make an n-by-n matrix as shown below. The a(1,1) should be 0. As we move away from the top-left, the number increase by 1, until we hit a diagonal, where all the elements are (n-1) along the diagonal. After passing diagonal, the number increases by 1 each time.This is a follow-up question to Cody Challenge CheckerBoard Problem at <a href = "https://www.mathworks.com/matlabcentral/cody/problems/4-make-a-checkerboard-matrix">https://www.mathworks.com/matlabcentral/cody/problems/4-make-a-checkerboard-matrix</a>For n=10<pre> Input n = 10
 Output a is
 [0 1 2 3 4 5 6 7 8 9
 1 2 3 4 5 6 7 8 9 8
 2 3 4 5 6 7 8 9 8 7
 3 4 5 6 7 8 9 8 7 6
 4 5 6 7 8 9 8 7 6 5
 5 6 7 8 9 8 7 6 5 4
 6 7 8 9 8 7 6 5 4 3
 7 8 9 8 7 6 5 4 3 2
 8 9 8 7 6 5 4 3 2 1
 9 8 7 6 5 4 3 2 1 0]</pre>

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115 Solutions
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Last Solution submitted on Nov 15, 2022

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1 Comment

goc3 on 31 Jul 2018

Additional test cases have been added.

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Solution 1119624

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1 Comment

Jihye Sofia Seo on 10 Feb 2017

I am new to MATLAB and this was first problem I created. So happy to see variety of solutions I could not think of! Thanks and enjoy coding!

Solution 1119294

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1 Comment

Jihye Sofia Seo on 10 Feb 2017

Bravo! You are the leading solver!
I didn't know "rot90" before. I was looking for it. Thanks!
(I solved this problem with different function.)

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Problem 44063. Make a rainbow matrix (follow-up to checkerboard matrix)

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Problem 44063. Make a rainbow matrix (follow-up to checkerboard matrix)

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