Draw a '3' in a zero matrix! - MATLAB Cody - MATLAB Central

Problem 50882. Draw a '3' in a zero matrix!

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Given a x-by-x matrix filled with zeros (x is odd and > 3). Use 3s to draw a number 3 into it! Like this:
x = 5, y =
3 3 3 3 3
0 0 0 0 3
3 3 3 3 3
0 0 0 0 3
3 3 3 3 3
x = 7, y =
3 3 3 3 3 3 3
0 0 0 0 0 0 3
0 0 0 0 0 0 3
3 3 3 3 3 3 3
0 0 0 0 0 0 3
0 0 0 0 0 0 3
3 3 3 3 3 3 3
Solve

Solution Stats

75.26% Correct | 24.74% Incorrect
Last Solution submitted on Mar 01, 2025

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Solution Comments

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Primes and Rough Numbers, Basic ideas
What is a rough number? What can they be used...
John D'Errico in Tips & Tricks
3
5
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