Draw a '4' in a zero matrix! - MATLAB Cody - MATLAB Central

Problem 50907. Draw a '4' in a zero matrix!

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Given a x-by-x matrix filled with zeros (x is odd and > 3). Use 4s to draw a number 4 into it! Like this:
x = 5, y =
4 0 0 0 4
4 0 0 0 4
4 4 4 4 4
0 0 0 0 4
0 0 0 0 4
x = 7, y =
4 0 0 0 0 0 4
4 0 0 0 0 0 4
4 0 0 0 0 0 4
4 4 4 4 4 4 4
0 0 0 0 0 0 4
0 0 0 0 0 0 4
0 0 0 0 0 0 4
Solve

Solution Stats

72.37% Correct | 27.63% Incorrect
Last Solution submitted on Mar 06, 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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