Problem 579. Spiral In

Nicholas Howe

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Create an m by n matrix filled with sequential integers starting from 1 and arranged in a counterclockwise spiral that hugs the outside border and begins in the upper left corner.

For example:

>> spiralIn(4,5)
ans =
   1    14    13    12    11
   2    15    20    19    10
   3    16    17    18     9
   4     5     6     7     8

Solve

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363 Solutions

121 Solvers

Last Solution submitted on Jan 23, 2026

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Richard Zapor on 11 May 2012

Tag "Recursion" would help in problem type classification

Ned Gulley on 11 May 2012

Richard, you can add tags whenever you want. Just click on "Add Tags".

Nicholas Howe on 17 May 2012

Good suggestion, although not all solutions proposed have been recursive. Thanks!

henry Liu on 20 Jan 2023

With the process of your coding, you'll find out more and more bugs. This is why I enjoy this problem.

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