Problem 1448. Create Volcano (or Atoll) martix. It is an extension of Bullseye matrix problem.

Chintan

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For example, if n=2 (maximum value), the output matrix should be
 [1 1 1 1 1;
  1 2 2 2 1;
  1 2 1 2 1;
  1 2 2 2 1;
  1 1 1 1 1]
where you go from inside to outside starting from 1 to 2(maximum value) and again move back from 2 to 1.

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Last Solution submitted on Jun 08, 2026

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Ned Gulley on 24 Apr 2013

You should call this a volcano matrix!

Richard Zapor on 27 Apr 2013

Could also be named an Atoll matrix

Chintan on 27 Apr 2013

Thanks Ned, Richard for good suggestion. I have changed Problem Title accordingly.

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