Problem 1451. Symmetry of vector

Created by Selvaraaju Murugesan

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Determine whether the vector is symmetric or not (vector could be even or odd in length).
For example:
 x = [1 2 3 3 2 1] is symmetric
 x = [1 2 3 4 3 2 1] is symmetric as well!
 x = [-1 -2 -3 3 2 1] is not symmetric

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Last Solution submitted on Oct 24, 2025

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Claudio Gelmi on 24 Apr 2013

Case #3 is not symmetric...please check.

Ned Gulley on 24 Apr 2013

I fixed the wording.

Andriy Nych on 2 May 2013

Why the vector from "Test Suite" "Test 3" is symmetric?

x = [-1 0 0 1];
y_correct = 1; %% WHY 1?

Ned Gulley on 2 May 2013

I updated test case #3.

Andrea Corazza on 20 Jul 2020

Hello everyone,

just a quick hint for this test: at the moment, one can pass this test simply checking whether x(1)==x(end).
However, to me at least, it makes more sense to split the check for even and odd vectors and to check if the corresponding symmetrical elements are the same or not.
If any of the pairs of elements are not equal, then we exit the cycle and we terminate with a false/0.
This is the way I figured out a robust check, otherwise it's just cheating.
KR, Andrea

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Problem 1451. Symmetry of vector

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