Problem 1451. Symmetry of vector

Created by Selvaraaju Murugesan

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Determine whether the vector is symmetric or not (vector could be even or odd in length).</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>For example:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ x = [1 2 3 3 2 1] is symmetric\n\n x = [1 2 3 4 3 2 1] is symmetric as well!\n\n x = [-1 -2 -3 3 2 1] is not symmetric]]></w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Solve

Solution Stats

1345 Solutions
531 Solvers

Last Solution submitted on Jan 24, 2022

Last 200 Solutions

Problem Comments

5 Comments

5 Comments

Show 2 older comments

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

Solution Comments

Solution 1747081

1 Comment

1 Comment

Paul Dostert on 10 Mar 2019

Include a test case where first and last are same, but ones in middle aren't (say [1 2 4 3 5 2 1])

Solution 1593480

1 Comment

1 Comment

A C on 27 Jul 2018

I need to learn more.

Solution 239378

1 Comment

1 Comment

Andriy Nych on 2 May 2013

What if you update the test #3 in test suite?

Problem Recent Solvers531

Problem Tags

basic matlab

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 1451. Symmetry of vector

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers531

Suggested Problems

More from this Author9

Problem Tags

Community Treasure Hunt

Problem 1451. Symmetry of vector

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers531

Suggested Problems

More from this Author9

Problem Tags

Community Treasure Hunt

Players