Problem 44342. Spot the First Occurrence of 5

Created by Peng Liu

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>This problem series invites you to solve two simple problems related to the integer NUMBER FIVE, in order to celebrate</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"https://www.mathworks.com/matlabcentral/cody/contests/1?s_tid=Cody5YA_cody_home\"><w:r><w:t>Cody's 5th birthday</w:t></w:r></w:hyperlink><w:r><w:t>.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>In this problem, let's determine the position (index) of the first occurrence of 5 along the first non-singleton dimension of an input array.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>E.g.,</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"1\"/></w:numPr></w:pPr><w:r><w:t>If the input is a vector, return the index of the first occurrence of 5.</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 5 3 5];\ny = 3;]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"1\"/></w:numPr></w:pPr><w:r><w:t>If the input is a matrix, return the index of the first occurrence of 5 in each column. If 5 is not found, simply return 0;</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[% Input x is a matrix\nx = [1 2 5\n     5 9 1\n     5 6 5];\n\n% Output y\ny = [2 0 1];]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Next problem in this series:</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"https://www.mathworks.com/matlabcentral/cody/problems/44352-the-top-5-primes\"><w:r><w:t>The Top 5 Primes</w:t></w:r></w:hyperlink></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

1374 Solutions
365 Solvers

Last Solution submitted on Jan 15, 2021

Last 200 Solutions

Problem Comments

1 Comment

1 Comment

Aaron Margolis on 19 Jun 2018

Oof that was tricky but enjoyable. Nested for loops were helpful

Solution Comments

Solution 2606089

1 Comment

1 Comment

LIFE on 29 Nov 2020

good!

Solution 1410516

1 Comment

1 Comment

GEORGIOS BEKAS on 8 Jan 2018

tough but good.
I used a cell array and the following info:
https://uk.mathworks.com/matlabcentral/answers/361968-getting-first-element-of-each-cell-array-with-different-sizes

Solution 1398402

1 Comment

1 Comment

Jafar Ala on 30 Dec 2017

How is my solution is evaluated?

Solution 1397471

1 Comment

1 Comment

Francis Naldo on 29 Dec 2017

MATLAB will not show error when using index 0 as long as it is a boolean (logicals).

Problem Recent Solvers365

Problem Tags

cody5

Community Treasure Hunt

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

Start Hunting!

Problem 44342. Spot the First Occurrence of 5

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers365

Suggested Problems

More from this Author30

Problem Tags

Community Treasure Hunt

Problem 44342. Spot the First Occurrence of 5

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers365

Suggested Problems

More from this Author30

Problem Tags

Community Treasure Hunt

Players