Problem 645. Getting the indices from a vector

Created byDoug Hull

Like (39)

Solve Later

{“关系”:[{“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 is a basic MATLAB operation. It is for instructional purposes.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><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>You may already know how to</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"//www.tianjin-qmedu.com/matlabcentral/cody/problems/640-do-a-binary-comparison-on-a-vector\"><w:r><w:t>find the logical indices</w:t></w:r></w:hyperlink><w:r><w:t> of the elements of a vector that meet your criteria.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>This exercise is for finding the index of indices that meet your criteria. The difference is this:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ vec = [11 22 33 44];\n thresh = 25;\n vi = (vec > thresh)\n\nvi =\n\n 0 0 1 1]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>What we are looking for now is how to get the values</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ x =\n\n 3 4]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Because those are the indices where the binary comparison is true.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Check out</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"//www.tianjin-qmedu.com/help/techdoc/ref/find.html\"><w:r><w:t>find</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>Given a vector, vec, return the indices where vec is greater than scalar, thresh.</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

10310 Solutions
5836 Solvers

LastSolutionsubmitted on Jul 01, 2022

Last 200 Solutions

Problem Comments

5 Comments

5 Comments

Show 2 older comments

goc3on 18 Nov 2016

I added six more test cases.

Nguyen Huu Hungon 14 Sep 2019

hay

Kerem Kutanon 12 Jun 2020

kinda easy

Miriam Sánchez Fernándezon 7 Nov 2020

It's easy with function "find"

Benjamin Hoehneon 1 Dec 2020

use "find"

Solution Comments

Solution 6810970

1 Comment

1 Comment

Josh Klueberon 2 Nov 2021

good problem

Solution 6704236

Solution 6012825

1 Comment

1 Comment

Kossel E. LEGUEZIMon 25 Jun 2021

Nice problem!

Solution 5670635

1 Comment

1 Comment

john perkinson 4 May 2021

very cool problem

Solution 5420785

1 Comment

1 Comment

TIMOTHY PIERGIOVANNIon 21 Apr 2021

find() function

Solution 3899893

1 Comment

1 Comment

Qingyin Zhangon 29 Nov 2020

out=find(vec>thresh);

Solution 3579645

Solution 3012838

1 Comment

1 Comment

Isabella Stellitano202年11月4日1

good problem

Solution 1623474

2 Comments

2 Comments

Ahsan Naseeron 15 Sep 2018

my solution is incorrect.how would i get the exact solution?

Tavish Pattanayakon 8 May 2020

You can ask in the matlab center

Problem Recent Solvers5836

Problem Tags

Community Treasure Hunt

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

Start Hunting!

Problem 645. Getting the indices from a vector

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers5836

Suggested Problems

More from this Author51

Problem Tags

Community Treasure Hunt

Problem 645. Getting the indices from a vector

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers5836

Suggested Problems

More from this Author51

Problem Tags

Community Treasure Hunt

Players