Problem 645. Getting the indices from a vector

Created by Doug Hull

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This is a basic MATLAB operation. It is for instructional purposes.

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You may already know how to find the logical indices of the elements of a vector that meet your criteria.

This exercise is for finding the index of indices that meet your criteria. The difference is this:

     vec = [11 22 33 44];
  thresh = 25;
      vi = (vec > thresh)

vi =

     0     0     1     1

What we are looking for now is how to get the values

x =

     3     4

Because those are the indices where the binary comparison is true.

Check out find.

Given a vector, vec, return the indices where vec is greater than scalar, thresh.

Solve

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3767 Solutions
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Last Solution submitted on Jul 08, 2020

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Problem Comments

3 Comments

3 Comments

goc3 on 18 Nov 2016

I added six more test cases.

Nguyen Huu Hung on 14 Sep 2019

hay

Kerem Kutan on 12 Jun 2020 at 14:18

kinda easy

Solution Comments

Solution 1936830

1 Comment

1 Comment

Umur Ulas Harman on 25 Jun 2020 at 2:14

function out = findIndices(vec, thresh)
[row,col]=find(vec>thresh);
out = col
end

Solution 1623474

2 Comments

2 Comments

Ahsan Naseer on 15 Sep 2018

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

Tavish Pattanayak on 8 May 2020

You can ask in the matlab center

Solution 382087

1 Comment

1 Comment

SJ Won on 2 Jul 2019

Can someone explain this solution to me?

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Problem 645. Getting the indices from a vector

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Problem 645. Getting the indices from a vector

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