Problem 645. Getting the indices from a vector
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.
Given a vector, vec, return the indices where vec is greater than scalar, thresh.
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2 older comments
Kerem Kutan
on 12 Jun 2020
kinda easy
Miriam Sánchez Fernández
on 7 Nov 2020
It's easy with function "find"
Benjamin Hoehne
on 1 Dec 2020
use "find"
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Indexing II
- 22 Problems
- 160 Finishers
- Getting the indices from a vector
- Symmetry of vector
- Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
- Count consecutive 0's in between values of 1
- Find last zero for each column
- Oh Zero Zero Zero!!!
- Create an index-powered vector
- Find nth maximum
- Decimation - Optimized for speed
- Unique values without using UNIQUE function
- Symmetry of vector
- Generate a vector like 1,2,2,3,3,3,4,4,4,4
- Create an n-by-n null matrix and fill with ones certain positions
- Implement a bubble sort technique and output the number of swaps required
- Create a vector whose elements depend on the previous element
- Set a diagonal
- Unique values without using UNIQUE function
- Generate a vector like 1,2,2,3,3,3,4,4,4,4
- Change the sign of even index entries of the reversed vector
- Decimation
- Insert zeros into vector
- Reference Index Number
- Determine the number of odd integers in a vector
- Max index of 3D array
- Finding peaks
- Getting the indices from a vector
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