# How to find same values in an array and their index

1 view (last 30 days)
University on 13 Nov 2023
Commented: University on 13 Nov 2023
Hi,
I have array with some repeated values. I have 1e-6 repeatedly. How can I have find all the values and their corresponding index?

Dyuman Joshi on 13 Nov 2023
Moved: Dyuman Joshi on 13 Nov 2023
arr = struct with fields:
yintercept: [100×2 double]
mat = arr.yintercept
mat = 100×2
1.0e-06 * 1.0000 0 1.0000 0 1.0000 0 0.1280 1.0000 0.1300 1.0000 0.1319 1.0000 0.1338 1.0000 0.1357 1.0000 0.1375 1.0000 0.1393 1.0000
val = 1e-6;
%As you are dealing with floating point numbers, use tolerance to compare
[r, c] = find(abs(mat-val)<1e-9)
r = 100×1
1 2 3 18 25 39 41 42 43 44
c = 100×1
1 1 1 1 1 1 1 1 1 1
University on 13 Nov 2023
Thanks for your response. Sorry I attached a wrong array. I have 1e-6 repeatedly. How can I have find all the values and their corresponding index?

### Categories

Find more on Matrix Indexing in Help Center and File Exchange

R2023a

### Community Treasure Hunt

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

Start Hunting!