Finding second smallest element in a row.

357 views (last 30 days)
I have a row
X = [441 137 594 507 417 581 312 362 263 151 472 512 129 70 298 255 442 574 289 157 0];
I want to find the second smallest (non zero) element from X along with the column number.

Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 29 Aug 2016
Edited: Azzi Abdelmalek on 29 Aug 2016
X = [441 137 594 507 417 581 312 362 263 151 472 512 129 70 298 255 442 574 289 157 0];
out=min(setdiff(X,min(X)))
or
M=sort(X)
out=M(2)
  2 Comments
Azzi Abdelmalek
Azzi Abdelmalek on 29 Aug 2016
X = [441 137 594 507 417 581 312 362 263 151 472 512 129 70 298 255 442 574 289 157 0];
[out,idx]=sort(X)
val=out(2)
index=idx(2)

Sign in to comment.

More Answers (1)

Guillaume
Guillaume on 29 Aug 2016
If by 2nd smallest you mean 2nd smallest distinct value:
A = [1 0 1 2 1 4 2 3];
uA = unique(nonzeros(A)); %does sorting and remove duplicates
small2distinct = uA(2)
If by 2nd smallest you do mean 2nd smallest, so if the minimum is repeated twice, you do want the minimum:
A = [1 0 1 2 1 4 2 3];
sA = sort(nonzeros(A)); %then use plain sort
small2 = sA(2)
So, nonzeros to get all the non zero values, then sort or unique to sort the values, then take the 2nd one.

Community Treasure Hunt

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

Start Hunting!

Translated by