Sort a table with different orders for different columns

19 views (last 30 days)
Assume table A:
A = [
'k' 2 4
'a' 3 8
'a' 4 5
'k' 2 2
'a' 3 16
'k' 9 3
'k' 9 8
'a' 4 6
]
If i use sortrows(A) every column is sorted with ascending order:
A = [
'a' 3 8
'a' 3 16
'a' 4 5
'a' 4 6
'k' 2 2
'k' 2 4
'k' 9 3
'k' 9 8
]
Is there a way to sort rows, so first and second column is sorted with ascending order, but third one with descending? I want to get something like this:
A = [
'a' 3 16
'a' 3 8
'a' 4 6
'a' 4 5
'k' 2 4
'k' 2 2
'k' 9 8
'k' 9 3
]
  3 Comments
Karol Buchajczuk
Karol Buchajczuk on 31 Mar 2021
I want to sort by first column in ascending order, then second in ascending order, then third in descending, so like in example, sortrows is sorting first column, so 'a's are before the 'k's, then for every 'a' it sorts second column, so 'a' 3 is before 'a' 4 etc. My problem is sortrows sorts it by (asc,asc,asc) and I want it sorted by (asc,asc,desc).
Star Strider
Star Strider on 31 Mar 2021
It would likely be necessary to sort each column independently, then concatenate the results into a new matrix.

Sign in to comment.

Accepted Answer

Stephen23
Stephen23 on 31 Mar 2021
Where T is your table:
sortrows(T,[1,2,-3])

More Answers (1)

David Hill
David Hill on 31 Mar 2021
You can't have a matrix with characters and numbers. But if you convert the characters to double, then:
A=[sort(A(:,1)),sort(A(:,2)),sort(A(:,3),'descend')];
  1 Comment
Karol Buchajczuk
Karol Buchajczuk on 31 Mar 2021
I'm sorry, it is actually a table, not a matrix. I've corrected my question accordingly.

Sign in to comment.

Categories

Find more on Shifting and Sorting Matrices in Help Center and File Exchange

Products


Release

R2021a

Community Treasure Hunt

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

Start Hunting!