Sort a table with different orders for different columns

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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 Kommentare
Karol Buchajczuk
Karol Buchajczuk am 31 Mär. 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 am 31 Mär. 2021
It would likely be necessary to sort each column independently, then concatenate the results into a new matrix.

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Akzeptierte Antwort

Stephen23
Stephen23 am 31 Mär. 2021
Where T is your table:
sortrows(T,[1,2,-3])

Weitere Antworten (1)

David Hill
David Hill am 31 Mär. 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 Kommentar
Karol Buchajczuk
Karol Buchajczuk am 31 Mär. 2021
I'm sorry, it is actually a table, not a matrix. I've corrected my question accordingly.

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