Sort values in a cell array

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Sergio Rojas Blanco
Sergio Rojas Blanco on 21 Jul 2022
Edited: Bruno Luong on 21 Jul 2022
Hi guys, It's amazing how much some people know.
Well, this is my case:
I have a vector. Suppose this:
A=[90,45,38,51];
To this vector correspond another vector. Some values may be duplicates but it is not known how many.
B=[8,1,8,3]
So, I want to sort them and set the initial values in a cell array. The result would be this:
C={[45],[51],[90,38] }
I wish I didn't have to use loop.
Thank you all for your help, especially helping me with this :)

Accepted Answer

Stephen23
Stephen23 on 21 Jul 2022
Edited: Stephen23 on 21 Jul 2022
A = [90,45,38,51];
B = [8,1,8,3];
[~,~,X] = unique(B);
C = accumarray(X,A(:),[],@(v){v})
C = 3×1 cell array
{[ 45]} {[ 51]} {2×1 double}
Checking the content of C:
C{:}
ans = 45
ans = 51
ans = 2×1
90 38
  1 Comment
Sergio Rojas Blanco
Sergio Rojas Blanco on 21 Jul 2022
Stephen23, thank you very much. How fast!

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More Answers (1)

Bruno Luong
Bruno Luong on 21 Jul 2022
Edited: Bruno Luong on 21 Jul 2022
Another method
B=[8,1,8,3];
A=[90,45,38,51];
[Bs,i]=sort(B);
mat2cell(A(i),1,diff(find([true,diff(Bs)>0,true])))
ans = 1×3 cell array
{[45]} {[51]} {[90 38]}
% or more compact
mat2cell(A(i),1,diff(find([1,diff(Bs),1])))
ans = 1×3 cell array
{[45]} {[51]} {[90 38]}

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