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Findgroups, order of unique values in an array

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ardeshir moinian
ardeshir moinian on 3 Feb 2021
Commented: Stephen on 4 Feb 2021
Hi,
I am trying to use "findgroups" in order to later split my data into different groups. But the order at which the groups are seperated is important for me. Using "findgroups" the order of groups is not "stable". How can I change that?
I did this:
[G ID]=findgroups(labels_all);
But
ID
doesn't come in that same order as
labels_all
I know that in unique, stable can fix this
q=unique((labels_all),'stable')
here q will be in order that unique values occur in labels_all.
Thank you!

Accepted Answer

Stephen
Stephen on 3 Feb 2021
[ID,~,G] = unique(labels_all,'stable')
  2 Comments
Stephen
Stephen on 4 Feb 2021
Lets try it:
G = [2,3,1,2,1,3];
D = [4,5,0,0,2,1];
splitapply(@mean,D,G)
ans = 1×3
1 2 3
Yes, splitapply returns its outputs in the order given by the values of G.

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