unique function in matlab

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zhang
zhang 2012년 7월 31일
댓글: Walter Roberson 2017년 1월 21일
Hi guys
In the version of R2012a, the unique function has a 'stable' property. Please see the link:
A = [9 2 9 5]; [C, ia, ic] = unique(A,'stable')
C =
9 2 5
ia =
1
2
4
ic =
1
2
1
3
But my matlab version is R2010a, it seems that the unique function in R2010a does not support 'stable'. How can I get the stable result?
Thanks,
  댓글 수: 4
Walter Roberson
Walter Roberson 2017년 1월 21일
Paul Cisek: how would you envision that working? You seem to be implying that Mathworks should only make bug fixes and performance improvements that do not change the output at all (even at the round-off level.) Does that sound like a route to financial viability?

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답변(2개)

Albert Yam
Albert Yam 2012년 7월 31일
I needed this as well, for R2007a
[uA a b] = unique(A,'first');
C = A(sort(a));
  댓글 수: 1
Sean de Wolski
Sean de Wolski 2012년 7월 31일
I like this better than mine.

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Sean de Wolski
Sean de Wolski 2012년 7월 31일
The 'stable' option was introduced in R2012a.
One way to achieve something similar with an older release is to first sort the vector, then unique it and then index back into the original.
A = [9 2 9 5 5 4 4 1 1 1];
[As,idx] = sort(A);
[U,ij] = unique(As,'first');
A(sort(idx(ij)))

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