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removing duplicates in an array

42 次查看（过去 30 天）
Esegboria Osarhemen
编辑： Brent F 2021-6-10
If i have the following array
a =[1,1,1,2,2,1,1,6,6,6,8,8,2,2,3,3,2,2]
When i do unique(a,'stable'), i get
[1,2,6,8,3]
I want the following result
[1,2,1,6,8,2,3,2]

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采纳的回答

Stephan
Stephan 2019-3-3
b = a(logical([1 (diff(a)~=0)]))
  2 个评论
Jan
Jan 2019-3-4
(diff(a)~=0) is a logical vector. Concatenating it with a double converts it to a double. Casting it by logical() converts it again. More efficient:
b = a([true, diff(a)~=0])
Now the values are not converted twice.

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更多回答（1 个）

Brent F
Brent F 2021-6-10
编辑：Brent F 2021-6-10
Using @Jan's idea, but:
  • Package as a function
  • Handle case where column-vector is given (return in same format as given)
function [uniqueSequence] = DedupSequence (seq)
% Eliminate sequentially repeated rows
% Create row vector for diff (must transpose if given a column vector)
if size(seq,1) > 1
seqCopy = seq(:,1)';
else
seqCopy = seq;
end
uniqueSequence = seq([true, diff(seqCopy)~=0]);
end

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