To remove the repeated number

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sudha rani
sudha rani 2013-2-7
i have a matrix [1 2 2 2 3 4 5] and i want to get the result has [1 2 3 4] by replacing the repeated 2 by the single number.

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回答（3 个）

Brian B
Brian B 2013-2-7
Use
unique([1 2 2 2 3 4 5])
Note that this will also sort the elements.
-B
Andrei Bobrov
Andrei Bobrov 2013-2-7
% without sorting array
m = randi(5,1,10);
[~,ii] = sort(m); % for Jan's solution
jj = [true,diff(m(ii))~=0];
out1 = m(sort(ii(jj)));
out2 = unique(m,'stable'); % in R2012a and later
[u,b] = unique(m,'first'); % old releases
[~,ii] = sort(b);
out3 = u(ii);
  1 个评论
Jan
Jan 2013-2-7
Very old releases do not know the 'first' flag in the unique() command.

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Jan
Jan 2013-2-7
No sorting, considering only neighboring elements such that e.g. [1,2,1] is not altered:
m = [1 2 2 2 3 4 5];
u = m([true, diff(m) ~= 0]);
You see, there are many different solutions, because your problem is not defined exactly: Sorting, not neighboring repetitions, ...

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