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How to change duplicate values, so that every value is unique

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Richard Wolvers
Richard Wolvers 2017-6-13
评论： Richard Wolvers 2017-6-13
Hello everyone,
At this moment i am stuck with the following problem. I want to change the values of duplicate values, so every value is unique. While it is not allowed to change the position of these numbers in the matrix. Below is the starting matrix.
a = [10 20 20 30 20 30 40]';
And the desired output would be this:
b = [10 20 20.01 30 20.02 30.01 40]';
Thanks in advance!
  1 个评论
David Goodmanson
David Goodmanson 2017-6-13
Hi Richard, Take a look at the 'unique' function. After you have the unique values you can see how many times each one occurs and change the extra ones.

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采纳的回答

Walter Roberson
Walter Roberson 2017-6-13
[uvals, ~, uidx] = unique(a, 'stable');
b = a; %mostly to copy the class and size
for K = 1 : length(uvals)
mask = uidx == K;
b(mask) = uvals(K) + (0 : nnz(mask) - 1) * 0.01;
end

更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2017-6-13
编辑：Andrei Bobrov 2017-6-13
a = [10 20 20 30 20 30 40]';
[~,ii] = sort(a);
[~,~,c] = unique(a);
jj = cell2mat(accumarray(c,.1*ones(numel(a),1),[],@(x){cumsum(x)}));
out = jj(ii)-.1 + a;
or
a = [10 20 20 30 20 30 40]';
t = a == unique(a)'; % for MATLAB <= R2016a: t = bsxfun(@eq,a(:),unique(a)');
out = sum(cumsum(.1*t).*t,2)-.1 + a;

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