How to find first non repeated (unique) character in a string?

Question

Sam Accura 2019-2-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/444950-how-to-find-first-non-repeated-unique-character-in-a-string

评论： Sam Accura 2019-2-14

I have already tried to find a Matlab function for this but doesnt seem to be one apart from 'unique' which only eliminates duplicates. Any ideas for code on how to do this?

For example, an input of 'hello' would return h or an input of 'radar' would return d.

The unique characters in 'hello' are h,e and o with h being the first in line

The unique character in 'radar' is only d and so this would also be the first

Any help would be appreciated

2 个评论
显示无隐藏无

madhan ravi 2019-2-14

please illustrate with an example

Sam Accura 2019-2-14

Example added to question - thank you

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

madhan ravi 2019-2-14

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/444950-how-to-find-first-non-repeated-unique-character-in-a-string#answer_361012

在 MATLAB Online 中打开

u=unique(s,'stable'); % where s is your input
Z=arrayfun(@(x)nnz(s==u(x)),1:numel(u));
Result=u(find(Z==1,1,'first'))

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Sam Accura 2019-2-14

Thank you very much - very helpful.

请先登录，再进行评论。

Answer 2

Andrei Bobrov 2019-2-14

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/444950-how-to-find-first-non-repeated-unique-character-in-a-string#answer_361013

z = 'hello';
[a,~,c] = unique(z,'stable');
out = a(find(accumarray(c,1) == 1,1));

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。