Finding unique set from large dataset

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Hello!
How would one go about to find a unique set of variables that can depict shortly which variables are used in a large dataset using a matlab code?
For example if the english dictionary is my large dataset, I want the output to be the 26 alphabets-saying these are the unique variables used in your large dataset.
Another example
If x = {"abc", "bcd", "ded"}
I want the output as {"a","b","c","d","e"}
Thanks in advance!

Accepted Answer

madhan ravi
madhan ravi on 18 Jul 2019
a = cellfun(@(z)regexp(z,'.','match'),x,'un',0);
Output = num2cell(unique([a{:}]))
  5 Comments
Sanjana Sankar
Sanjana Sankar on 19 Jul 2019
Thank you all. I was looking for the output from Guillaume's method. Thanks a lot!!

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More Answers (2)

Waqar Ali Memon
Waqar Ali Memon on 18 Jul 2019

Bruno Luong
Bruno Luong on 18 Jul 2019
Edited: Bruno Luong on 18 Jul 2019
x = ["abc", "bcd", "ded"] % no need using curly bracket for strings
string(unique(cat(2,x{:}))')'

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