MATLAB: How to delete duplicate values in a cell array of characters

charactersdeleteduplicate

hi! I have this cell array of charachter:

a={'1';'1';'1';'1';'1';'3';'3';'3';'3';'3';'3';'4';'4';'4';'4'};

and I want to trasform it in this:

a={'1';'';'';'';'';'3';'';'';'';'';'';'4';'';'';''};

can you help me? thanks

Best Answer

a={'1';'1';'1';'1';'1';'3';'3';'3';'3';'3';'3';'4';'4';'4';'4'};
[~,c,~]=unique(a);
tmp=true(size(a));
tmp(c)=false;
[a{tmp}] = deal('')

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MATLAB: Trasform to cell of strings

I already answered this in your earlier question. Your claimed that "I have tried your code but it continues to give me an error", but it turns out you did not even try it.

Your cell array contains multiple empty cells, and also cells that contain cells with non-scalar strings. In the general case it is not possible to convert a cell array with non-scalar string into a character array of the same size as the cell array. The only case where this conversion is guaranteed is if every string is scalar, which is not the case for your cell array.

>> postfix(cellfun(@isempty,postfix)) = {''};
>> out = reshape([postfix{:}],size(postfix));
>> size(out)
ans =
   137    25  
>> iscellstr(out)
ans =  1

Consider the example from my original answer: if you converted Y (a cell-array of strings) to a character array, what size would you expect it to be? Your requirement is that it should be the same size as X, but this is not possible:

 >> X = {{'A'},{'bb'};{'CCC'},{'d'}}
  X = 
      {1x1 cell}    {1x1 cell}
      {1x1 cell}    {1x1 cell}
  >> Y = reshape([X{:}],size(X))
  Y = 
      'A'      'bb'
      'CCC'    'd'
  >> char(Y)
  ans =
  A
  CCC
  bb
  d

Best Answer

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