How to group string datasets?

Question

Matthew 2014-4-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/126095-how-to-group-string-datasets

评论： Matthew 2014-4-22

I have the following dataset:

ID_Ref      SP    MD    FI
123456      []    []    'A+'
234567      []    []    'A'
234567      []    []    'A'
345678      []    []    'A+'
345678      []    'Aa2'    []
456789      []    []    'A+'
456789      []    'Aa2'    []
456789      ‘AA+’    'Aa2'    []

All the column arrays are string.

How do I group the above dataset by unique ID_Ref to read:

ID_Ref      SP    MD    FI
123456      []    []    'A+'
234567      []    []    'A'
345678      []    'Aa2'    'A+'
456789      ‘AA+’    'Aa2'    'A+'

Apologies if you are unable to read this table in this message box.

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Answer 1

Azzi Abdelmalek 2014-4-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/126095-how-to-group-string-datasets#answer_133638

编辑：Azzi Abdelmalek 2014-4-17

在 MATLAB Online 中打开

Edit

ratings={123456  []     []  'A+'
      234567  []     []  'A'
       234567  []     []  'A'
      345678  []    'Aa2'  'A+'
      456789  'AA+' 'Aa2'  'A+'
      345678  []    'Aa2'  []
      456789  []     []   'A+'
      456789  []    'Aa2'   []
      456789  'AA+' 'Aa2'   []}
A=cellfun(@num2str,ratings,'un',0);
c1=cell2mat(ratings(:,1));
[ii,jj,kk]=unique(c1,'stable');
cc=size(A,2);
out=cell(numel(ii),cc);
for k=1:numel(ii)
  idx=find(kk==k);
  out{k,1}=ii(k,1);
  for mm=2:cc
      a=A(idx,mm);
      b=unique(a);
      out{k,mm}=b{end};
  end
end
out(cellfun(@isempty ,out))={[]}

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Matthew 2014-4-22

在 MATLAB Online 中打开

Hi Azzi,

I have used your code above again and it works to a certain extent:

Here is the code I have used but I am getting the following error now:

"Index exceeds matrix dimensions."

This error is occurring from the for line stage.

Here is the code I have used:

Ratings = dataset2cell(Ratings);
Ratings = cellfun(@num2str,Ratings,'un',0);
[ii,jj,kk] = unique(Ratings,'stable');
cc = size(Ratings,2);
Ratings1 = cell(numel(ii),cc);
for k=1:numel(ii)
  idx=find(kk==k);
  Ratings1{k,1}=ii(k,1);
  for mm=2:cc
      a=Ratings(idx,mm);
      b=unique(a);
      Ratings1{k,mm}=b{end};
  end
end
Ratings1(cellfun(@isempty ,out)) = {[]};

Can you help me from the for line stage please as it still producing the final unique table with merged rating and how I bypass/ correct so this error message does not appear?

Thanks

Matthew 2014-4-22

Okay I have done a bit more digging and it is to with the following function:

[ii,jj,kk] = unique(Ratings,'stable');

It is taking into account the Rating column headers i.e. SP, MD and FI and the values these columns can take and then putting that in the ii table at the bottom.

Any suggestions how to make the function work properly?

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