how to transfer a cell array content into ordinal values?

i have a cell array of string content and i want to turn the contents of cell 2 into ordinal values according to the list shown below in 'clinicalVAL.png'

catnames = { 'stage i';  'stage ia'; 'stage ii'; 'stage iia'; 'stage iib'; 'stage iic'; 'stage iii'; 'stage iiia';'stage iiib'; 'stage iiic'; 'stage iv'; 'stage iva'; 'stage ivb'};
  valueset={1;2;3;4};
  for i=1:217
      B = categorical(Ystg{i}(2),catnames,valueset,'Ordinal',true);
  end

I have tried this code but doesn't work and i want to do it programmatically and not manually; is it possible in MATLAB?

ERROR: Error using categorical

Creating an instance of the Abstract class 'categorical' is not allowed.

Answer 1

[chocho]

Hi Friends, I created this code and run it and is worked well, but i wonder if there is another more fast code that can do this job????

 for i=1:217
      if strcmpi(Ystg{i}(2),'stage i') || strcmpi(Ystg{i}(2),'stage ia')
          Stage(i,1)  = 1;
      else if strcmpi(Ystg{i}(2),'stage ii') || strcmpi(Ystg{i}(2),'stage iia')|| strcmpi(Ystg{i}(2),'stage iib')|| strcmpi(Ystg{i}(2),'stage iic')
              Stage(i,1) = 2;
          else if strcmpi(Ystg{i}(2),'stage iii') || strcmpi(Ystg{i}(2),'stage iiia')|| strcmpi(Ystg{i}(2),'stage iiib')|| strcmpi(Ystg{i}(2),'stage iiic')
                  Stage(i,1)  = 3;
              else if strcmpi(Ystg{i}(2),'stage iv') || strcmpi(Ystg{i}(2),'stage iva')|| strcmpi(Ystg{i}(2),'stage ivb')
                      Stage(i,1) = 4;
                  end
              end
          end
      end
  end

[Stephen23]

@chocho: you accepted your own answer... even though you ask " i wonder if there is another more fast code that can do this job????"

You know that accepting your own answer discourages other people from helping you, because it tells everyone that this problem has been solved. It also prevents other people from gaining reputation points, when their answer is accepted.

Answer 2

[Jan]

Or simpler:

for i=1:217
  switch Ystg{i}(2)
  case {'stage i', 'stage ia'}
     Stage(i,1) = 1;
  case {'stage ii', 'stage iia', 'stage iib', 'stage iic'}
     Stage(i,1) = 2;
  case {'stage iii', 'stage iiia', 'stage iiib', 'stage iiic'}
      Stage(i,1) = 3;
  case {'stage iv', 'stage iva', 'stage ivb'}
      Stage(i,1) = 4;
  otehrwise  % No switch without otherwise!
      error('Unexpected value!');
end

[chocho]

@Jan Simon Thanks a lot

Answer 3

[Stephen23]

This is easy with regexp in just four lines, no loops or ifs or switches are required:

>> C = vertcat(Ystg{:});
>> D = strcat('\s(',{'i','ii','iii','iv'},')[a-d]?$');
>> E = cellfun(@(s)regexp(C(:,2),s,'once'),D,'Uni',0);
>> [F,~] = find(~cellfun('isempty',horzcat(E{:})).')
F =
   3
   3
   2
   2
   2
   2
   3
   2
   1
   2
   1
   3
   2
   1
   3
   3
   3
   4
   4
   2
   2
   3
   3
...etc

[chocho]

@Stephen Cobeldick thank you too much