MATLAB: How to transfer a cell array content into ordinal values

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.

Best Answer

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
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