logical operation with categorical data

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Doron Joffe 2021-12-1

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编辑： Stephen23 2021-12-1

I have 6 csv files with one of the variables in the csv file containing names of players. I want to perform operations only if the name in the particular file is the name of a certain player. When I perform the logical operation in the 'if' line, I get an error. Am I performing the logical operation incorrectly? Is there a different way to do logical operations with categorical data?

for i = 1:6  
   csv = readtable(file(i).name);
   K=categorical(csv.Var2(2)); %% reads the player name as categorical data. 
   if K=='Ronaldo'||'Messi'||'Neymar'  % Only enter the loop if K is one of these players names
   m=0;
   m=m+1;
   end
end

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Stephen23 2021-12-1

编辑：Stephen23 2021-12-1

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This will not work because you are attempting logical operations on character arrays of different sizes:

'Ronaldo'||'Messi'||'Neymar'

Use ISMEMBER or CONTAINS instead.

Doron Joffe 2021-12-1

Thank you very much for all the help.

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Answer 1

Rik 2021-12-1

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This depends a bit on your source data, but you should look at the ismember function. Especially when combined with any, it really helps in these situations. Alternatively you could look at switch, which also allows multiple case definitions.