help with concatenation / eval

Hello...

I need to load several files with specific initials and numbers (ex: luc_1.txt to luc_10.txt) to further create variables from each column of those files

Im thinking of using "eval" to create variables, but i dont know how can i get the name of those variables that i've created

im thinking about something like this:

   num_part = input ('how many participants do u want to load? ');
  num = input ('type the number of trials: '); 
   np = 1; 
        for part = np : num_part

          np = np+1;
          initials = input ('type the initials of the participant: ', 's');
            weigth = input ('type the weigth of the participant: ', 's'); 

           n = 1; 
              for tentativ = n : num
                   name = [initials,'_',num2str(n)] ;
                  name_file = [name,'.txt'] ;
                  load (name_file) ;
                  n = n+1;

          eval([name,'fA = ' name ' (:,1:2) ;'])   
                eval([name,'fM = ' name ' (:,3:4) ;'])   
                eval([name,'fV = ' name ' (:,5:8) ;'])
               eval([name,'cX = ' name ' (:,9) ;'])
              eval([name,'cY = ' name ' (:,10) ;'])
             eval([initials,'weigth = ' weigth ' ;'])

              end
     end

how do i get the name of those variables tht i' created w/ eval? any suggestions?

thx :)

Answer 1

[Jos (10584)]

Avoid eval!

You want to use cell or structs. For example:

initials = 'AB'
weight = '171 lb'
for n = 1:3
  name_file = [initials '_' num2str(n) '.txt'] ;
  RAWDATA = load(name_file) ;
  data.(initials).values(n).fA = RAWDATA(:,1:2) ;
  data.(initials).values(n).fM = RAWDATA(:,3:4) ;
end 
data.(initials).weight = weight ;

[lucas]

hey Jos! thx for the help! But i never studied those structs stuff before!

I need to create a .txt with some calculations w/ those columns of each file

can i create a single .txt for all the participants, like:

fA.txt:

    luc_1.txt luc_2.txt joe_5.txt bob_3.txt
    data      data      data      data

or something like this

     luc_1_fA.txt, luc_2_fA.txt, joe_5_fM.txt.....

?

thanks :)