How do i solve this situation?

I have list of file like this.

trj.hst.00.+00

trj.hst.01.+00

trj.hst.02.+00

trj.hst.03.+00

...

So, I want to use while loop and The number of files is not fixed

I do not know whether to use some functions.

Are as follows: The code I wrote

 c=0;
while (?)
    file = sprintf('trj.hst.%02d.+00',c);

 fid = fopen(file);

 tline = fgetl(fid);

 while ischar(tline)

matches = strfind(tline, '#');

   num = length(matches);

   if num > 0

     tline = fgetl(fid);
   else
       B_temp = tline;
       B = fscanf(fid, '%g %g %g %g %g %g %g %g', [8 inf]);
       tline = fgetl(fid);
   end

 end

 fclose(fid);

 B2 = str2num(B_temp);
B = B';

 res = [B2; B];

 DATA(1,c).res = res;
% DATA.res_tline = B_temp;
c=c+1;
end

Thanks in advance.

Answer 1

[Carsci]

Use the output fid (fileID) from fopen for your while condition. When the while loop gets to the end of the list, if the file does not exist then fopen cannot open the file and fileID is -1.

Only use the functions when fopen successfully opens a file, i.e. when it returns a file identifier greater >= 3

fid=0; c=0;
  while fid ~= -1
      file = sprintf('trj.hst.%02d.+00',c);
      fid = fopen(file); 
      if fid < 3 continue; end 
          disp(['MIHYUN: Reading ' file])
          tline = fgetl(fid); 
          while ischar(tline)
              matches = strfind(tline, '#');
              num = length(matches);   
              if num > 0
                  tline = fgetl(fid);
              else
                  B_temp = tline;
                  B = fscanf(fid, '%g %g %g %g %g %g %g %g', [8 inf]);
                  tline = fgetl(fid);
              end
          end
          fclose(fid); 
          B2 = str2num(B_temp);
          B = B'; 
          res = [B2; B]; 
          DATA(1,c).res = res;
          DATA.res_tline = B_temp;
      c=c+1;
  end

[MIHYUN]

Thank you for your help!

Answer 2

[Jos (10584)]

This problem is composed of smaller problems that you may or may not have solved. You can at least tackle them one by one

Problem 1 - How to get the list of files

You can collect them all at once using dir

Myfiles = dir('tr.hst.*.+00') ;

Problem 2 - Load a single file

filename = ...
fid = fopen(filename)
% load the data
res = … % your code here
fclose(fid)

Problem 3 - Get the data of all the files

for k=1:numel(Myfiles)
   filename = MyFiles(k).name ;
   % code from problem 2 here
   DATA(k).res = res ;
end