Loading many .txt files by title in matlab

Hi, I need advice. In the following script, I for successive cycles for retrieving files by name. Each file is a series of numbers many that need to be loaded into the output matrix. I need to modify the code, I did not have eval in each line to manually enter the path to the file, but to create another transformation, where you enter the path to the appropriate folder for example. file = 'D: \ Matrix \ tomas-544-1a.avi_d' and for the rest of the cycle has been loaded. File entries are always the same names (matice_000 to matice_144) I just need to change the default folder, You do not know how to edit syntax ???

if true
  for i=0:144
  if i<10
      eval(strcat('fileID = fopen(''D:\Matice\tomas-544-1a.avi_d\matice_00',num2str(i),'.txt'',''r'');'));
      C = textscan(fileID,'%c');
      textaky(:,i+1)=str2num(C{1});
  elseif i<100
      eval(strcat('fileID = fopen(''D:\Matice\tomas-544-1a.avi_d\matice_0',num2str(i),'.txt'',''r'');'));
      C = textscan(fileID,'%c');
      textaky(:,i+1)=str2num(C{1});
  else
      eval(strcat('fileID = fopen(''D:\Matice\tomas-544-1a.avi_d\matice_',num2str(i),'.txt'',''r'');'));
      C = textscan(fileID,'%c');
      textaky(:,i+1)=str2num(C{1});
  end       
end
end

Answer 1

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

Answer 2

[Stephen23]

https://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

[Marek Rousek]

ok, thanks for the advice, I am really a beginner, but at the moment I have no other options of getting willed data from .txt. Therefore, I need advice, I can make a GUI where a person enters the path to the folder and the program no longer reads the data.

I think it is only a simple change to the program, but not to lose it ...