Reading and Replace lines in input data for many lines

Hello,

I have a problem with a code.

Imagine that I have File3.txt, File2.txt and one .exe file (lets call it my.exe). File3.txt has my data, File2.txt is the input of my.exe(input that is needed in order to execute my.exe).

I would like from file3 to take only one line and put in a specific line of the file2(input). After putting this line in file2 I can run my exe file. The problem is that File 3 obtain many lines. I want to use o for loop in order to run my .exe file for all the lines separately of file3 (I mean I would like to take the first line of 2nd and 3rd column from file 3, put this line to file2, run my.exe file and take my results. After that I would like to take the second line of 2nd and 3rd column from file 3, put this line to file2, run my.exe file and take my results. After all this repeatability I would like to the last line of 2nd and 3rd column of file 3 put this line to file2, run my.exe file and take my results.)

I have to mention that I want after each repeatability the name of input file (File2.txt) does not change, inspite of the different content.

%for 
% for j= 1: size{lines_to_replace_with,1}
% 
% line_to_replace_withnew = sprintf('%g\t%g',lines_to_replace_with(j));
% end 
t3 = readtable('Files3.txt', 'readvariablenames', true);
nrow = size(t3,1);
lines2 = regexp(fileread('File2.txt'), '\r?\n', 'split') .';
for K = 1 : nrow
   line_to_replace_with = sprintf('%g\t%g',t3{K,2:3});
   replaced_lines = [lines2(1:2); line_to_replace_with; lines2(4:end)];
   newfilename = sprintf('newfile%d.txt', K);
   fid = fopen(newfilename, 'wt');
   fprintf(fid, '%s\n', replaced_lines{:});
   fclose(fid);
end
system('my.exe <File2.txt')

Could you please help me?

[Rik]

How would you write this code to insert 1 line from files3 and run your program (and how can you retrieve the results so they don't get overwritten)? Then we can more easily help you to write the complete loop.

[Ivan Mich]

I have a subroutine that making the calculations I want. I don;t know if I could do this by not overwritte every results by each line.

[Rik]

What code would you write for one line from files3? Then it should be relatively easy to extend it.

t3=function_to_read_to_cell;
data=cell(size(t3))
for n=1:numel(t3)
    function_to_write_file2(t3{n});
    system('my.exe <File2.txt')
    data(n)=function_to_read_back_results;
end

Answer 1

[Stijn Haenen]

What about creating a new txt file in every loop and overwriting the existing file2.txt instead of replacing lines?

[Ivan Mich]

How I could do this? Could you explain me please?

[Stijn Haenen]

Here is an example:

text_example='test';
number_example=10;
txt_file=fopen(sprintf('File2.txt'),'wt');

fprintf(txt_file,'%s\n','test0');  %writing text, \n means new rule
fprintf(txt_file,'%s\n',text_example);
fprintf(txt_file,'%g\n',3);         %writing number
fprintf(txt_file,'%g\n',number_example);        


fclose(txt_file);