How to create multiple text files in a for loop?

Question

Yildirim Kocoglu 2017-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/372479-how-to-create-multiple-text-files-in-a-for-loop

回答： Naresh Pati 2020-2-8

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So here is a little code that I have written to create multiple text files in a for loop.

I need to store each complete calculation done in for loop into separate text files.

It creates the text files but, there is something wrong in my code.

I am sure I am getting close to achieving what I want to do but...

Basically, I am trying to write [1,2] & [4,5] into 2 different text files or store all the calculations into separate text files but, I get [4,5] instead on both text files.

This is not the actual project that I am working but, it's similar & I figured I should start with something simple & use that to the more complex problem otherwise, it might take me longer.

Thanks in advance. Any help is appreciated.

clear;
clc;
A=[1,2,3];
B=[4,5,6];
C={A,B};
F(1,2)=zeros();
for ii=1:2
  for i=1:length(C)
     for j=1:2
     D=C(i);
     E=D{1,1};
     F(1,j)=E(1,j);
     file_name=['file' sprintf('%d',ii) '.txt'];
     fileID=fopen(file_name, 'w+');
     fprintf(fileID,'%2.0f',F);
     fclose(fileID);
     end
    end
  end

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Stephen23 2017-12-12

编辑：Stephen23 2017-12-12

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It would be much simpler to make sprint define the complete name, rather than awkwardly concatenate its output as you do now:

file_name = sprintf('file%d.txt',ii);

But the main question is: why do you need so many loops? The cell array C contains two array, which can be iterated over using just one loop. What possible purpose do all of you other loops serve?

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Answer 1

Stephen23 2017-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/372479-how-to-create-multiple-text-files-in-a-for-loop#answer_295863

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You have too many loops. Try this:

A = [1,2,3];
B = [4,5,6];
C = {A,B};
for k = 1:numel(C)
  [fid,msg] = fopen(sprintf('file%d.txt',k),'wt');
  assert(fid>=3,msg)
  fprintf(fid,'%2.0f %2.0f',C{k}(1:2));
  fclose(fid);
end