How can I write to a txt file dynamically?

Question

Ahmed Elkady 2012-8-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/45016-how-can-i-write-to-a-txt-file-dynamically

I want to save this form to a text file:

 Col1 Col2 Col3 ..... ColN       % Text File Heading
   4    45  345 .....   34
  34    88  455 .....   73

Note: The number of columns "N" is variable.

I need an expression that is a function in "N" inside a loop (1:N)

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nanren888 2012-8-1

Can you ask the question again in different words?

Ahmed Elkady 2012-8-1

To make it more easier. I need an expression where I specify a value "N" and then it automatically writes Col1 Col2 Col3 up to ColN in the text file as shown earlier.

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Answer 1

venkat vasu 2012-8-1

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https://ww2.mathworks.cn/matlabcentral/answers/45016-how-can-i-write-to-a-txt-file-dynamically#answer_55153

编辑：Walter Roberson 2012-8-1

在 MATLAB Online 中打开

A = round(rand(6,7)*9);  % Write this to file.
 fid = fopen('Mymatrix.csv','wt');
     c='col';
  for i = 1:size(A,2)
      fprintf(fid,'%s=%d\t',c,i);
  end
  fprintf(fid,'\n');
    for ii = 1:size(A,1)
      fprintf(fid,'%g\t',A(ii,:));
      fprintf(fid,'\n');
  end
  fclose(fid);

this may help you...

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Ahmed Elkady 2012-8-1

Thank you .. very helpful

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Answer 2

Oleg Komarov 2012-8-1

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/45016-how-can-i-write-to-a-txt-file-dynamically#answer_55176

编辑：Walter Roberson 2012-8-1

在 MATLAB Online 中打开

A = [ 4 45 345 34
     34 88 455 73];
% Number of columns
    N = 2;
% Create/open file discarding content
    fid = fopen('test.txt','w');
% Write header
    fmt = sprintf('Col%d\t',1:N);
    fprintf(fid,[fmt(1:end-1) '\r\n']);
% Write data
    fmt = repmat('%.f\t',1,N);
    fprintf(fid, [fmt(1:end-2) '\r\n'],A');
    fclose(fid);