How to solve override writing file problem?

Question

Jason 2016-3-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/275101-how-to-solve-override-writing-file-problem

评论： Star Strider 2016-3-23

I have try-catch in my code, when I catch the error, I write the error information to a file, but it always override the previous error information, how to do to avoid this problem? I want to append the next error information to the previous error information.

for p=3:10
    ...
    Day = fdname(p).name;
    try
    ...
    catch
      fid = fopen('output-2016.err', 'wt');
      fprintf(fid, 'Inconsistent data in %s, skipped.\n', p);
      fprintf(fid, 'Inconsistent data in %s, skipped.\n', Day);
      fclose(fid);
    end

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Answer 1

Star Strider 2016-3-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/275101-how-to-solve-override-writing-file-problem#answer_214736

编辑：Star Strider 2016-3-23

在 MATLAB Online 中打开

I would put the fopen and fclose calls outside the loop:

fid = fopen('output-2016.err', 'wt');
for p=3:10
    ...
    Day = fdname(p).name;
    try
    ...
    catch
      fprintf(fid, 'Inconsistent data in %s, skipped.\n', p);
      fprintf(fid, 'Inconsistent data in %s, skipped.\n', Day);
    end
. . . CODE . . .
end
fclose(fid);