After creating a folder structure and .m file, I want to write to the file, but the fid keeps coming back as -1. What should i be doing that I'm not?

25 次查看（过去 30 天）
Aaron
Aaron 2025-12-9，17:44
评论： dpb 2025-12-9，21:24
% Here are the variable name string values:
% outputFileName = "Aaron.m"
% outputFilePath = "./folder/yayy/"
% currentSection is a string with a bunch of data
% ===================================
file = fullfile(outputFilePath, outputFileName);
mkdir(file);
[fid, msg] = fopen(file, 'w');
if fid == -1
error('Could not open file "%s" for writing.', file, msg);
end
% Write the content of the current section to the new .m file
fprintf(fid, '%s\n', currentSection);
% Close the file
fclose(fid);
  1 个评论
Stephen23
Stephen23 2025-12-9，17:59
编辑：Stephen23 2025-12-9，17:59
"What should i be doing that I'm not?"
It is the other way around, you are doing something that you shouldn't: you create a folder with the value of file... which you then try to FOPEN. It is not possible to FOPEN a folder.

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采纳的回答

dpb
dpb about 5 hours 前
编辑：dpb 2025-12-9，19:05
file = fullfile(outputFilePath, outputFileName);
mkdir(file);
You created the directory with the fully qualified file name, not the folder...
% Here are the variable name string values:
% outputFileName = "Aaron.m"
% outputFilePath = "./folder/yayy/"
% currentSection is a string with a bunch of data
% ===================================
file = fullfile(outputFilePath, outputFileName);
if exist(outputFilePath)~=7 % see if already exists, if not create it but not multiple times
mkdir(outputFilePath);
end
[fid, msg] = fopen(file, 'w');
if fid == -1
error('Could not open file "%s" for writing.', file, msg);
end
% Write the content of the current section to the new .m file
fprintf(fid, '%s\n', currentSection);
% Close the file
fclose(fid);

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