append data...it doesnt change line
6 次查看(过去 30 天)
显示 更早的评论
i want to open the 33.txt go to the end of the file add the number 4 ,change line and etc etc...
clc
for k=1:1:5;
fid=fopen('C:\Users\Mr Andrew\Desktop\33.txt','a');
fprintf(fid,'4 \n')
end
what is my error ? my code doesnt change line... thank you
0 个评论
采纳的回答
Tom
2013-6-26
try adding a carriage return as well:
fprintf(fid,'4 \r\n')
I'd also recommend using fclose(fid) each time you've finished with the file
3 个评论
Tom
2013-6-27
for what it's worth, Jan is correct about this being a Notepad issue - if you just use '\n' and open it within MATLAB, it appears on a new line.
更多回答(2 个)
Image Analyst
2013-6-26
Why is fopen inside the loop? You aren't showing all your real code but chances are that you want it before the loop, not inside it. Also, add an fclose after the loop.
Jan
2013-6-26
The data is written, when the file is closed:
fid = fopen('C:\Users\Mr Andrew\Desktop\33.txt', 'a');
for k = 1:5
fprintf(fid,'4 \n')
end
fclose(fid); % close the file!
2 个评论
Jan
2013-6-27
编辑:Jan
2013-6-27
The text file created by my program is correct and understood by almost all editors. Only Notepad fails, but this is a problem of Notepad, not of the file.
Bit inserting the \r explicitly causes traoubles under e.g. older versions of XEmacs, the TeX interpreter, Matlab until version 6.5 under Linux, etc. Therefore the most efficient solution is relying on '\n' and omitting the usage of the dull Notepad (Notepad++ from the net is much smarter!).
Another method to create the old DOS linebreaks under Windows: Open the file in text-mode:
fopen(FileName, 'at')
Then fprintf(fid, '\n') writes \r\n autoamtically. But this can have strange side effects, like using the End-Of-File character accidently and the number of characters will differ from the number of bytes.
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Low-Level File I/O 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!