Why won't \n give me a new line?

450 次查看（过去 30 天）
Katie
Katie 2013-8-7
评论： Walter Roberson 2022-8-23
I am trying to write my data to a text file but the usual \n is not giving me a new line!
fid1 = fopen(filedesignation,'w');
fprintf(fid1,'%s, ',title1);
fprintf(fid1,'%4.2f, %4.2f, %4.2f, %4.2f, %4.2f\n',DataMatrix);
fclose(fid1);
When I try printing this to the command window, the \n works, but not when I try and write to a file. Why?!
How can I get a line return in my text file if this doesn't work?
  6 个评论
显示 4更早的评论
Priya Mittal
Priya Mittal 2019-9-4
Change the 'w' parameter in fopen to 'wt'. Worked for me.
Jan
Jan 2019-9-4
Fortunately even NotePad shipped with modern Windows 10 is able to display \n correctly now.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Jan
Jan 2013-8-8
It works perfectly when you write it to a file also. But the Windows NotePad ("Editor" in German) fails to display the linebreaks correctly. But Matlab's editor, Word, NotePad++, WordPad, (X)Emacs (under Linux and Windows), Alpha (on MacOS-9 !), BBEdit, vi, etc. display the \n line break correctly even without the \r.
When you open the file in the 'wt' mode, \n is converted to \r\n automatically, but this can have certain unexpected side effects. E.g. the number of characters obtained by ftell can differ from the number of bytes the file has. Reading by fgets will be slower, because all control characters are considered on the fly, e.g. backspaces and ^Z as end-of-file. In addition the created results differ between Windows and Linux. So I'd prefer to retire NotePad, install NotePad++ or WordPad as standard viewer of txt files and prefer the \n linebreaks as Matlab's editor does for several years now.
  1 个评论
Evangelos Stefanidis
Evangelos Stefanidis 2019-5-6
Thank you Jan, I had totally forgot about Notepad++ ! Also Thank you Katie for asking this question, I had hard time for a while and I was only opening the .txt files with my results through matlab... lol.

请先登录，再进行评论。

更多回答（5 个）

Cedric
Cedric 2013-8-7
You will need \r\n for producing a carriage return and a new line. This is a well documented issue between UNIX-based and Windows operating systems.
  3 个评论
显示 1更早的评论
Keqin Xu
Keqin Xu 2019-1-11
Files created this way cannot be properly read using ...'deliminator','\n'...
An example is attached.
Walter Roberson
Walter Roberson 2019-1-11
the success is going to depend on which command you are passing that parameter to and potentially on how you open the file.
Generally telling a function that the delimiter is \n is an interface contract: you are making a promise about the file and the function is permitted to take you at your word.
My guess looking at that file is that you would use
parts = regexp( fileread('Run_01.txt'), '\r?\n', 'split');
if isempty(parts{end})
parts(end) = [];
end
that will work whether the file has cr lf or lf only. It will not work for cr only though. This code will not remove interior empty lines. The if at the bottom is to handle the fact that if the file ends in newline then the split process thinks that there is an empty line after it. Files are permitted to either just end without a newline or else to end in a newline (that is to say that there is no standard as to whether newline is a line separator or else a line terminator .)

请先登录，再进行评论。

Camilo Rocha
Camilo Rocha 2019-4-25
You just have to put 'wt' when you call fopen function
fid1 = fopen(filename,'wt')
Roxanne de la Garza
I put my \n at the beginning instead of the end and it worked for me. fprintf(fid1,'\n %4.2f, %4.2f, %4.2f, %4.2f, %4.2f',DataMatrix);
  2 个评论
Matthes Müller
Matthes Müller 2018-2-7
Worked for me also, thank you so much!
ustin yanu
ustin yanu 2020-4-6
编辑：ustin yanu 2020-4-6
worked for me too, thx, wonder why?
i have this
elseif x<1300
a=x-1200;
b = [ fix(a/1e+2)-1E+2*fix(a/1e+4) rem(a, 1e+2)];
fprintf('\nYou entered %d:%d%d',b)
fprintf('\nThe equivalent time based on a 12-hour clock is %d:%d%d',b)
disp('PM')

请先登录，再进行评论。

Aasim
Aasim 2013-11-13
Works well.. Thanks!
Milad Hasani
Milad Hasani 2022-8-22
As a suggestion, you can use:
\newline
  1 个评论
Walter Roberson
Walter Roberson 2022-8-23
Ran in:
\newline is for Latex, and will not work for fprintf() or sprintf()
fprintf('abc\newlinedef')
abc ewlinedef

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Environment and Settings 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by