Why won't \n give me a new line?
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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 commentaires
Jan
le 4 Sep 2019
Fortunately even NotePad shipped with modern Windows 10 is able to display \n correctly now.
Réponse acceptée
Jan
le 8 Août 2013
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 commentaire
Evangelos Stefanidis
le 6 Mai 2019
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.
Plus de réponses (5)
Cedric
le 7 Août 2013
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 commentaires
Keqin Xu
le 11 Jan 2019
Files created this way cannot be properly read using ...'deliminator','\n'...
An example is attached.
Walter Roberson
le 11 Jan 2019
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 .)
Camilo Rocha
le 25 Avr 2019
You just have to put 'wt' when you call fopen function
fid1 = fopen(filename,'wt')
0 commentaires
Roxanne de la Garza
le 3 Fév 2018
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 commentaires
ustin yanu
le 6 Avr 2020
Modifié(e) : ustin yanu
le 6 Avr 2020
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')
Milad Hasani
le 22 Août 2022
As a suggestion, you can use:
\newline
1 commentaire
Walter Roberson
le 23 Août 2022
\newline is for Latex, and will not work for fprintf() or sprintf()
fprintf('abc\newlinedef')
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