fprintf output line break

Hi all,

I am writing a code where under a string is generated and stored in an array.

After the array is stored, I use fprintf to write the array into an data file, and then later on the string within the array is replaced within a new string and the cycle repeats.

The problem I am having is that I have been unable to make each fprintf cmd to print in a new line in the output file so I get something looking like this:

 dataline dataline dataline dataline dataline dataline dataline

...instead of this:

dataline 

dataline 

dataline 

dataline 

dataline

I've been tinkering with formatting but I still can't get it right. Can any one help me?

Thanks!!!

[Joao Linhares]

On my side it worked by:

fprintf(fid, '%s', thestring);

fprintf(fid,'\n');

So basically if you split the code it works better.

Cheers

Answer 1

[Walter Roberson]

fprintf(fid, '%s\n', TheString);

[Nikolay Rodionov]

I tried this already and it did not work for some reason. Can you think of another way?

[Midhulesh Vellanki]

This works, but open your file in Notepad++ or other application, default windows application does not represent the correct format, sometime shows new line as a space.

[Walter Roberson]

On Windows, when you fopen() your file then use 'wt' instead of just 'w' to force CR+NL to be output instead of just NL

Answer 2

[Image Analyst]

Try

fprintf(fid, '%s\n\r', TheString);

If that doesn't work try it with the n and r reversed.

fprintf(fid, '%s\r\n', TheString);

One of them should work.

[LeChat]

Thank you!

fprintf(fid, '%s\r\n', TheString);

worked for me (Matlab 2021a on Windows).

Answer 3

[Matthew Cooper]

If you are writing to a file recursively, you may need to substitute 'a' for 'w' on fopen:

fopen(fid,'foo.txt','w');
fprintf(fid,formatspec,text);
fclose(fid);
fopen(fid,'foo.txt','a');
fprintf(fid,formatspec,newtext);

[Walter Roberson]

That would not affect the user's situation. This was a newline vs carriage-return+newline matter.

[Matthew Cooper]

Can you suggest a better thread for my contribution? When you invert my answer for a question and ask it, you arrive here. It would have helped me, I am sure it will help someone else. Your clarification is also helpful. Cheers.

Answer 4

[Samu TanakaBlitch]

I was having the same issue earlier today when i was writing the code and other solutions i found on the internet was not working so i just inserted a disp('"space"') to make it push to the next line.

(earlier it was like this)

(afterwards)

(example of working one)

fprintf( 'The peak resultant head acceleration experienced in the TC-14 crash test is %4.2f g.',peak)

disp(' ')

fprintf('The peak resultant head acceleration experienced in the HCR-16 crash test is %4.2f g.',peakhcr)

disp(' ')

fprintf('The peak resultant head acceleration experienced in the FF-15 crash test is %4.2f g.',peakff)

[Walter Roberson]

You should have just put in \n

fprintf( 'The peak resultant head acceleration experienced in the TC-14 crash test is %4.2f g.\n',peak)

Answer 5

[Christine Itchon]

What do you think would happen if the newline character were omitted from the fprintf statement below?

>> fprintf(‘The value is %d, for sure!\n’,4^3)

[Image Analyst]

Go ahead and try it.

>> fprintf('The value is %d, for sure!\n',4^3)

The value is 64, for sure!

>> fprintf('The value is %d, for sure!',4^3)

The value is 64, for sure!>>

As you can see if the final newline is omitted, the >> prompt does not happen on the next line. It happens on the same line.