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saving data to the file

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Artur Lipnicki
Artur Lipnicki on 10 Oct 2016
Closed: MATLAB Answer Bot on 20 Aug 2021
How to use function fprintf in Matlab2016b? Why thoe following comands are uncorrect?
fid = fopen('file.txt','a');
fprintf(fid,'%.6f %.6f %.6f\n',xw,yw,rw);
fclose(fid);
  4 Comments
José-Luis
José-Luis on 10 Oct 2016
What's the value of fid?
Do you have write access to the current folder?

Answers (2)

Pritesh Shah
Pritesh Shah on 10 Oct 2016
Did you defined the variable xw,yw,rw?

Guillaume
Guillaume on 10 Oct 2016
Matlab failed to open the file. There may be many reasons for this, the file does not exist / the file is not is in the current directory (since you didn't specify a path) / you don't have read access to the file / something else.
Open the file with
[fid, errmsg] = fopen('file.txt', 'a');
assert(fid > 0, 'Failed to open file because: %s', errmsg);
And see what error you get.

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