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matlab fprintf error? please help

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Sojung Youn
Sojung Youn on 28 Sep 2020
Commented: Walter Roberson on 29 Sep 2020
Hi all,
I am very very new to matlab, and I am trying to run a script that will read my txt files and write it on my xlsx file. I have about 120 txt files, so I am trying to run a script on them, but I keep having this fprintf error on a part of my script.
fid = fopen(sprintf('%s/Timeseries.ROIs/%s_timeseries.xlsx',rootdir,rois{roi}),'w');
colhdrs = {'Subject','Group','Gender','Subject','Condition','-4.4', '-2.2', '0', '2.2', '4.4', '6.6', '8.8', '11', '12.2'};
fprintf(fid,'%s\t',colhdrs{:}); fprintf(fid,'\n');
I keep facing an error with the script line below.
frpintf(fid, '%s \ t', colhdrs {:});
saying that it has Invalid file identifier. Use fopen to generate a valid file identifier.
Again, I am very new so any help would be much appreciated. Thank you so much!

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Answers (1)

per isakson
per isakson on 29 Sep 2020
Most likely, fid = fopen(...), failed and return a negative value to fid.
Replace
fid = fopen(sprintf('%s/Timeseries.ROIs/%s_timeseries.xlsx',rootdir,rois{roi}),'w');
by
ffs = fullfile( rootdir, 'Timeseries.ROIs', [rois{roi},'_timeseries.xlsx'] );
[fid,msg] = fopen( ffs, 'w' );
and run the script and inspect the values of ffs, fid and msg.

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Walter Roberson
Walter Roberson on 29 Sep 2020
And remember that when you fopen() a file for 'w', that the underlying operating system will not automatically create any missing directories. If rootdir is not a directiory, or if Timeseries.ROIs is not a directory within rootdir, then the fopen() would fail.

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