Problem writing text to file with fprintf
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Hi, So.. I have a 727x1 cell array: A, that I'm trying to write to a file called 'norm1.avl' in the following manner:
fid = fopen('norm1.avl', 'w');
fprintf(fid, '%s\n' A{:});
fclose(fid);
Why is this not working? I am seriously going crazy here. Can't find the error. Thanks in advance!
3 Comments
Answers (3)
Image Analyst
on 11 Feb 2016
What if you try it this way:
fid = fopen('norm1.avl', 'wt');
for row = 1 : length(A)
fprintf(fid, '%s\n' A{row});
end
fclose(fid);
All cells in A contain strings, right?
3 Comments
Image Analyst
on 11 Feb 2016
I don't know how fileread() works, but it looks like maybe it keeps the file open so you can't open it again with fopen().
Guillaume
on 11 Feb 2016
I'd be more inclined to blame the issue on files permissions or on an antivirus than on fileread.
That would be a very bad bug if fileread left open file handles.
Star Strider
on 11 Feb 2016
First, see if changing the fopen call to:
fid = fopen('norm1.avl', 'wt');
specifying that the permission is to ‘write text’.
Second, if that doesn’t work, before you do the fopen call to open the ‘norm1.avl’ file for writing, insert this code snippet:
fIDs = fopen('all');
for k1 = 1:length(fIDs)
open_filename{k1} = fopen(fIDs(k1));
end
The ‘fIDs’ variable will have the file ids of all open files, and the ‘open_filename’ will have the full paths and names of all the open files. It’s possible that fileread has not closed the file.
2 Comments
Image Analyst
on 11 Feb 2016
Maybe try
fclose('all');
if you're certain that there is nothing you want or expect to be open.
Guillaume
on 11 Feb 2016
Note that specifying 't' in the fopen call only changes the way matlab translates '\n'. It should have no effect on whether the fopen succeeds or not.
Guillaume
on 11 Feb 2016
Have you checked that the file you're trying to modify actually has write permissions, and is not read only?
Does fileattrib('norm1.avl') returns UserExecute: 1 ?
Have you looked at what ferror(fid) returns after the fopen fails (assuming that is the problem, you still haven't told us what the actual problem is).
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