MATLAB Answers

How do I pass a filename to a routine in Matlab's command window?

4 views (last 30 days)
Harald von der Osten
Harald von der Osten on 19 Sep 2021
Edited: Jan on 23 Sep 2021 at 9:09
In the Matlab Command window I would like to run a function with an input parameter, like this:
>> xxxreplace oldGEOPLOT
s =
"./html/oldGEOPLOT.html"
Error using fread
Invalid file identifier. Use fopen to generate a valid file identifier.
Error in xxxreplace (line 14)
ff=fread(fid,'*char')';
I'm using this code :
function file=xxxreplace(x)
f=string(x);
s=strcat('./html/',f,'.html')
fid=fopen(s,'r');
ff=fread(fid,'*char')';
fclose(fid);
ff =strrep(ff,'.png" alt="">','.png" alt="" width="360">');
fid=fopen('./html/new.html','w');
fprintf(fid,'%s',ff);
fclose(fid);
disp(s)
end
Why do I get this error?
Thanks a lot,
Harry
  4 Comments

Sign in to comment.

Accepted Answer

Jan
Jan on 19 Sep 2021
Edited: Jan on 23 Sep 2021 at 9:09
The error message is clear: The file does not exist. Although you assume, that the current folder is the same, this is not true. Check this explicitly:
function file = xxxreplace(x) % What is "file"?
s = fullfile('./html/', [x, '.html']);
[fid, msg] = fopen(s, 'r');
assert(fid > 0, msg);
ff = fread(fid,'*char')';
fclose(fid);
ff = strrep(ff,'.png" alt="">','.png" alt="" width="360">');
[fid, msg] = fopen('./html/new.html', 'w');
assert(fid > 0, msg);
fprintf(fid, '%s', ff);
fclose(fid);
end
Trusting on the current folder is a bad programming practice. Any timer or gui callback might change the current folder unexpectedly. Prefer to use absolute file names.
  3 Comments
Harald von der Osten
Harald von der Osten on 19 Sep 2021
hey, now it works:
changing
s = fullfile('./html/', [f, '.html']);
to
s = fullfile('./html/', [x, '.html']);
made obviously the job. Thanks to all who helped me !!

Sign in to comment.

More Answers (0)

Tags

Products


Release

R2021a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by