I want my function to return -1 when the file doesn't open.

I want my function to return -1 when the file doesn't open. But this happens

Answer 1

[Voss]

Your code is explicitly throwing the error, here:

error('error opening file %s\n',fname);

You can remove that line (and the next one because there is no need to close a file that's not open), so that that part looks like this:

if fid < 0
    charnum = -1;
    return
end

Then the function will return -1 in that case.

[Irfan Ibrahim Yeniceri]

Thank you so much. I have been dealing with this for hours. I removed each one individually but i didn't try to removed them both. Thank you again.

[Voss]

You're welcome!

Answer 2

[Riccardo Scorretti]

Hi. You must return just after assigning the value -1 to charnum. If you call the function error... well, you get an error message and the program stops. Use warning instead.

if fid == -1
  charnum = -1;
  warning('error opening file %s', fname);
  return
end

[Irfan Ibrahim Yeniceri]

Thank you for your respond. I solved the issue.