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

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Irfan Ibrahim Yeniceri
评论： Voss 2022-4-2
I want my function to return -1 when the file doesn't open. But this happens

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采纳的回答

Voss
Voss 2022-4-2
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.
  2 个评论
Irfan Ibrahim Yeniceri
Irfan Ibrahim Yeniceri 2022-4-2
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.

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更多回答（1 个）

Riccardo Scorretti
编辑：Riccardo Scorretti 2022-4-2
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

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