How do I delete a single file?

[eluser]Unknown[/eluser]
Hey guys.

I've just recently started to learn CodeIgniter and have just begun playing with the file uploading class. I've been looking around a bit for how I can delete a single file which has been uploaded but all I've found is the function

Code:

delete_files()

which deletes all files in a directory..

So, how should I delete a single file?