How to check for availability of functions in core octave

[PhilipNienhuis]

Is there a user-function for checking if some function is present in core
Octave?
Something like  
  isimplemented ("erfcx")
?

I'm looking at pkg.m to see if some check can be implemented there to skip
copying m-files for which equivalent (and probably better) functionality is
in core octave. This is somewhat motivated by:

   http://sourceforge.net/mailarchive/message.php?msg_id=26792800

and some experiences with maintenance of octave-forge packages.

Philip

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