Re: Function to detect presence of a variable in
- To: mathgroup at smc.vnet.net
- Subject: [mg109440] Re: Function to detect presence of a variable in
- From: David Bailey <dave at removedbailey.co.uk>
- Date: Tue, 27 Apr 2010 04:06:43 -0400 (EDT)
- References: <hr1584$a82$1@smc.vnet.net> <hr3k55$c3g$1@smc.vnet.net>
Raffy wrote:
>
> Position produces results valid for Extract:
>
> Extract[anything, {{}}] === anything, since: Part[anything] ===
> anything
>
Except that unfortunately Extract doesn't seem to work in this case:
In[511]:= Extract[foo[a, b, c], {}]
Out[511]= {}
David Bailey
http://www.dbaileyconsultancy.co.uk