Help with conditional rules
- To: mathgroup at christensen.Cybernetics.NET (mathgroup )
- Subject: Help with conditional rules
- From: leboeuf at ere.umontreal.ca (Leboeuf Martin)
- Date: Tue, 25 Oct 1994 13:58:57 -0400 (EDT)
Let me first thank Steve for his excellent work with mathgroup,
and I can only be forever thankfull to him for maintaining
such a valuable forum.
Here is now my problem. I generate functions of the type:
In other words, functions all with the same Head FUNC and
with 6 Integer arguments. Now, depending upon the value of those
arguments, I want to substitute the Head. For example:
FUNC[2,2,2,0,3,1] /. FUNC :> F1 /; FUNC[2,2,2,0,3,1][] +
FUNC[2,2,2,0,3,1][] == 6
and I get:
which would be OK for me. But I have hundreds of FUNC's, so I would
like the above rule to work for any given FUNC. I tried
FUNC[2,2,2,0,3,1] /. FUNC :> F1 /; FUNC[i_,j_,k_,l_,m_,n_][] +
FUNC[i_,j_,k_,l_,m_,n_][] == 6
and other similar things, but obviously without success.
To be more general, how can one define a rule (or whatever) to
extract the nth argument of a function with a fixed (or undefined)
number of arguments?
leboeuf at ere.umontreal.ca
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