Re: Condition in replacement rule
- To: mathgroup at smc.vnet.net
- Subject: [mg67770] Re: Condition in replacement rule
- From: dh <dh at metrohm.ch>
- Date: Fri, 7 Jul 2006 07:12:36 -0400 (EDT)
- References: <e8iqu6$s6p$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi, Try: A[V_, W_] /; UnsameQ[V, W] -> A[V, V] + B[W] Daniel wandering.the.cosmos at gmail.com wrote: > I have a replacement rule that goes like > > A[V,W_] -> A[V,W] + B[W] > > but I want to perform this replacement if and only if V and W are not > the same. It seems > > A[V,W_/;W!=V] -> A[V,W] + B[W] > > does not seem to work. How should I do this? > > Thanks! >