Re: Pattern Matching Question
- To: mathgroup at smc.vnet.net
- Subject: [mg116724] Re: Pattern Matching Question
- From: Just A Stranger <forpeopleidontknow at gmail.com>
- Date: Fri, 25 Feb 2011 06:35:04 -0500 (EST)
Cool, thanks guys. So many ways of doing it! :) I think I'm starting to get how pattern matching works. On 02/24/2011 06:29 AM, Scot T. Martin wrote: > One way would be with PatternTest[...], abbreviated as ?. > > For instance, Power[x,_?AtomQ] would match for Power[x,5] but not Power[x,Plus[_,_]]. That might be what you're looking for. > > If you are looking for something more advanced, you might need to go with Power[x,_?(Head[#]!=Plus&)] > > > -----Original Message----- > From: Just A Stranger [mailto:forpeopleidontknow at gmail.com] > Sent: Thursday, February 24, 2011 06:24 > To: mathgroup at smc.vnet.net > Subject: [mg116702] Pattern Matching Question > > I'm new to pattern matching, and am stuck on a seemingly simple probem: > > If I want to transform a pattern like > > (I) Power[x,_] i.e. x^_ > > but NOT > > (II) Power[x,Plus[_,_]] i.e. x^(_+_) > > How would I go about making that rule? > > x^_ -> NewForm > > Applies the rule to (II), which I don't want. > > Thank you for your help :) > > >