Re: What to return on symbolic evaluation of own heads ?
- To: mathgroup@smc.vnet.net
- Subject: [mg12572] Re: What to return on symbolic evaluation of own heads ?
- From: Le Van Tri <lvtri@miller.cs.uwm.edu>
- Date: Mon, 25 May 1998 14:24:44 -0400
- Organization: University of Wisconsin - Milwaukee
- References: <6k7dfb$1la@smc.vnet.net>
You can use HoldForm like this: HoldForm[F[x]] to return the value. Tri. Andreas Keese wrote: > Hi, > ... > Of course, this doesn't work - while I can write F[0.5] and get a > correct result, I can't write F[x] as this results in an infinite > recursion --- but If I want to manipulate my data-object, I somehow > need to return the original object. E.G. I want to be able to write > F[x] /. x-> 3 > and have this evaluated as F[3]... > > What should I return in my evaluation-rule when the parameter is > symbolic ? > > Bye, > Andreas