Re: substitution within a substitution list
- To: mathgroup at smc.vnet.net
- Subject: [mg88580] Re: [mg88551] substitution within a substitution list
- From: Christopher Carlson <carlson at wolfram.com>
- Date: Fri, 9 May 2008 03:23:10 -0400 (EDT)
- References: <200805080813.EAA14310@smc.vnet.net>
On May 8, 2008, at 3:13 AM, Bipin wrote: > HI, > > I'm trying to find a way of changing the substitution values within a > substitution list. > > For example, if I have the following substitution list:- > > subs = {a->1, b->2, c->2} > > I want to programmatically replace the value associated with 'b' from > 2 to 20, ie ending up with > > subs = {a->1, b->20, c->2} > > Does anyone know of a mathematica function for doing this? > > Bipin. You can use subs /. HoldPattern[b -> _] :> (b -> 20) or even something like subs /. HoldPattern[b -> x_] :> (b -> 10 x) Christopher Carlson User Interface Group Wolfram Research, Inc.
- References:
- substitution within a substitution list
- From: Bipin <bipin.caz@googlemail.com>
- substitution within a substitution list