Re: substitution within a substitution list
- To: mathgroup at smc.vnet.net
- Subject: [mg88601] Re: substitution within a substitution list
- From: dh <dh at metrohm.ch>
- Date: Fri, 9 May 2008 03:27:04 -0400 (EDT)
- References: <fvudmu$ebg$1@smc.vnet.net>
Hi Bipin,
you need HoldPattern for this. E.g.:
subs/.HoldPattern[b->x_]->b->10 x
hope this helps, Daniel
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.
>