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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.

> 




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