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substitution within a substitution list

• To: mathgroup at smc.vnet.net
• Subject: [mg88551] substitution within a substitution list
• From: Bipin <bipin.caz at googlemail.com>
• Date: Thu, 8 May 2008 04:13:41 -0400 (EDT)

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.

• Follow-Ups:
  • Re: substitution within a substitution list
    • From: Christopher Carlson <carlson@wolfram.com>
  • Re: substitution within a substitution list
    • From: "Thomas Dowling" <thomasgdowling@gmail.com>
  • Re: substitution within a substitution list
    • From: "Adriano Pascoletti" <adriano.pascoletti@gmail.com>