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Re: replace one rule in a list of rules

• To: mathgroup at smc.vnet.net
• Subject: [mg125570] Re: replace one rule in a list of rules
• From: Alan <alan.isaac at gmail.com>
• Date: Mon, 19 Mar 2012 04:57:58 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <jk1fv4$515$1@smc.vnet.net> <jk44fj$e40$1@smc.vnet.net>

Using Murray's approach I end up with (for example):

Clear[a, b, c]
rules = Thread[{a, b, c} -> {0.1, 0.1, 0.1}]
Table[rules /. ((b -> _) -> (b -> i/10.)), {i, 0, 10}]

Using Peter's approach I end up with (for example):

Clear[a, b, c]
rules = Thread[{a, b, c} -> {0.1, 0.1, 0.1}]
Table[(rules /. HoldPattern[b -> _] :> b -> i/10.), {i, 0, 10}]

Both appear to meet my needs. I'm not sure what the real
difference between the two is.

Thanks,
Alan


Thanks!
Alan

• Follow-Ups:
  • Re: replace one rule in a list of rules
    • From: Christoph Lhotka <christoph.lhotka@fundp.ac.be>