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MathGroup Archive 2002

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RE: How To Change A Rule

  • To: mathgroup at smc.vnet.net
  • Subject: [mg32360] RE: [mg32334] How To Change A Rule
  • From: "David Park" <djmp at earthlink.net>
  • Date: Wed, 16 Jan 2002 03:30:16 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Ariel,

{s1 -> -11, s2 -> 12} /. (x_ -> y_?Negative) -> x -> -y
{s1 -> 11, s2 -> 12}

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/


> From: Ariel Fligler [mailto:ariel.fligler at cellpay.biz]
To: mathgroup at smc.vnet.net
>
> Greetings,
>
> I'm quite newby to Mathematica programming and will thank you if you could
> help me solve the following:
>
> I have a list of rules of the form:
> {s1->-11, s2->12}
> And would like to change every rule in the list that it's RHS is
> negative to
> 0 so that I will get:
> {s1->0, s2->12}
> I tried to find an access function to manipulate rules but could not.
>
> Any help ?
>
> TIA,
>
> Ariel.
>
>



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