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MathGroup Archive 2007

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Re: Replace certain variable

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74835] Re: Replace certain variable
  • From: "januswesenberg at gmail.com" <januswesenberg at gmail.com>
  • Date: Sat, 7 Apr 2007 04:04:47 -0400 (EDT)
  • References: <ev51a7$a63$1@smc.vnet.net>

On Apr 6, 2:44 am, "KFUPM" <hussain.alqaht... at gmail.com> wrote:
> Dear Group
>
> If i have a term like : F[w]*Exp[I*w*t] where F[w] is an arbitrary
> function, and i want to replace w by x+ s*a only in the exponent not
> in F[w], i wonder what is the quickest and easiest way to do it
> provided that i have so many similar terms.
>
> Your help and prompt reply is highly appreciated.
>
> HMQ

There are many ways. The simplest is probably a delayed rule:
expr = F[w] Exp[I w t];
expr /. Exp[arg_] :> Exp[arg /. w -> x s + a]

Gives
E^(I*t*(a + s*x))*F[w]

/Janus



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