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MathGroup Archive 2002

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Re: Testing that the elements are a list are exponential

  • To: mathgroup at smc.vnet.net
  • Subject: [mg32210] Re: [mg32178] Testing that the elements are a list are exponential
  • From: Andrzej Kozlowski <andrzej at tuins.ac.jp>
  • Date: Sun, 6 Jan 2002 03:38:25 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

On Friday, January 4, 2002, at 07:03  PM, guillerm at usal.es wrote:

"Is an exponential or zero"  is a bit vague but perhaps this will 
suffice:

F[x_?(# == 0 || # == E || #[[1]] == E &)]

Andrzej Kozlowski
Toyama International University
JAPAN
http://platon.c.u-tokyo.ac.jp/andrzej/

> Dear friends,
>
> I have a  make a function where  all element of a list  should
> be  exponentials or cero.
> Here is an example
>
> lst1 = { 0, 1.4 Exp [-3 t] + 1.2 Exp [- t], 0, 0.24 Exp [a t]}
>
> F[x_] := x /. a_*E^(s_*t) -> (a*(-1 + E^(s*t)))/s
>
> It works
>
> F[lst1]
>
> But I need define F[x_?Test] where ?Test check that  all element of 
> list  are
> exponentials or cero. How I can build the test?
>
> HNY every boy
>
> Guillermo Sanchez
>
>
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>



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