       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 || #[] == 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
>
>
> ---------------------------------------------
> This message was sent using Endymion MailMan.
> http://www.endymion.com/products/mailman/
>
>
>
>
>

```

• Prev by Date: arranging a list
• Next by Date: Re: Factorization
• Previous by thread: Testing that the elements are a list are exponential
• Next by thread: Re: Testing that the elements are a list are exponential