Testing that the elements are a list are exponential
- To: mathgroup at smc.vnet.net
- Subject: [mg32178] Testing that the elements are a list are exponential
- From: guillerm at usal.es
- Date: Fri, 4 Jan 2002 05:03:53 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
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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