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Re: Picewise Function

• To: mathgroup at smc.vnet.net
• Subject: [mg82089] Re: Picewise Function
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Fri, 12 Oct 2007 02:47:50 -0400 (EDT)
• Organization: Uni Leipzig
• References: <fek98d$lae$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de

Hi,

how to find out that the function is undefined when the
"result of the evaluation is <= 0.25."
without evaluate it ??

Or may a simple

res= (est07[zve + kap] - est07[zve])/kap;
If[res<=1/4,Return[res],Return[Indeterminate]]

help ??

Regards
   Jens

Frank Hechtner wrote:
> hi,
> 
> I'm in trouble with a function. i created the following one
> (est07[zve + kap] - est07[zve])/kap (something about german taxes, 
> refers to other functions)
> 
> Now i want mathematica to tell that this function uses a specific 
> domain. The function should only be defined if the result of the 
> evaluation is <= 0.25.
> 
> Does anyone know how to realize this=?
> Thanks for help
> 
> frank
>