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Re: Define a function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg34566] Re: Define a function
  • From: Erk Jensen <Erk.Jensen at cern.ch>
  • Date: Wed, 29 May 2002 02:44:05 -0400 (EDT)
  • References: <acshar$ke2$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Michael Popp wrote:
> Hello
> 
> I want to define a function in Mathematica. But just f[x_]:=...  does not
> work, because I have to define different functions for different ranges of
> the variable x.
> For example:
> 
> x < 10:           f(x) = 0
> 10 < x < 20:  f(x) = x
> 20 < x:          f(x) = x/2
> 
> How to do this?
> 
> Thanks, greetings
> Michael
> 
> 
> 
> 

See in the online help under "Condition"; there's an example that looks like
f[x_] := fp[x] /; x > 1

  -erk-



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