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Re: How build a ?TestFuntion that applied to a list gives only the elements that are function of x

  • To: mathgroup at smc.vnet.net
  • Subject: [mg33009] Re: How build a ?TestFuntion that applied to a list gives only the elements that are function of x
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 26 Feb 2002 04:34:48 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <a57hmf$2l4$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,


what's wrong with :

Select[{Sin[a x], b x, t, c r}, ! FreeQ[#, x] &]

that you need a rule and a relacement ?

Regards
  Jens


"J. Guillermo Sanchez" wrote:
> 
> How build a ?TestFuntion that applied to a list give only the elements
> that are function of x
> 
> Example:
> 
> In[]:= {Sin[a x], b x, t, c r}/.?TestFuntion
> 
> gives
> 
> Out[] = {Sin[a x], b x}
> 
> Thanks
> 
> Guillermo Sanchez


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