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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: [mg33030] Re: [mg32995] How build a ?TestFuntion that applied to a list gives only the elements that are function of x
• From: Omega Consulting <omega_consulting at yahoo.com>
• Date: Tue, 26 Feb 2002 04:35:25 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

At 01:38 AM 2/23/2002, 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

TestFuntion[expr_] := !FreeQ[expr, x]

Then

Select[{Sin[a x], b x, t, c r}, TestFuntion]

or

Cases[{Sin[a x], b x, t, c r}, _?TestFuntion]

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