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*: [mg32995] How build a ?TestFuntion that applied to a list gives only the elements that are function of x*From*: "J. Guillermo Sanchez" <guillerm at usal.es>*Date*: Sat, 23 Feb 2002 02:38:16 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

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

**Follow-Ups**:**RE: How build a ?TestFuntion that applied to a list gives only the elements that are function of x***From:*"Higinio Ramos" <higra@usal.es>

**Re: How build a ?TestFuntion that applied to a list gives onlythe elements that are function of x***From:*Tomas Garza <tgarza01@prodigy.net.mx>