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Test for "valid variable"

• To: mathgroup at smc.vnet.net
• Subject: [mg61659] Test for "valid variable"
• From: Marcus Stollsteimer <marcus314 at yahoo.com>
• Date: Mon, 24 Oct 2005 21:07:20 -0400 (EDT)
• Organization: Comp.Center (RUS), U of Stuttgart, FRG
• Sender: owner-wri-mathgroup at wolfram.com

Hi group,

I would like to test whether some parameters of functions are
"valid variables", similar like e.g. in FourierTransform:

  FourierTransform[t UnitStep[t], t, 1]

  General::ivar: 1 is not a valid variable.

Is a test for the head "Symbol" the right thing to do?

Best regards,
Marcus

-- 
I would have to ask the questioner. I haven't had a chance
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