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Test for "valid variable"

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

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,

I would have to ask the questioner. I haven't had a chance
to ask the questioners the question they've been questioning.
   -- George W. Bush

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