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Re: Bug in N_PARAMS? [message #64010 is a reply to message #63986]

Mon, 24 November 2008 14:20

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Kenneth P. Bowman writes:

> I have been having some very odd problems with the N_PARAMS function lately.
> ...
> Am I missing something obvious here?

N_PARAMS only tells you *how many* parameters the
command is called with. It tells you nothing about
the *type* of the parameter. Since "undefined" is
a valid variable type in IDL, it is possible to
pass an "undefined" variable and have it counted
as a passed *number* of variables by N_PARAMS.

If you are concerned with if a variable is undefined
or not, you can't use N_PARAMS to determine this. The
only way to tell is to use N_ELEMENTS.

Cheers,

David
--
David Fanning, Ph.D.
Coyote's Guide to IDL Programming (www.dfanning.com)
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Bug in N_PARAMS? By: David Fanning on Wed, 26 November 2008 07:49
		Re: Bug in N_PARAMS? By: Carsten Lechte on Tue, 25 November 2008 23:53
		Re: Bug in N_PARAMS? By: Kenneth P. Bowman on Tue, 25 November 2008 06:29
		Re: Bug in N_PARAMS? By: David Fanning on Mon, 24 November 2008 14:20
		Re: Bug in N_PARAMS? By: Mark[1] on Thu, 27 November 2008 13:53
		Re: Bug in N_PARAMS? By: Brian Larsen on Tue, 02 December 2008 07:03
		Re: Bug in N_PARAMS? By: David Fanning on Wed, 03 December 2008 09:06

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