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Re: Passing zero as a Parameter/ NOT KEYWORD_SET [message #16093 is a reply to message #16087]

Tue, 29 June 1999 00:00

philaldis
Messages: 32
Registered: March 1999

Member

On Mon, 28 Jun 1999 10:02:49 -0400, Grady Daub
<gadZOOKS8371@garnet.acns.fsuMMER.edu> wrote:

> Will n_elements give a number <= zero if the keyword is called like
> "/keyword"
>

No.

N_Elements() returns the number of elements in a variable. If that
variable was a (10,10) array then N_Elements would return 100. If
however the variable is undefined (which of course is its own special
variable type in IDL), then N_Elements returns 0.

If the keyword is set, but set to a negatove number then N_Elements
will return will return a poitive number of elements still. If the
parameter is simply a flag then you're much better off with the
Keywrod_Set() EQ 0 idea.

Cheers,
Phil

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[Message index]

		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: J.D. Smith on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Vapuser on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: R.Bauer on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Martin Schultz on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Liam Gumley on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: philaldis on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: R.Bauer on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Pavel Romashkin on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: davidf on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: J.D. Smith on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: J.D. Smith on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: davidf on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Martin Schultz on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: R.Bauer on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: davidf on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: J.D. Smith on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Andy Sowter on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: philaldis on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Grady Daub on Mon, 28 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Grady Daub on Mon, 28 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: philaldis on Mon, 28 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: luthi on Mon, 28 June 1999 00:00

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