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Re: checking if variable is defined [message #24759 is a reply to message #24625]

Thu, 12 April 2001 05:19

Bernard Puc
Messages: 65
Registered: January 1998

Member

Dominik wrote:
>
> Helle there,
>
> I would like to plot a variable, but only if it is existing. When the
> Variable is undefined, nothing should happen. So I am searching for an
> expression for the if statement. Does anybody know an expression like:
> if ( vaiable_name existing) then...

One way to do this is with the N_ELEMENTS() function:

if (n_elements( variable ) GT 0) then print,'Variable exists'

--
Bernard Puc AETC, INC.
bpuc@va.aetc.com 1225 Jefferson Davis Highway #800
(703) 413-0500 Arlington, VA 22202

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[Message index]

		checking if variable is defined By: Dominik[1] on Wed, 11 April 2001 08:47
		Re: checking if variable is defined By: Bernard Puc on Thu, 12 April 2001 05:19
		Re: checking if variable is defined By: davidf on Wed, 11 April 2001 09:59

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