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Re: Define a variable [message #80498 is a reply to message #80352]

Wed, 13 June 2012 01:12

dplatten
Messages: 32
Registered: December 2007

Member

On Wednesday, June 13, 2012 8:07:58 AM UTC+1, hadi wrote:
> Hi
> I have a question about variable. How to determine if variable is
> 'undefined'? Thank you
> Best, Hadi

Try,

PRINT, N_ELEMENTS(x)

or, try

numElements = N_ELEMENTS(x)
PRINT, numElements

This method of checking whether a variable is defined is in the IDL help.

Regards,

David

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[Message index]

		Define a variable By: hadi on Wed, 13 June 2012 00:07
		Re: Define a variable By: dplatten on Wed, 13 June 2012 06:03
		Re: Define a variable By: hadi on Wed, 13 June 2012 01:40
		Re: Define a variable By: dplatten on Wed, 13 June 2012 01:12

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