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Re: How to see if variable is defined? [message #3450 is a reply to message #3359]

Mon, 23 January 1995 07:47

thompson
Messages: 584
Registered: August 1991

Senior Member

rfinch@water.ca.gov (Ralph Finch) writes:

> Is there a nice way of checking if a variable is defined?

> I have a widget_control command which removes a menu, and I need to
> see if the menu is defined before destroying it.

You can always use

IF N_ELEMENTS(variable) NE 0 THEN ...

Bill Thompson

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[Message index]

		How to see if variable is defined? By: rfinch on Fri, 20 January 1995 09:43
		Re: How to see if variable is defined? By: zawodny on Thu, 26 January 1995 12:28
		Re: How to see if variable is defined? By: nmw on Thu, 26 January 1995 03:18
		Re: How to see if variable is defined? By: thompson on Fri, 27 January 1995 06:49
		Re: How to see if variable is defined? By: rep2857 on Tue, 24 January 1995 08:22
		Re: How to see if variable is defined? By: ps on Thu, 26 January 1995 09:47
		Re: How to see if variable is defined? By: thompson on Mon, 23 January 1995 07:47

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