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Re: Novice question. [message #22268 is a reply to message #22267]

Thu, 26 October 2000 05:22

Peter Clinch
Messages: 98
Registered: April 1996

Member

Randall Skelton wrote:

> I can set x=1.0 and y=2.0 at the command prompt but how do I then clear or
> reset the x and y variables after this? Better still, how do I do this to
> all the variables which I've defined in a program/function?

RTFM references you want are probably "delvar", ".reset_session" ;-)

Though note you can assign new values to variables without clearing them
first, as in most languages. Since IDL isn't particularly rigid with
types (i.e., easier to move between them, and easier to get weird errors
as a result of doing it by mistake!), you can set different types on the
fly, so...

IDL> x=1.0
IDL> help,x
X FLOAT = 1.00000
IDL> x=2
IDL> help,x
X INT = 2

IDL> delvar,x
IDL> help,x
X UNDEFINED = <Undefined>

IDL> x='hello'
IDL> y=x
IDL> help,x,y
X STRING = 'hello'
Y STRING = 'hello'
IDL> .reset_session
IDL> help,x,y
X UNDEFINED = <Undefined>
Y UNDEFINED = <Undefined>

HTH, Pete.
--
Peter Clinch University of Dundee
Tel 44 1382 660111 ext. 33637 Medical Physics, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net p.j.clinch@dundee.ac.uk http://www.dundee.ac.uk/~pjclinch/

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		Re: Novice question. By: promashkin on Thu, 26 October 2000 15:03
		Re: Novice question. By: davidf on Thu, 26 October 2000 05:40
		Re: Novice question. By: Peter Clinch on Thu, 26 October 2000 05:22

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