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$Id: undefine.pro 163 2006-08-29 12:59:46Z navarro $
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trouve sur la page web de D.Fanning
http://www.dfanning.com :
QUESTION: How do I make an IDL variable have a type "undefined"?
ANSWER: At the main IDL level you can use the IDL procedure DELVAR to
delete an IDL variable and make it undefined. Inside of procedures
and functions, I use this little program named UNDEFINE that I got
from Andrew Cool at the DSTO High Frequency Radar Division in
Adelaide, Australia.
Produced by IDLdoc 2.0 on Wed Sep 13 16:33:14 2006.