| Re: IDLv5.4 (SAVE bug?) [message #23051] |
Wed, 27 December 2000 11:06 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Wayne Landsman (landsman@my-deja.com) writes:
> I think the problem is more fundamental than this. Here is an example
> where I cannot restore a single scalar variable saved in V5.4, if I use
> V5.3 on the same (Solaris) machine.
>
> I presume this is a bug in IDL V5.4 (and another reason to hold off
> until V5.4.1?) If the save file format has changed, then presumably
> there should be an /OLD keyword to allow one to write variables that can
> be read by earlier versions of IDL.
I think you are right, Wayne. I confirm this behavior
on my Windows NT machine. I know that the people who
work on this are adamant that saved data files be
backwards compatible. This certainly looks like a bug
to me.
Do you have plans to confirm this with RSI?
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: IDLv5.4 (SAVE bug?) [message #23053 is a reply to message #23051] |
Wed, 27 December 2000 09:13  |
landsman
Messages: 93
Registered: August 1991
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Member |
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In article <MPG.14b3bd1a7e5de2f1989cd3@news.frii.com>,
davidf@dfanning.com (David Fanning) wrote:
> Saved data should definitely be compatible. If structure
> definitions change from one version to another, there
> could be minor problems. Have you tried setting the
> RELAXED_STRUCTURE_DEFINITION keyword when you restore?
I think the problem is more fundamental than this. Here is an example
where I cannot restore a single scalar variable saved in V5.4, if I use
V5.3 on the same (Solaris) machine.
I presume this is a bug in IDL V5.4 (and another reason to hold off
until V5.4.1?) If the save file format has changed, then presumably
there should be an /OLD keyword to allow one to write variables that can
be read by earlier versions of IDL.
--Wayne Landsman landsman@mpb.gsfc.nassa.gov
mpb{landsman}172: idl
IDL Version 5.4 (sunos sparc). (c) 2000, Research Systems, Inc.
IDL> a =3
IDL> save,a, /verbose
% SAVE: Portable (XDR) SAVE/RESTORE file.
% SAVE: Saved variable: A.
IDL> exit
mpb{landsman}924: idl53
IDL Version 5.3 (sunos sparc). (c) 1999, Research Systems, Inc.
IDL> restore,/ver
% RESTORE: Portable (XDR) SAVE/RESTORE file.
% RESTORE: Save file written by landsman@mpb, Wed Dec 27 12:02:16 2000.
% RESTORE: IDL version 5.4 (sunos, sparc).
% RESTORE: Unexpected item code found in save file.
IDL> help,a
A UNDEFINED = <Undefined>
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