| Re: SAVE/RESTORE of sysvars (was IDL and X and PS) [message #590] |
Wed, 16 September 1992 13:06 |
knight
Messages: 37
Registered: January 1992
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In article <1992Sep16.162635.11002@colorado.edu>, ali@anchor.cs.colorado.edu (Ali Bahrami) writes:
|> In article <15SEP199217204994@stars.gsfc.nasa.gov>, knight@ll.mit.edu (Fred Knight) writes:
|> > Thanks to Bill for sharing the setplot routine.
|> > Another way to store the system variables is to write them to a save file:
|> >
|> > save,/sys
|> >
|> > and then recall them later:
|> >
|> > restore
|>
|> This will certainly work. It is, however, moderately fragile because
|> we (RSI) don't give any assurances that system variables won't change
|> in an upwardly compatible way between releases. If for example, we add
|> a new field to a system variable, your existing SAVE/RESTORE copy
|> of that variable will no longer be restorable. IDL issues an error,
|> skips the saved variable, and continues restoring anything else in the
|> SR file.
I think your comments are apropos. Indeed, they are the reasons I have not
relied on S/R with system variables for archival data. However, for the case
that Bill considered, namely switching between devices and saving system
variables related to plotting to be restored later in *one* IDL session, I
think the S/R construct is straightforward, simple and appropriate. It allows
a succinct way to recall the state of plotting variables for another device.
|>
|> With the clarity afforded by hindsight, allowing S/R on system variables
|> was probably a mistake on our part. In any event, I would suggest a
|> different approach, perhaps using a startup file to set system variable
|> preferences.
|>
|> - Ali, RSI (ali@rsinc.com)
With the clarity of foresight, I'm glad you *did* allow the S/R capability,
even though it leaves open the possibility of using save/sys for archival
purposes which seems prone to error.
Fred
--
=Fred Knight (knight@ll.mit.edu) (617) 981-2027
C-483\\MIT Lincoln Laboratory\\244 Wood Street\\Lexington, MA 02173
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