| Re: accessing structures [message #6471] |
Mon, 01 July 1996 00:00 |
offenbrg
Messages: 31
Registered: August 1993
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Member |
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kachun@bogart.Colorado.EDU (Ka Chun Yu) writes:
> My question is then how would I pull out what I need to know from
> !version if I didn't know the names for the individual components
> (i.e., "!version.arch", "!version.os")? Is there a command that
> can pull out what I need, like this example below?
> IDL> print,MYSTERY_COMMAND(!version,0)
> sparc
IDL> help,/STRUCTURE, !version
** Structure !VERSION, 4 tags, length=32:
ARCH STRING 'sparc'
OS STRING 'sunos'
OS_FAMILY STRING 'unix'
RELEASE STRING '4.0.1'
-Joel
--
"...And I am unanimous in this" - Mrs. Slocumbe
------------------------------------------------------------ ----------
| Joel D Offenberg | offenbrg@fondue.gsfc.nasa.gov |
| Hughes STX, NASA/GSFC/LASP | UIT Sci team & COBE Unix SysAdm |
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| Re: accessing structures [message #6475 is a reply to message #6471] |
Sun, 30 June 1996 00:00  |
brian.jackel
Messages: 23
Registered: May 1996
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Junior Member |
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In article <4r48vn$jpu@lace.colorado.edu> kachun@bogart.Colorado.EDU (Ka Chun Yu) writes:
> Does anyone know how to access parts of structures in IDL? Looking
> up the version of IDL, I can type:
> IDL> print,!version
> { sparc sunos 3.6.1}
> I can't directly access the individual components, since a help will
> give:
> IDL> help,!version
> <Expression> STRUCT = -> !VERSION Array(1)
For this, try HELP,/STRUCT,!version
which gives something like:
** Structure !VERSION, 4 tags, length=32:
ARCH STRING 'x86'
OS STRING 'Win32'
OS_FAMILY STRING 'Windows'
RELEASE STRING '4.0.1'
Also handy are the routines:
N_TAGS(!version) which returns the number of tags in the structure
TAG_NAMES(!version) which gives an array of strings containing the tag names
Finally, tags can also be referenced by:
!version.(0) which is the same as !version.arch
!version.(1) !version.os
etc.
Hope this helps.
Brian Jackel
University of Western Ontario
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| Re: accessing structures [message #6476 is a reply to message #6475] |
Sun, 30 June 1996 00:00 |
pit
Messages: 92
Registered: January 1996
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Member |
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In article <4r48vn$jpu@lace.colorado.edu>,
kachun@bogart.Colorado.EDU (Ka Chun Yu) writes:
> My question is then how would I pull out what I need to know from
> !version if I didn't know the names for the individual components
> (i.e., "!version.arch", "!version.os")? Is there a command that
> can pull out what I need, like this example below?
>
> IDL> print,MYSTERY_COMMAND(!version,0)
> sparc
IDL> print,tag_names(!version)
ARCH OS OS_FAMILY RELEASE
Peter
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~
Peter "Pit" Suetterlin http://www.uni-sw.gwdg.de/~pit
Universitaets-Sternwarte Goettingen
Tel.: +49 551 39-5048 pit@uni-sw.gwdg.de
-- * -- * ...-- * -- * ...-- * -- * ...-- * -- * ...-- * -- * ...-- * --
Come and see the stars! http://www.kis.uni-freiburg.de/~ps/SFB
Sternfreunde Breisgau e.V. Tel.: +49 761 278588
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