| Re: get variables name [message #19538 is a reply to message #19535] |
Wed, 05 April 2000 00:00   |
John-David T. Smith
Messages: 384
Registered: January 2000
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Senior Member |
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David Fanning wrote:
>
> R.Bauer (R.Bauer@fz-juelich.de) writes:
>
>> I like to know the name of a variable which is submitted as input to a
>> procedure
>>
>> e.g
>>
>> pro test,var
>> help,var
>> end
>>
>> a=1
>> test,a
>>
>> Is it possible to get inside test the information that test was called
>> with a.
>
> My life is totally out of control at the moment, so I haven't
> had the opportunity to write this up for my web page, but
> here is part of a correspondence I recently received from
> Paul Woodford, an IDL user, concerning the undocumented
> ROUTINE_NAMES function:
>
> routine_names(variables=0) - variable names at current level
> routine_names(variables=1) - variable names at main level
> routine_names(variables=2) - variable names at one level down from main
> routine_names(variables=-1) - variable names at one level up from current
> routine_names(variables=-2) - variable names at two levels up from current
>
> But wait, that's not all... Take a look at how routine_names is used in
> gethelp - you can use routine_names to actually fetch a variable from a
> different level. For instance, if you have a variable named 'blah' one
> level up from your current level, you can get it using
>
> blah_here = routine_names('blah', fetch=-1)
>
< wise cautionary matter clipped>
But wait... that'still not all!
By poking around in the library, I found:
pro foo,a
print,routine_names(a,/ARG_NAME)
end
IDL> foo,x
X
pretty cool. And this is the coolest... I've been asking for this for years...
easy to abuse, but oh so useful for sending variables to the command-line and
widget program...
Try this:
pro foo,a
g=12
print,routine_names("gvar",g,STORE=1)
end
IDL> foo
1
IDL> help
% At $MAIN$
GV INT = 12
Cool! This is the symmetric form of fetch, and I guess just returns 1 on
success. Finally I can create variables for later storage on the command line
within widget apps! Or what I mean to say... hmmph... I mean... don't play with
matches... bad dog...
JD
--
J.D. Smith |*| WORK: (607) 255-5842
Cornell University Dept. of Astronomy |*| (607) 255-6263
304 Space Sciences Bldg. |*| FAX: (607) 255-5875
Ithaca, NY 14853 |*|
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