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Re: getting structure elements by tag name string [message #33496 is a reply to message #33495]

Wed, 08 January 2003 05:01

Karsten Rodenacker
Messages: 98
Registered: July 1997

Member

s@visita2.die.upm.es schrieb:
> Hi all,
>
> I try to use a structure as a bad substitute for a hash map (hashs or
> associative lists or dictionaries or anything similar don't exist in
> IDL, do they?)
>
> Suppose I have a structure like this:
> s = {a:7,b:9}
>
> and I have a variable that contains a tag name:
> tag = 'a'
>
> Now I want to put the value of the structures element with name tag into a
> new variable called value:
> value = s.tag
>
> This doesn't work of course, because tag is undefined for this structure.
> But how can I get this the elements value?
>
> I found a somewhat crude way:
> res = execute('value =' + 's.' + tag)
>
> That works, but it's really ugly. Is there a better way to do this?
>
> And, is there a way to delete an element from a structure?
>
> Thanks for all tips,
>
> Sebastian
>

Try maybe

res=s.(where(strupcase(tag) eq tag_names(s))),/str

provided tag is really a tag name.

Regards

--
Karsten Rodenacker (LapTop)
------------------------------------------------------------ -------------:-)
GSF - Forschungszentrum Institute of Biomathematics and Biometry
D-85758 Oberschleissheim Postfach 11 29
Tel: +49 89 31873401 | FAX: ...3369 | Karsten@Rodenacker.de
http://www.gsf.de/ibb/

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[Message index]

		Re: getting structure elements by tag name string By: R.Bauer on Wed, 08 January 2003 09:41
		Re: getting structure elements by tag name string By: JD Smith on Wed, 08 January 2003 08:09
		Re: getting structure elements by tag name string By: David Fanning on Wed, 08 January 2003 05:40
		Re: getting structure elements by tag name string By: Karsten Rodenacker on Wed, 08 January 2003 05:04
		Re: getting structure elements by tag name string By: Karsten Rodenacker on Wed, 08 January 2003 05:01
		Re: getting structure elements by tag name string By: Pavel A. Romashkin on Thu, 09 January 2003 09:20

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