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Re: calling a structure tag as a variable? [message #79443 is a reply to message #79441]

Mon, 27 February 2012 08:52

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

desertdryad wrote:
> Hi folks -
>
> I have a set of structure variables I use in a suite of programs. I
> need to run the same procedure on several different fields within that
> structure; where the only difference in how th eprocedure is used is
> the particualr field it operates on. But I don't want to do them 'all
> at once' either. I would like to be able to call the procedure in
> question by somehow making the tag name to operate on in the procedure
> a variable. But I don't think there is a way to do that in IDL?
>
> (did I explain my question understandably?)

How about something like:

PRO process_mystructure, $
mystructure, $ ; The structure
tag ; The tag name on which to operate

tag_idx = WHERE(TAG_NAMES(mystructure) EQ tag, count)
IF ( count NE 1 ) THEN MESSAGE, 'Invalid input tag'

; Pull out data to operate on
data = mystructure.(tag_idx[0])

....operate on data...calling separate, generic procedure?

; Stick it back in the structure
mystructure.(tag_idx[0]) = data

END

??

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[Message index]

		Re: calling a structure tag as a variable? By: desertdryad on Mon, 27 February 2012 11:28
		Re: calling a structure tag as a variable? By: Paul Van Delst[1] on Mon, 27 February 2012 09:06
		Re: calling a structure tag as a variable? By: Lajos Foldy on Mon, 27 February 2012 08:55
		Re: calling a structure tag as a variable? By: David Fanning on Mon, 27 February 2012 08:58
		Re: calling a structure tag as a variable? By: Paul Van Delst[1] on Mon, 27 February 2012 08:52

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