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Re: Name of arrays [message #79330 is a reply to message #79269]

Tue, 21 February 2012 06:50

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

Senior Member

Craig Markwardt wrote:
> On Feb 20, 1:15 pm, Brian Wolven <brian.wol...@gmail.com> wrote:
>> Or create_struct, using the month as the tag name, for pretty much any version of IDL.
>
> +1.

and once more: +1.

To the OP, it's quite easy to modify structures as you go - as long as you use anonymous structure. So in your case you
could do something like:

IDL> t = findgen(31)
IDL> month_data = create_struct('january', t)
IDL> help, month_data
** Structure <9430c3c>, 1 tags, length=124, data length=124, refs=1:
JANUARY FLOAT Array[31]
IDL> print, month_data.january
0.00000 1.00000 2.00000 3.00000 4.00000 5.00000 6.00000
7.00000 8.00000 9.00000 10.0000 11.0000 12.0000 13.0000
14.0000 15.0000 16.0000 17.0000 18.0000 19.0000 20.0000
21.0000 22.0000 23.0000 24.0000 25.0000 26.0000 27.0000
28.0000 29.0000 30.0000
IDL> t = findgen(28)+10.
IDL> month_data = create_struct(month_data,'february', t)
IDL> help, month_data
** Structure <9430f6c>, 2 tags, length=236, data length=236, refs=1:
JANUARY FLOAT Array[31]
FEBRUARY FLOAT Array[28]
IDL> print, month_data.february
10.0000 11.0000 12.0000 13.0000 14.0000 15.0000 16.0000
17.0000 18.0000 19.0000 20.0000 21.0000 22.0000 23.0000
24.0000 25.0000 26.0000 27.0000 28.0000 29.0000 30.0000
31.0000 32.0000 33.0000 34.0000 35.0000 36.0000 37.0000

It's like a poor man's hash, e.g.:

IDL> print, month_data.(where(tag_names(month_data) EQ 'FEBRUARY'))
10.0000 11.0000 12.0000 13.0000 14.0000 15.0000 16.0000
17.0000 18.0000 19.0000 20.0000 21.0000 22.0000 23.0000
24.0000 25.0000 26.0000 27.0000 28.0000 29.0000 30.0000
31.0000 32.0000 33.0000 34.0000 35.0000 36.0000 37.0000

cheers,

paulv

p.s. I reckon it's worth upgrading to v8.* to get access to IDL's HASH:

IDL> month_data=HASH()
IDL> help, month_data
MONTH_DATA HASH <ID=1 NELEMENTS=0>
IDL> month_data['January']=findgen(31)
IDL> month_data['February']=findgen(28)+10
IDL> help, month_data
MONTH_DATA HASH <ID=1 NELEMENTS=2>
IDL> print, month_data['February']
10.0000 11.0000 12.0000 13.0000 14.0000 15.0000 16.0000
17.0000 18.0000 19.0000 20.0000 21.0000 22.0000 23.0000
24.0000 25.0000 26.0000 27.0000 28.0000 29.0000 30.0000
31.0000 32.0000 33.0000 34.0000 35.0000 36.0000 37.0000

It's just simpler.

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[Message index]

		Name of arrays By: Israel Rodriguez Herm on Sun, 19 February 2012 04:30
		Re: Name of arrays By: David Fanning on Wed, 22 February 2012 08:34
		Re: Name of arrays By: Israel Rodriguez Herm on Thu, 23 February 2012 03:40
		Re: Name of arrays By: Brian Wolven on Wed, 22 February 2012 08:22
		Re: Name of arrays By: David Fanning on Wed, 22 February 2012 05:28
		Re: Name of arrays By: Israel Rodriguez Herm on Wed, 22 February 2012 02:04
		Re: Name of arrays By: penteado on Thu, 23 February 2012 07:08
		Re: Name of arrays By: Brian Wolven on Tue, 21 February 2012 14:53
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 14:44
		Re: Name of arrays By: Paul Van Delst[1] on Tue, 21 February 2012 14:35
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 14:33
		Re: Name of arrays By: penteado on Tue, 21 February 2012 14:27
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 14:21
		Re: Name of arrays By: penteado on Tue, 21 February 2012 14:02
		Re: Name of arrays By: Israel Rodriguez Herm on Thu, 23 February 2012 16:12
		Re: Name of arrays By: penteado on Tue, 21 February 2012 14:11
		Re: Name of arrays By: Paul Van Delst[1] on Tue, 21 February 2012 14:09
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 14:06
		Re: Name of arrays By: penteado on Tue, 21 February 2012 13:58
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 13:43
		Re: Name of arrays By: Israel Rodriguez Herm on Tue, 21 February 2012 12:36
		Re: Name of arrays By: Craig Markwardt on Tue, 21 February 2012 08:38
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 07:12
		Re: Name of arrays By: Craig Markwardt on Tue, 21 February 2012 06:49
		Re: Name of arrays By: Paul Van Delst[1] on Tue, 21 February 2012 06:50
		Re: Name of arrays By: Israel Rodriguez Herm on Tue, 21 February 2012 06:35
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 05:36
		Re: Name of arrays By: Israel Rodriguez Herm on Tue, 21 February 2012 04:45
		Re: Name of arrays By: Craig Markwardt on Mon, 20 February 2012 19:17
		Re: Name of arrays By: David Fanning on Thu, 23 February 2012 12:21
		Re: Name of arrays By: Israel Rodriguez Herm on Thu, 23 February 2012 12:17
		Re: Name of arrays By: David Fanning on Thu, 23 February 2012 11:16
		Re: Name of arrays By: Paul Van Delst[1] on Thu, 23 February 2012 10:32
		Re: Name of arrays By: Israel Rodriguez Herm on Thu, 23 February 2012 10:14
		Re: Name of arrays By: David Fanning on Thu, 23 February 2012 09:30
		Re: Name of arrays By: penteado on Thu, 23 February 2012 09:19
		Re: Name of arrays By: Israel Rodriguez Herm on Thu, 23 February 2012 09:08

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