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Re: Name of arrays [message #79324 is a reply to message #79269]

Tue, 21 February 2012 13:43

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Israel Rodriguez Hermelo writes:

> I've been trying to work with structures and pointers for a while but
> I found them confusing. I can not stop thinking about the solution of
> my problem with IDL v8.
>
> If I understand right, these few lines would resolve my problems:
>
> MONTH=['MARCH','JULY']
>
> DAY=HASH()
> TEMPERATURE=HASH()
>
> Nmonth=N_ELEMENTS(MONTH)
>
> for i=0, Nmonth-1 do begin
>
> readcol, 'DATA_'+MONTH(i)+'.txt', D, T
>
> DAY[MONTH(i)]=D
> TEMPERATURE[MONTH(i)]=T
>
> endfor
>
> plot, DAY[MONTH(0)], TEMPERATURE[MONTH(0)]
> oplot, DAY[MONTH(1)], TEMPERATURE[MONTH(1)]
>
>
> Would this code work? If the answer is yes, then I need to talk with
> my boss about IDL v8 ;)

A hash is nothing more than an fancy interface for
pointers. If you want to use one in your version of
IDL, you can use Craig's:

http://cow.physics.wisc.edu/~craigm/idl/arrays.html

But, I don't know how you would ever understand what
a hash was without knowing at least *something* about
pointers.

Craig's structure was a form of a hash, where the "key"
is really the structure tag.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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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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