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Re: HASH question [message #75455 is a reply to message #75367]

Mon, 07 March 2011 13:00

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

Hi all,

You could also use a nested hash of hashes. For example:

h = HASH('Sirius', HASH('Color': 'blue', 'Size': 'big'), 'Betelgeuse',
HASH(...), ...)

In IDL 8.1 you will be able to index into array/list/hash elements
within a Hash (or List) using simple array indexing. So in the above
case, you would be able to do:
print, h['Sirius', 'Color']
And it will print out "blue".

This also works for assignment as well.
h['Sirius', 'Color'] = 'white'

In IDL 8.0 you could do this, but you would need to use parentheses...

The only problem with using a Hash is that the keys are not predefined
like in a named structure - you could easily miss adding a field or
spell a field incorrectly.

Just a thought.

Cheers,
Chris
ITTVIS

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[Message index]

		HASH question By: Gray on Sat, 05 March 2011 05:41
		Re: HASH question By: penteado on Tue, 08 March 2011 10:15
		Re: HASH question By: pgrigis on Tue, 08 March 2011 10:12
		Re: HASH question By: penteado on Tue, 08 March 2011 07:56
		Re: HASH question By: David Fanning on Tue, 08 March 2011 07:11
		Re: HASH question By: pgrigis on Tue, 08 March 2011 07:05
		Re: HASH question By: Gray on Tue, 08 March 2011 04:23
		Re: HASH question By: chris_torrence@NOSPAM on Mon, 07 March 2011 13:38
		Re: HASH question By: penteado on Mon, 07 March 2011 13:05
		Re: HASH question By: penteado on Mon, 07 March 2011 13:02
		Re: HASH question By: chris_torrence@NOSPAM on Mon, 07 March 2011 13:00
		Re: HASH question By: pgrigis on Mon, 07 March 2011 12:32
		Re: HASH question By: Jeremy Bailin on Mon, 07 March 2011 11:15

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