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Re: Matching 2 lists [message #72219 is a reply to message #72218]

Sat, 21 August 2010 09:52

penteado
Messages: 866
Registered: February 2018

Senior Member
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On Aug 21, 1:37 pm, David Baker <de...@le.ac.uk> wrote:
>>> If you're using IDL 8.0, you could modify match_2d to return a list of
>>> length n_a, where each element is an array of indices into b.
>
>> Thanks for the advice, whilst I maybe comfortable programming basic
>> stuff I can't even begin to follow the match_2d code so wouldn't know
>> where exactly to code in what you suggest. But that is exactly what
>> I'm after.
>
>> -Cheers,
>> David
>
> You mentioned using IDL 8.0. My university is currently still on
> 7.1.1, is there anything unique about IDL 8.0 to the solution you
> propose?

Lists and empty arrays. In that case, because each element of A can
have a different number of matches, so each element of the list is an
array of a different size (possibly empty, if there are no matches).

The most direct way to do something similar in IDL 7 is a pointer
array, where each element points to the array of indices that match
the corresponding element of A. Which is more awkward to use due to
the need to dereference the pointer, and the need to test (with null
pointers, for instance) for the no-match case.

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[Message index]

		Re: Matching 2 lists By: David Baker on Sun, 22 August 2010 00:06
		Re: Matching 2 lists By: Jeremy Bailin on Sat, 21 August 2010 12:48
		Re: Matching 2 lists By: David Baker on Sat, 21 August 2010 10:03
		Re: Matching 2 lists By: penteado on Sat, 21 August 2010 09:52
		Re: Matching 2 lists By: David Baker on Sat, 21 August 2010 09:37
		Re: Matching 2 lists By: David Baker on Sat, 21 August 2010 08:35
		Re: Matching 2 lists By: Gray on Sat, 21 August 2010 08:28
		Re: Matching 2 lists By: David Baker on Sat, 21 August 2010 08:16
		Re: Matching 2 lists By: Jeremy Bailin on Thu, 26 August 2010 07:10

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