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Re: Vector comparison. [message #37063 is a reply to message #37062]

Thu, 20 November 2003 04:02

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

Craig Markwardt wrote:
> Reimar Bauer <R.Bauer@fz-juelich.de> writes:
>
>>> Alas, Reimar, none of these gives the answer of [2,3,4,6]
>>> that Mr. Hunter was looking for. :-)
>>>
>>> Cheers,
>>>
>>> David
>>>
>>> P.S. I know we are all busy, but maybe we should make
>>> it a new rule that we all have to take a deep breath and
>>> a stretch, then read the question TWICE before
>>> posting an answer. :-)
>>>
>>
>> Oh, yes you are right, I missed to post the right thing. As I started
>> writing I thought I give a complete answer to all related topics.
>>
>>
>>
>> IDL> A=[0,1,3,3,3,6,7,9,9]
>> IDL> B=[3,7]
>> IDL> print,which_indices(a,b)
>
>
> OK, now it's my turn to be nit-picky. The WHICH_INDICES routine uses
> a brute force loop approach which was what the original poster was
> trying to avoid.
>

Dear Craig,

I have learned a new word. "nit-picky"

Yes this was not the best answer to the originally request. But he also
does not show a working routine. I believe it is better to show some
code as you did too. I did the postings because it is later easier to
find the complete knowledge by the google search in one thread.

I will try your method and will watch if some other experts could show a
different solution.
The best result is very important for our group too.

P.S. If we have all read it as carefully as mentioned what would we have
answered. Pavel will uses loops as well, we boths have not read
carefully enough, David hasn't replied.

Reimar

> I think that getting *all* matches without loops is a rather difficult
> problem. The approach that I recommended separately involves a "fast"
> intersection and then a "slow" rebuilding of a duplicates list. That
> falls over too if the intersection result is large, but it should
> always be about as fast as the brute force approach.
>
> Craig
>

--
Reimar Bauer

Institut fuer Stratosphaerische Chemie (ICG-I)
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
------------------------------------------------------------ -------
a IDL library at ForschungsZentrum Juelich
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_lib_intro. html
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[Message index]

		Re: Vector comparison. By: JD Smith on Thu, 20 November 2003 11:38
		Re: Vector comparison. By: tam on Thu, 20 November 2003 10:55
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 09:55
		Re: Vector comparison. By: Craig Markwardt on Thu, 20 November 2003 09:35
		Re: Vector comparison. By: tam on Thu, 20 November 2003 09:24
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 08:52
		Re: Vector comparison. By: Chris[1] on Thu, 20 November 2003 08:08
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 08:08
		Re: Vector comparison. By: R.Bauer on Thu, 20 November 2003 07:11
		Re: Vector comparison. By: tam on Thu, 20 November 2003 07:03
		Re: Vector comparison. By: hunter on Thu, 20 November 2003 06:49
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 05:40
		Re: Vector comparison. By: R.Bauer on Thu, 20 November 2003 04:02
		Re: Vector comparison. By: Craig Markwardt on Thu, 20 November 2003 02:19
		Re: Vector comparison. By: Chris Lee on Thu, 20 November 2003 02:09
		Re: Vector comparison. By: R.Bauer on Thu, 20 November 2003 01:01
		Re: Vector comparison. By: Craig Markwardt on Thu, 20 November 2003 00:23
		Re: Vector comparison. By: David Fanning on Wed, 19 November 2003 18:05
		Re: Vector comparison. By: R.Bauer on Wed, 19 November 2003 17:50
		Re: Vector comparison. By: Craig Markwardt on Wed, 19 November 2003 15:48
		Re: Vector comparison. By: Pavel Romashkin on Wed, 19 November 2003 16:09

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