| Re: increment an array subset based on another subset [message #82405] |
Wed, 12 December 2012 07:36 |
havok2063
Messages: 24
Registered: December 2012
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Junior Member |
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On Tuesday, December 11, 2012 7:39:17 PM UTC-5, havo...@gmail.com wrote:
> I have a sorted list of ids and subsets they belong to:
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> ids = [11, 21, 45, 50, 56, 416, 430]
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> sub = [A, A, B, A, B, B, A]
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> I want to increment the ids of A based on the number of elements in subset B that lie in front of it. So for example , the 4th element will get incremented by 1 (50+1) since 1 element of B is in front. The last element will get incremented by 3 (430+3) since 3 elements of B lie in front of it. The first 2 elements of A don't get incremented.
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> I feel like the answer lies somewhere with where, total, or histogram, but the solution escapes me. Anyone have ideas?
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> Thanks.
Excellent. Thanks a lot.
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| Re: increment an array subset based on another subset [message #82416 is a reply to message #82415] |
Tue, 11 December 2012 17:51  |
Jeremy Bailin
Messages: 618
Registered: April 2008
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Senior Member |
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On 12/11/12 6:39 PM, havok2063@gmail.com wrote:
>
> I have a sorted list of ids and subsets they belong to:
>
> ids = [11, 21, 45, 50, 56, 416, 430]
>
> sub = [A, A, B, A, B, B, A]
>
> I want to increment the ids of A based on the number of elements in subset B that lie in front of it. So for example , the 4th element will get incremented by 1 (50+1) since 1 element of B is in front. The last element will get incremented by 3 (430+3) since 3 elements of B lie in front of it. The first 2 elements of A don't get incremented.
>
> I feel like the answer lies somewhere with where, total, or histogram, but the solution escapes me. Anyone have ideas?
>
> Thanks.
>
increment = total(sub eq B, /cumulative, /int) * (sub eq A)
ids += increment
-Jeremy.
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