[R] Fast way to finding index in Vector

[Gundala Viswanath]

Hi Jorge and all,

How can I modified your code when

query size can be bigger than repository,
meaning that it can contain repeats.

e.g. qr <- c("AAC", "ATT", "ATT","AAC", "ATT", "ATT", "AAT", "ATT", "ATT",  )


Sorry, I should have mentioned this earlier.


- Gundala Viswanath
Jakarta - Indonesia



On Tue, Jan 13, 2009 at 11:11 AM, Jorge Ivan Velez
<jorgeivanvelez at gmail.com> wrote:
>
> Perhaps
> which(repo%in%qr)
> ?
> HTH,
>
> Jorge
>
>
> On Mon, Jan 12, 2009 at 9:07 PM, Gundala Viswanath <gundalav at gmail.com>
> wrote:
>>
>> Dear all,
>>
>> Suppose I have the following vector as repository:
>>
>> > repo <- c("AAA", "AAT", "AAC", "AAG", "ATA","ATT")
>>
>> Given another query vector
>>
>> > qr <- c("AAC", "ATT")
>>
>> is there a way I can find the query index in repository in a fast way.
>>
>> Giving:
>>
>> [1] 3 6
>>
>> Typically the size of  repo is around ~12million element, and
>> query around ~1 million element.
>>
>>
>> - Gundala Viswanath
>> Jakarta - Indonesia
>>
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>
>