On Fri, 2009-01-16 at 18:02 +0900, Gundala Viswanath wrote:
> Dear all,
>
> I have a repository file (let's call it repo.txt)
> that contain two columns like this:
>
> # tag value
> AAA 0.2
> AAT 0.3
> AAC 0.02
> AAG 0.02
> ATA 0.3
> ATT 0.7
>
> Given another query vector
>
> > qr <- c("AAC", "ATT")
>
> I would like to find the corresponding value for each query above,
> yielding:
>
> 0.02
> 0.7
>
> However, I want to avoid slurping whole repo.txt into an object (e.g. hash).
> Is there any ways to do that?
>
> The reason I want to do that because repo.txt is very2 large size
> (milions of lines,
> with tag length > 30 bp), and my PC memory is too small to keep it.
>
> - Gundala Viswanath
> Jakarta - Indonesia
Hello,
You can always store your repo.txt into a database, say, SQLite, and
select only the values you want via an SQL query.
Thus, you will prevent loading the full file into memory.
Best regards,
Carlos J. Gil Bellosta
http://www.datanalytics.com
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