From: Logan Capaldo <logancapaldo@...>
Date: 2007-07-19T19:35:54+09:00
Subject: Re: identify and extract positions from a string - how to?

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On 7/19/07, Marc Hoeppner <marc.hoeppner@molbio.su.se> wrote:
>
> Hi,
>
> I am not quite sure about how to approach the following problem:
>
> I have a long (long long long) string of letters, a genomic sequence
> (600k characters+).
> Now, what I want to do is to extract certain parts of this string, based
> on the position.
> So for example lets say I want all characters from position 2340 to
> 5436.
>
> A quick pointer in the right direction would be much appreciated. I have
> a vague idea that it could perhaps be done with count? Like "puts string
> where string.count("actg")=2340 until string.count("actg")=5436"... ?
> Not sure tho, and probably there are better ways.


string[2340..5436]

Cheers,
>
> Marc
>
> --
> Posted via http://www.ruby-forum.com/.
>
>

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