Re: Re: Selecting Random Sequence

Actually i need some help with both the parts. the URL is

http://www.ncbi.nlm.nih.gov/mapview/seq_reg.cgi?org=human&chr=7&from=1&to=158545518&cntg=cntg

Where the chr= changes, frm, to and cntg also change.
besides generating a random number which will span entire length of human genome is also a task! _{courtesy janitoring by ybiC: Made URL to be active link, by surrounding it with square brackets thusly [http://www...]}

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Re: Re: Re: Selecting Random Sequence by thor (Priest) on Apr 25, 2004 at 16:42 UTC
Okay...that's a start. First, let's cover the "random sequence" part. I'll make some assumptions here, as I don't really have a lot to go on. I'll assume that you have your data in a single string (I'll call it $super). So, in order to get a "random sequence", there are two elements of randomness that we have the ability to introduce: length and starting position. I'll try to incorporate both. `my $start = int(rand(length($super))); my $length = int(rand(length($super) - $start)) + 1; my $substring = substr($super, $start, $length);` [download] Of course, you could make either $start or $length static by just assigning a value to them. Now, on the the fetching part. Once you have all of the appropriate values for the variable in your URL, fetching it is not so bad: `use LWP::Simple; getstore($url, $localfile);` [download] If I can elaborate any further, let me know how and I'll do my best. thor	[reply] [d/l] [select]

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Re: Re: Re: Selecting Random Sequence
by thor (Priest) on Apr 25, 2004 at 16:42 UTC

my $start = int(rand(length($super)));
my $length = int(rand(length($super) - $start)) + 1;
my $substring = substr($super, $start, $length);
[download]

use LWP::Simple;

getstore($url, $localfile);
[download]

thor

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