Hi guys,
Thank you so much for the help and I really really appreciate what you
guys did for me.
I will definitely try all your suggestions plus those scripts.
Good to be here and also learn a lot by reading emails on perl
discussion.
Regards,
Changrong
On Wed, Dec 1, 2010 at 9:27 PM, Brian Fraser <[email protected]> wrote:
> On Wed, Dec 1, 2010 at 4:58 PM, Mariano Loza Coll <[email protected]>wrote:
> Alternatively, a good samaritan out there can gelp you with a one or
> two-liner code.
>
> If you only want to count letters, here's the 1-2 liner code, I guess:
>
>> #! /usr/bin/perl
>> use strict;
>> use warnings;
>> use 5.010;
>>
>> my %letter_count;
>> my %regex_count;
>> my $total;
>>
>> while (<DATA>) {
>> chomp;
>> /(.)(??{ $regex_count{$1}++; $total++ })/g; #Using a regex
>>
>> for my $letter (split //) { #Using a for loop
>> next if $letter =~ /\s/;
>> $letter_count{$letter}++;
>> }
>> }
>>
>> printf "%s\t=>\t%f\n", $_, ($regex_count{$_} / $total) * 100 for sort keys
>> %regex_count;
>>
>>
>> __DATA__
>>
>> MGSSKSKPKDPSQRRRSLEPPDSTHHGGFPASQTPNKTAAPDTHRTPSRSFGTVATEPKLFGGFNTSDTV
>> TSPQRAGALAGGVTTFVALYDYESWIETDLSFKKGERLQIVNNTEGNWWLAHSLTTGQTGYIPSNYVAPS
>> DSIQAEEWYFGKITRRESERLLLNPENPRGTFLVRESETTKGAYCLSVSDFDNAKGLNVKHYKIRKLDSG
>> GFYITSRTQFSSLQQLVAYYSKHADGLCHRLTNVCPTSKPQTQGLAKDAWEIPRESLRLEVKLGQGCFGE
>> VWMGTWNGTTRVAIKTLKPGTMSPEAFLQEAQVMKKLRHEKLVQLYAVVSEEPIYIVIEYMSKGSLLDFL
>> KGEMGKYLRLPQLVDMAAQIASGMAYVERMNYVHRDLRAANILVGENLVCKVADFGLARLIEDNEYTARQ
>> GAKFPIKWTAPEAALYGRFTIKSDVWSFGILLTELTTKGRVPYPGMGNGEVLDRVERGYRMPCPPECPES
>> LHDLMCQCWRRDPEERPTFEYLQAQLLPACVLEVAE
>>
>
> The regex solution uses the (??{CODE}) extended regular expression,
> explained in perlre[0]. The for solution uses split with an empty pattern,
> which splits on the empty string[1].
>
> [0] http://perldoc.perl.org/perlre.html#Extended-Patterns
> [1] http://perldoc.perl.org/functions/split.html
>
--
Changrong Ge, PhD student,
Center for Biomembrane Research,
Dept.of Biochemistry & Biophysics,
Svante Arrheniusväg 16,
Stockholm University, SE-10691 Stockholm, Sweden.
Tel: +46-(0)8-16 24 87, Mobile: +46-(0)76-2176 119
Fax: +46-(0)8-16 2487, Email: [email protected] or [email protected]
