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How can I count the number and kinds of letters at 1st, 2nd and 3rd positions of 3-letter words in a string?

by supriyoch_2008 (Monk)
on Apr 25, 2012 at 15:00 UTC ( #967084=perlquestion: print w/replies, xml ) Need Help??

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  1. or download this
    #!usr/bin/perl-w
    $a="ATCGGCGCCTAT";
    code??
    ...
     Letters at 3rd position:\n
      A3=$A3; T3=$T3; G3=$G3; C3=$C3; \n";
    exit;
    
  2. or download this
    The result of counting from the string should look like:
     Letters at 1st position:
       A1=1; T1=1; G1=2; C1=0; 
    ...
       A2=1; T2=1; G2=1; C2=1; 
     Letters at 3rd position:
       A3=0; T3=1; G3=0; C3=3; 
    

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