From: George George <george.githinji@...>
Date: 2009-04-08T21:02:04+09:00
Subject: what is happening here

i have some perl code

while ($high - $low > 0.001) {    # precision
    # calculate the sum of all normalized scores
    my $sum = Pn * Pn * exp($lambda * $match)    * 4
            + Pn * Pn * exp($lambda * $mismatch) * 12;
    # refine guess at lambda
    if ($sum > 1) {
        $high = $lambda;
        $lambda = ($lambda + $low)/2;
    }
    else {
        $low = $lambda;
        $lambda = ($lambda + $high)/2;
    }
}


trying to rewrite this in ruby
while (high - low > 0.001)
  #calculate the sum of all normalized scores
  sum = Pn * Pn **(lambda * match) * 4 + Pn * Pn **(lambda * mismatch) *
12

  #refine guess at lambda
  if sum > 1
    high = lambda
    lambda = (lambda  + low)/2
  else
    low = lambda
    lambda = (lambda+high)/2
  end
end

Is this the right way?

i seem to get different results when i execute the ruby version.
any ideas?
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