Math::NumSeq::SqrtContinued -- continued fraction expansion of a square root
use Math::NumSeq::SqrtContinued; my $seq = Math::NumSeq::SqrtContinued->new (sqrt => 2); my ($i, $value) = $seq->next;
This is terms in the continued fraction expansion of a square root. It approaches the root by
1 sqrt(S) = a + ----------- a + 1 ----------- a + 1 ---------- a + ...
The first term a is the integer part of the root, leaving a remainder 0 < r < 1 which is expressed as r=1/R with R > 1
1 sqrt(S) = a + --- R
Then a is the integer part of that R, and so on recursively.
Values a onwards are always a fixed-period repeating sequence. For example sqrt(14) is a=3 and then 1,2,1,6 repeating. For some roots a single value repeats. For example sqrt(2) is a=1 then 2 repeating. See SqrtContinuedPeriod for just the length of the period.
See "FUNCTIONS" in Math::NumSeq for behaviour common to all sequence classes.
$seq = Math::NumSeq::SqrtContinued->new (sqrt => $s)
Create and return a new sequence object giving the Continued expansion terms of
$value = $seq->ith ($i)
Return the i'th term in the continued fraction, starting from i=0 for the integer part of the sqrt.
$i = $seq->i_start ()
Return 0, the first term in the sequence being i=0.
Copyright 2011, 2012, 2013 Kevin Ryde
Math-NumSeq is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.
Math-NumSeq is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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