#!/usr/bin/perl -w
# Copyright 2012 Kevin Ryde
# This file is part of Math-NumSeq.
#
# 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.
#
# You should have received a copy of the GNU General Public License along
# with Math-NumSeq. If not, see <http://www.gnu.org/licenses/>.
use 5.010;
use strict;
use warnings;
use Math::BigInt;
use Math::BigRat;
use Math::BigFloat;
use Math::NumSeq::Factorials;
{
# Newton e = sum 1/n!
print " ";
my $num = Math::BigInt->new(-1);
my $den = Math::BigInt->new(1);
my $n = 1;
foreach (1 .. 15) {
$num *= $n;
$den *= $n;
$num += 1;
$n++;
if ($num >= $den) {
my $digit = int ($num / $den);
$num %= $den;
print "$digit";
$num *= 10;
}
}
foreach (1 .. 30) {
$num *= $n;
$den *= $n;
$num += 1;
$n++;
$num *= 10;
my $digit = int ($num / $den);
$num %= $den;
print "$digit";
}
print "\n";
print exp(1),"\n";
exit 0;
}
{
# Newton e = sum 1/n!
my $total = Math::BigRat->new(0);
foreach my $n (1 .. 30) {
my $term = Math::BigRat->new(1)
/ Math::NumSeq::Factorials->ith($n);
print "$total\n";
print " ",$total->numify,"\n";
print " plus $term\n";
$total += $term;
}
print "$total\n";
exit 0;
}
{
# Gosper pi
my $total = Math::BigRat->new(3);
foreach my $n (1 .. 30) {
my $term = Math::BigRat->new(2)
* $n
* (5*$n+3)
* Math::NumSeq::Factorials->ith(2*$n-1)
* Math::NumSeq::Factorials->ith($n)
/ Math::NumSeq::Factorials->ith(3*$n+2)
/ Math::BigInt->new(2)**($n-1);
print "$total\n";
print " ",$total->numify,"\n";
print " plus $term\n";
$total += $term;
}
print "$total\n";
exit 0;
}