/usr/share/doc/libmath-symbolic-perl/examples/run04.pl is in libmath-symbolic-perl 0.612-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | #!/usr/bin/perl
use strict;
use warnings;
use lib '../lib';
use Math::Symbolic qw/:all/;
use Benchmark;
my $var = Math::Symbolic::Variable->new();
my $a = $var->new( 'a' => 2 );
my $c = Math::Symbolic::Constant->new();
my $e = $c->euler();
my $two = $c->new(2);
print "Vars: a=" . $a->value() . " (Values are optional)\n\n";
my $op = Math::Symbolic::Operator->new();
my $mul1 = $op->new( '*', $two, $a );
my $exp1 = $op->new( '^', $e, $mul1 );
print "prefix notation and evaluation:\n";
print $exp1->to_string('prefix') . " = " . $exp1->value() . "\n\n";
print "Now, we derive this partially to a (20 times): (infix)\n";
use Time::HiRes qw/time/;
my $n_tree = $op->new(
{
type => U_P_DERIVATIVE,
operands => [ $exp1, $a ],
}
);
foreach ( 1 .. 100 ) {
print "$_\n";
$n_tree = $op->new(
{
type => U_P_DERIVATIVE,
operands => [ $n_tree, $a ],
}
);
$n_tree = $n_tree->apply_derivatives();
$n_tree = $n_tree->simplify();
}
print $n_tree->to_string('infix') . " = " . $n_tree->value() . "\n\n";
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