Manual Reference Pages - CHEMISTRY::RING (3)
Chemistry::Ring - Represent a ring as a substructure of a molecule
# already have a molecule in $mol...
# create a ring with the first six atoms in $mol
my $ring = Chemistry::Ring->new;
$ring->add_atom($_) for $mol->atoms(1 .. 6);
# find the centroid
my $vector = $ring->centroid;
# find the plane that fits the ring
my ($normal, $distance) = $ring->plane;
# is the ring aromatic?
print "is aromatic!\n" if $ring->is_aromatic;
# "aromatize" a molecule
# get the rings involving an atom (after aromatizing)
my $rings = $mol->atoms(3)->attr(ring/rings);
This module provides some basic methods for representing a ring. A ring is
a subclass of molecule, because it has atoms and bonds. Besides that, it
has some useful geometric methods for finding the centroid and the ring plane,
and methods for aromaticity detection.
This module does not detect the rings by itself; for that, look at
This module is part of the PerlMol project, <http://www.perlmol.org/>.
Chemistry::Ring->new(name => value, ...)
Create a new Ring object with the specified attributes. Same as
Returs a vector with the centroid, defined as the average of the coordinates
of all the atoms in the ring. The vecotr is a Math::VectorReal object.
my ($norm, $d) = $ring->plane
Returns the normal and distance to the origin that define the plane that best
fits the atoms in the ring, by using multivariate regression. The normal
vector is a Math::VectorReal object.
Naively guess whether ring is aromatic from the molecular graph, with a method
based on Huckels rule. This method is not very accurate, but works for simple
molecules. Returns true or false.
Nothing is exported by default, but you can export these subroutines
explicitly, or all of them by using the :all tag.
Finds all the aromatic rings in the molecule and marks all the atoms and bonds
in those rings as aromatic.
It also adds the ring/rings attribute to the molecule and to all ring atoms
and bonds; this attribute is an array reference containing the list of rings
that involve that atom or bond (or all the rings in the case of the molecule).
NOTE (the ring/rings attribute is experimental and might change in future
Chemistry::Mol, Chemistry::Atom, Chemistry::Ring::Find,
Ivan Tubert-Brohman <email@example.com>
Copyright (c) 2009 Ivan Tubert-Brohman. All rights reserved. This program is
free software; you can redistribute it and/or modify it under the same terms as
|perl v5.20.3 ||CHEMISTRY::RING (3) ||2009-05-10 |
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