Amruta Purandare >
Sparse >
Sparse::Vector

Module Version: 0.03
Sparse::Vector - Implements Sparse Vector Operations

use Sparse::Vector; # creating an empty sparse vector object $spvec=Sparse::Vector->new; # sets the value at index 12 to 5 $spvec->set(12,5); # returns value at index 12 $value = $spvec->get(12); # returns the indices of non-zero values in sorted order @indices = $spvec->keys; # returns 1 if the vector is empty and has no keys if($spvec->isnull) { print "vector is null.\n"; } else { print "vector is not null.\n"; } # print sparse vector to stdout $spvec->print; # returns the string form of sparse vector # same as print except the string is returned # rather than displaying on stdout $spvec->stringify; # adds sparse vectors v1, v2 and stores # result into v1 $v1->add($v2); # adds binary equivalent of v2 to v1 $v1->binadd($v2); # binary equivalnet treats all non-zero values # as 1s # increments the value at index 12 $spvec->incr(12); # divides each vector entry by a given divisor 4 $spvec->div(4); # returns norm of the vector $spvec_norm = $spvec->norm; # normalizes a sparse vector $spvec->normalize; # returns dot product of the 2 vectors $dotprod = $v1->dot($v2); # deallocates all entries $spvec->free;

Sparse::Vector is a Perl module that implements basic vector operations on sparse vectors.

Amruta D Purandare, <pura0010@d.umn.edu>

Ted Pederse, <tpederse@d.umn.edu>

Copyright (c) 2004,

Amruta Purandare, University of Minnesota, Duluth. pura0010@umn.edu

Ted Pedersen, University of Minnesota, Duluth. tpederse@umn.edu

This program 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 2 of the License, or (at your option) any later version.

This program 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 this program; if not, write to

The Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

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