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math-image-60
River stage zero No dependents
/ App::MathImage::NumSeq::Sequence::OEIS

NAME

App::MathImage::NumSeq::Sequence::OEIS -- OEIS sequence

SYNOPSIS

 use App::MathImage;
 my $seq = App::MathImage::NumSeq::Sequence::OEIS->new
             (anum => 'A000032');
 my ($i, $value) = $seq->next;
 $value = $seq->ith(6);

DESCRIPTION

This module creates a NumSeq for a given OEIS sequence number. If there's NumSeq code implementing the sequence then that's used, otherwise downloaded OEIS files are read.

OEIS files are sought in an OEIS directory under the user's home directory. It can have a B-file, A-file or "internal" format info page.

    ~/OEIS/A000032.internal
    ~/OEIS/b000032.txt
    ~/OEIS/a000032.txt

    downloaded from:
    http://oeis.org/A000032/b000032.txt
    http://oeis.org/A000032/a000032.txt
    http://oeis.org/A000032/internal

The "internal" file is the information page presented at for instance http://oeis.org/A000032/, in a parsable format. A B-file or A-file can be used alone, but then there's no description etc.

There's only a few a000000.txt files but when available they have more values. Not every sequence has a b000000.txt file and in that case the 30 or 40 sample values from the "internal" page are used. For many sequences this is only a taste, but for fast growing sequences it may be enough.

SEE ALSO

App::MathImage::NumSeq::Sequence

HOME PAGE

http://user42.tuxfamily.org/math-image/index.html

LICENSE

Copyright 2010, 2011 Kevin Ryde

Math-Image 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-Image 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-Image. If not, see <http://www.gnu.org/licenses/>.