PDL::CCS - Sparse N-dimensional PDLs with compressed column
storage
use PDL;
use PDL::CCS;
## ... stuff happens ...
PDL::CCS is now just a wrapper package which pulls in a number of
submodules. See the documentation of the respective modules for details.
- PDL::CCS::Nd
- Perl class for representing large sparse N-dimensional numeric structures
using sorted index vector-vectors and a flat vector of non-missing values.
Supports a subset of the perl-side PDL API.
- PDL::CCS::Compat
- Backwards-compatibility module for Harwell-Boeing compressed row- or
column-storage.
- PDL::CCS::Functions
- Some useful generic pure-perl functions for dealing directly with CCS-,
CRS-, and index-encoded PDLs.
- PDL::CCS::Utils
- Low-level generic PDL::PP utilities for Harwell-Boeing encoding and
decoding "pointers" along arbitrary dimensions of a sparse PDL
given an index list.
- PDL::CCS::Ops
- Low-level generic PDL::PP utilities for blockwise alignment of pairs of
sparse index-encoded PDLs, useful for implementing binary operations.
- PDL::CCS::Ufunc
- Various low-level ufunc (accumulator) utilities for index-encoded
PDLs.
- PDL::CCS::MatrixOps
- Low-level generic PDL::PP utilities for matrix operations on index-encoded
PDLs.
- PDL::CCS::IO::FastRaw
- PDL::IO::FastRaw wrappers for PDL::CCS::Nd objects.
Perl by Larry Wall.
PDL by Karl Glazebrook, Tuomas J. Lukka, Christian Soeller, and
others.
Original inspiration and algorithms from the SVDLIBC C library by
Douglas Rohde; which is itself based on SVDPACKC by Michael Berry, Theresa
Do, Gavin O'Brien, Vijay Krishna and Sowmini Varadhan.
- PDL::CCS::Nd supports only a subset of the PDL API (i.e. is not really a
PDL).
- Binary operations via alignment only work correctly when missing values
are annihilators.
- Misleading module name: PDL::CCS::Nd objects actually use a native COO
(full coordinate list) format rather than CRS (compressed row storage) or
CCS (compressed column storage); see
<https://en.wikipedia.org/wiki/Sparse_matrix#Coordinate_list_(COO)>
for a discussion.
Bryan Jurish <moocow@cpan.org>
Copyright (C) 2005-2024 by Bryan Jurish. All rights reserved.
This package is free software, and entirely without warranty. You
may redistribute it and/or modify it under the same terms as Perl
itself.
perl(1), PDL(3perl), PDL::CCS::Nd(3perl),
PDL::SVDLIBC(3perl),
<https://en.wikipedia.org/wiki/Sparse_matrix>.