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=head1 NAME
PDL::Delta - PDL changes between V1.0 and V2.0
=head1 DESCRIPTION
This file is an attempt to list the major user-visible changes
between PDL versions 1.0 and 2.0.
=head1 Core Changes
=head2 Piddles are not hashes any more:
$a = zeroes 10,10;
$$a{FOO} = "bar"
doesn't work. They are currently scalar references (to opaque
C structures in finer terms) because of speed as well as
syntactic issues. If you want to have a hash, use
$a->hdr()
which returns a reference to an anonymous hash. Also,
subclassing works if you store a piddle in the hash member ``PDL''.
There are also many core enhancements to support Dataflow and
Slicing tricks, but these do not introduce any incompatibilities.
=head2 Incompatible Changes vs 1.11
=over 4
=item rgrep
Order of the arguments has changed.
=item copy method
No longer copies the header. This may not be a misfeature.
=back
=head1 Documentation Changes
Many of the base and library pods were updated.
=head1 SEE ALSO
The F<Changes> file for exhaustive details on what changed.
The F<INSTALL> file for how to build PDL.
The F<README> file for general stuff.
=head1 HISTORY
pdldelta was inspired by I<perldelta> man page in the Perl
5.004 distribution.
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