man PDL::Delta (1): PDL changes between V1.0 and V2.0

DESCRIPTION

This file is an attempt to list the major user-visible changes between PDL versions 1.0 and 2.0.

Core Changes

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.

Incompatible Changes vs 1.11

rgrep: Order of the arguments has changed.
copy method: No longer copies the header. This may not be a misfeature.

Documentation Changes

Many of the base and library pods were updated.

HISTORY