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.\" ========================================================================
.\"
.IX Title "DELTA 1p"
.TH DELTA 1p "2022-01-30" "perl v5.32.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
PDL::Delta \- PDL changes between V1.0 and V2.0
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This file is an attempt to list the major user-visible changes
between \s-1PDL\s0 versions 1.0 and 2.0.
.SH "Core Changes"
.IX Header "Core Changes"
.SS "ndarrays are not hashes any more:"
.IX Subsection "ndarrays are not hashes any more:"
.Vb 2
\&    $x = zeroes 10,10;
\&    $$x{FOO} = "bar"
.Ve
.PP
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
.PP
.Vb 1
\&    $x\->hdr()
.Ve
.PP
which returns a reference to an anonymous hash. Also,
subclassing works if you store an ndarray in the hash member ``\s-1PDL\s0''.
.PP
There are also many core enhancements to support Dataflow and
Slicing tricks, but these do not introduce any incompatibilities.
.SS "Incompatible Changes vs 1.11"
.IX Subsection "Incompatible Changes vs 1.11"
.IP "rgrep" 4
.IX Item "rgrep"
Order of the arguments has changed.
.IP "copy method" 4
.IX Item "copy method"
No longer copies the header. This may not be a misfeature.
.SH "Documentation Changes"
.IX Header "Documentation Changes"
Many of the base and library pods were updated.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
The \fIChanges\fR file for exhaustive details on what changed.
.PP
The \fI\s-1INSTALL\s0\fR file for how to build \s-1PDL.\s0
.PP
The \fI\s-1README\s0\fR file for general stuff.
.SH "HISTORY"
.IX Header "HISTORY"
pdldelta was inspired by \fIperldelta\fR  man page in the Perl
5.004 distribution.