Dbg(3) User Contributed Perl Documentation Dbg(3)NAMEPDL::Dbg - functions to support debugging of PDL scripts
SYNOPSIS
use PDL;
use PDL::Dbg;
$c = $a->slice("5:10,2:30")->px->diagonal(3,4);
PDL->px;
DESCRIPTION
This packages implements a couple of functions that should come in
handy when debugging your PDL scripts. They make a lot of sense while
you're doing rapid prototyping of new PDL code, let's say inside the
perldl or pdl2 shell.
FUNCTIONS
px
Print info about a piddle (or all known piddles)
pdl> PDL->px
pdl> $b += $a->clump(2)->px('clumptest')->sumover
pdl> $a->px('%C (%A) Type: %T') # prints nothing unless $PDL::debug
pdl> $PDL::debug = 1
pdl> $a->px('%C (%A) Type: %T')
PDL (52433464) Type: Double
This function prints some information about piddles. It can be invoked
as a class method (e.g. "PDL->px" ) or as an instance method (e.g.
"$pdl->px($arg)"). If
invoked as a class method
it prints info about all piddles found in the current package
(excluding "my" variables). This comes in quite handy when you are
not quite sure which pdls you have already defined, what data they
hold , etc. "px" is supposed to support inheritance and prints info
about all symbols for which an "isa($class)" is true. An optional
string argument is interpreted as the package name for which to print
symbols:
pdl> PDL->px('PDL::Mypack')
The default package is that of the caller.
invoked as an instance method
it prints info about that particular piddle if $PDL::debug is true
and returns the pdl object upon completion. It accepts an optional
string argument that is simply prepended to the default info if it
doesn't contain a "%" character. If, however, the argument contains a
"%" then the string is passed to the "info" method to control the
format of the printed information. This can be used to achieve
customized output from "px". See the documentation of "PDL::info" for
further details.
The output of px will be determined by the default formatting string
that is passed to the "info" method (unless you pass a string
containing "%" to px when invoking as an instance method, see above).
This default string is stored in $PDL::Dbg::Infostr and the default
output format can be accordingly changed by setting this variable. If
you do this you should also change the default title string that the
class method branch prints at the top of the listing to match your new
format string. The default title is stored in the variable
$PDL::Dbg::Title.
For historical reasons "vars" is an alias for "px".
vars
Alias for "px"
BUGS
There are probably some. Please report if you find any. Bug reports
should be sent to the PDL mailing list perldl@jachw.hawaii.edu.
AUTHORCopyright(C) 1997 Christian Soeller (c.soeller@auckland.ac.nz). All
rights reserved. There is no warranty. You are allowed to redistribute
this software / documentation under certain conditions. For details,
see the file COPYING in the PDL distribution. If this file is separated
from the PDL distribution, the copyright notice should be included in
the file.
perl v5.14.1 2011-03-30 Dbg(3)