1pdl2(3)               User Contributed Perl Documentation              pdl2(3)
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NAME

6       pdl2 - Simple shell (version 2) for PDL
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SYNOPSIS

9       Use PDL interactively:
10
11         %> pdl2
12
13         pdl> $x = sequence(10)  # or any other perl or PDL command
14
15         pdl> print "\$x = $x\n";
16         $x = [0 1 2 3 4 5 6 7 8 9]
17
18         pdl> with_time { print +($A->matmult($B))->info, "\n" } for 1..5;
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DESCRIPTION

21       The "pdl2" program, also known as the Perldl2 shell, is a second
22       generation version of the original "perldl" interactive PDL shell.  It
23       attempts to be backward compatible in usage while providing improved
24       features, better support for Perl syntax, and an more easily extended
25       framework based on the Devel::REPL shell.
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27       If you have Devel::REPL version 1.003011 or later, then "pdl2" will
28       start with full functionality.  If Devel::REPL is not installed or
29       found then "pdl2" will print a warning and run the legacy "perldl"
30       shell command instead.
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32       By default, command lines beginning with the default prompt of either
33       "pdl2" or "perldl" (one of 'pdl> ', 'PDL> ', or 'perldl> ') will have
34       the prefix string and surrounding whitespace stripped.  This allows for
35       easy cut-and-paste from sample PDL shell sessions or other examples
36       into another PDL shell session.
37
38       For shell-like "Ctrl-C" handling, you need Sys::SigAction installed.
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FUNCTIONS

41   do_print
42       Toggle print-by-default on and off (default value: off)
43
44       By default, "pdl2" does not print the results of operations since the
45       results can be very large (e.g., a small 640x480 RGBA image is still
46       more than 1_000_000 elements).  However, for experimenting and
47       debugging more complex structures, it helps to see the results of every
48       operation.  The "do_print" routine allows you to toggle between the
49       default "quiet" operation and a full Read, Evaluate, Loop style.
50
51         pdl> $x = pdl(3,2)
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53         pdl> do_print
54         1
55         pdl> $x = pdl(3,2)
56         $PDL1 = [3 2];
57         pdl> do_print
58
59         pdl> $x = pdl(3,2)
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VARIABLES

62       $PDL::toolongtoprint
63           The maximal size pdls to print (defaults to 10000 elements).  This
64           is not just a "perldl" or "pdl2" variable but it is something that
65           is usually needed in an interactive debugging session.
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SEE ALSO

68       perldl, Devel::REPL
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72perl v5.36.0                      2022-07-22                           pdl2(3)
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