pdl2 man page

pdl2 — Simple shell (version 2) for PDL


Use PDL interactively:

  %> pdl2
  pdl> $a = sequence(10)  # or any other perl or PDL command
  pdl> print "\$a = $a\n"; 
  $a = [0 1 2 3 4 5 6 7 8 9]


The "pdl2" program, also known as the Perldl2 shell, is a second generation version of the original "perldl" interactive PDL shell. It attempts to be backward compatible in usage while providing improved features, better support for Perl syntax, and an more easily extended framework based on the Devel::REPL shell.

If you have Devel::REPL version 1.003011 or later, then "pdl2" will start with full functionality.  If Devel::REPL is not installed or found then "pdl2" will print a warning and run the legacy "perldl" shell command instead.

By default, command lines beginning with the default prompt of either "pdl2" or "perldl" (one of 'pdl> ', 'PDL> ', or 'perldl> ') will have the prefix string and surrounding whitespace stripped.  This allows for easy cut-and-paste from sample PDL shell sessions or other examples into another PDL shell session.



Toggle print-by-default on and off (default value: off)

By default, "pdl2" does not print the results of operations since the results can be very large (e.g., a small 640x480 RGBA image is still more than 1_000_000 elements).  However, for experimenting and debugging more complex structures, it helps to see the results of every operation.  The "do_print" routine allows you to toggle between the default "quiet" operation and a full Read, Evaluate, Loop style.

  pdl> $a = pdl(3,2)
  pdl> do_print
  pdl> $a = pdl(3,2)
  $PDL1 = [3 2];
  pdl> do_print
  pdl> $a = pdl(3,2)



The maximal size pdls to print (defaults to 10000 elements). This is not just a "perldl" or "pdl2" variable but it is something that is usually needed in an interactive debugging session.

See Also

perldl, Devel::REPL


2017-02-11 perl v5.24.1 User Contributed Perl Documentation