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RedHat 9 (Linux i386) - man page for pdl (redhat section 3)

PDL(3)							User Contributed Perl Documentation						    PDL(3)

PDL - Main loader of PDL default modules
Loads the default set of modules associated with PDL, making the functions available in the current namespace. See also PDL::Lite or PDL::LiteF if start-up time becomes an issue. The PDL::Math module has been added to the list of modules for versions later than 2.3.1. Note that PDL::Math is still not included in the Lite and LiteF start-up modules. If you are looking for general documentation on PDL the PDL::Index manpage is a good starting point.
use PDL; # Is equivalent to the following: use PDL::Core; use PDL::Ops; use PDL::Primitive; use PDL::Ufunc; use PDL::Basic; use PDL::Slices; use PDL::Bad; use PDL::Math; use PDL::Version; use PDL::IO::Misc; use PDL::Lvalue; perl v5.8.0 2002-09-11 PDL(3)