NAME

       PDL - the Perl Data Language

DESCRIPTION

       (For the exported PDL constructor, pdl(), see PDL::Core)

       PDL is the Perl Data Language, a perl extension that is designed for scientific and bulk
       numeric data processing and display.  It extends perl's syntax and includes fully
       vectorized, multidimensional array handling, plus several paths for device-independent
       graphics output.

       PDL is fast, comparable and often outperforming IDL and MATLAB in real world applications.
       PDL allows large N-dimensional data sets such as large images, spectra, etc to be stored
       efficiently and manipulated quickly.

VECTORIZATION

       For a description of the vectorization (also called "threading"), see PDL::Core.

INTERACTIVE SHELL

       The PDL package includes an interactive shell. You can learn about it, run "perldoc
       perldl", or run the shell "perldl" or "pdl2" and type "help".

LOOKING FOR A FUNCTION?

       If you want to search for a function name, you should use the PDL shell along with the
       "help" or "apropos" command (to do a fuzzy search).  For example:

        pdl> apropos xval
        xlinvals        X axis values between endpoints (see xvals).
        xlogvals        X axis values logarithmicly spaced...
        xvals           Fills a piddle with X index values...
        yvals           Fills a piddle with Y index values. See the CAVEAT for xvals.
        zvals           Fills a piddle with Z index values. See the CAVEAT for xvals.

       To learn more about the PDL shell, see perldl or pdl2.

LANGUAGE DOCUMENTATION

       Most PDL documentation describes the language features. The number of PDL pages is too
       great to list here. The following pages offer some guidance to help you find the
       documentation you need.

       PDL::FAQ
            Frequently asked questions about PDL. This page covers a lot of questions that do not
            fall neatly into any of the documentation categories.

       PDL::Tutorials
            A guide to PDL's tutorial-style documentation. With topics from beginner to advanced,
            these pages teach you various aspects of PDL step by step.

       PDL::Modules
            A guide to PDL's module reference. Modules are organized by level (foundation to
            advanced) and by category (graphics, numerical methods, etc) to help you find the
            module you need as quickly as possible.

       PDL::Course
            This page compiles PDL's tutorial and reference pages into a comprehensive course
            that takes you from a complete beginner level to expert.

       PDL::Index
            List of all available documentation, sorted alphabetically. If you cannot find what
            you are looking for, try here.

MODULES

       PDL includes about a dozen perl modules that form the core of the language, plus
       additional modules that add further functionality.  The perl module "PDL" loads all of the
       core modules automatically, making their functions available in the current perl
       namespace.  Some notes:

       SYNOPSIS
            See the SYNOPSIS section at the end of this document for a list of modules loaded by
            default.

       PDL::Lite and PDL::LiteF
            These are lighter-weight alternatives to the standard PDL module.  Consider using
            these modules if startup time becomes an issue.

       Exports
            "use PDL;" exports a large number of routines into the calling namespace.  If you
            want to avoid namespace pollution, you must instead "use PDL::Lite", and include any
            additional modules explicitly.

       PDL::NiceSlice
            Note that the PDL::NiceSlice syntax is NOT automatically loaded by "use PDL;".  If
            you want to use the extended slicing syntax in a standalone script, you must also say
            "use PDL::NiceSlice;".

       PDL::Math
            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 PDL::Lite and PDL::LiteF
            start-up modules.

SYNOPSIS

        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::MatrixOps;
          use PDL::Math;
          use PDL::Version;
          use PDL::IO::Misc;
          use PDL::IO::FITS;
          use PDL::IO::Pic;
          use PDL::Lvalue;