pdl (1)

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NAME

PDL - the Perl Data Language

DESCRIPTION

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

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.

is fast, comparable and often outperforming and in real world applications. 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 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 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

shell, see perldl or pdl2.

LANGUAGE DOCUMENTATION

Most documentation describes the language features. The number of 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

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

Modules loaded by default

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::IO::Storable;
   use PDL::Lvalue;