DragonFly On-Line Manual Pages
TUTORIALS(1) User Contributed Perl Documentation TUTORIALS(1)
PDL::Tutorials - A guide to PDL's tutorial documentation.
These are our migration guides for users familiar with other types of
numerical analysis software.
Migration guide for MATLAB users. This page explains the key
differences between MATLAB and PDL from the point of view of a
Migration guide for Scilab users. This page explains the key
differences between Scilab and PDL from the point of view of a
Why did we write PDL? This document explains some of the history
and motivation behind the Perl Data Language. It is an attempt to
answer the question "Why PDL?".
Quick introduction to PDL features. A hands-on guide suitable for
complete beginners. This page assumes no previous knowledge of
Perl or PDL.
After you have read the QuickStart guide, you should follow up
with this document. This guide goes more deeply into the concepts
of "indexing" and "slicing" and how they form the core of
numerical analysis with PDL.
Threading is one of PDL's most powerful features. If you know
MATLAB, you've heard of "vectorizing". Well, threading is like
"vectorizing on steroids". It lets you make very fast and compact
code by avoiding nested loops. All vector-based languages do this,
but PDL generalizes the technique to all sorts of applications.
This tutorial introduces PDL's threading feature, and it shows an
example implementing Conway's Game of Life in 10 lines and 80
times faster than a classical implementation.
Sometimes it is useful to specify that a certain value is "bad" or
"missing". Scientific instruments some times include portions of
invalid data. For example, a CCD camera might produce an image
with over-exposed pixels. PDL's "bad values" feature gives you an
easy way to deal with this sort of imperfect data.
Tips and suggestions for using PDL. This page is an assorted
collection of programming tidbits that some PDL users have found
useful. Some of these tips might be of help when you write your
PDL's Pre-Processor is one of PDL's most powerful features. You
write a function definition in special markup and the preprocessor
generates real C code which can be compiled. With PDL:PP you get
the full speed of native C code without having to deal with the
full complexity of the C language.
A simple cookbook explaining how to create piddle manually, either
from Perl or from C/XS code. This page covers the PDL core
routines that comprise the PDL API. If you need to access piddles
from C/XS, this is the document for you.
Description of the inner workings of the PDL module. Very few
people need to see this. This page is mainly for PDL developers,
or people interested in debugging PDL or changing the internals of
PDL. If you can read this document and understand all of it, and
you additionally understand PDL::PP, you will be awarded the title
of "PDL Guru".
Copyright 2010 Daniel Carrera (email@example.com). You can distribute
and/or modify this document under the same terms as the current Perl
perl v5.20.2 2015-05-24 TUTORIALS(1)