PDL::Threading – Tutorial for PDL’s Threading feature IntroductionOne of the most powerful features of PDL is threading, which can produce very compact and very fast PDL code by avoiding multiple nested for loops that C and BASIC users may be familiar with. The trouble is that it can take some getting used to, and new…
PDL::Scilab – A guide for Scilab users. IntroductionIf you are a Scilab user, this page is for you. It explains the key differences between Scilab and PDL to help you get going as quickly as possible. This document is not a tutorial. For that, go to PDL::QuickStart. This document complements the Quick Start guide, as…
PDL::QuickStart – Quick introduction to PDL features. SynopsisA brief summary of the main PDL features and how to use them. DescriptionIntroductionPerl is an extremely good and versatile scripting language, well suited to beginners and allows rapid prototyping. However until recently it did not support data structures which allowed it to do fast number crunching. However…
PDL::Philosophy — Why did we write PDL? DescriptionSome history from the creator of PDL, leading into the philosophy and motivation behind this data language. This is an attempt to summarize some of the common spirit between pdl developers in order to answer the question “Why PDL”? The Start of PDL“Why is it that we entertain…
PDL::ParallelCPU – Parallel Processor MultiThreading Support in PDL (Experimental) DescriptionPDL has support (currently experimental) for splitting up numerical processing between multiple parallel processor threads (or pthreads) using the set_autopthread_targ and set_autopthread_size functions. This can improve processing performance (by greater than 2-4X in most cases) by taking advantage of multi-core and/or multi-processor machines. Synopsis use PDL;…
PDL::PP – Generate PDL routines from concise descriptions Synopsise.g. pp_def( ‘sumover’, Pars => ‘a(n); [o]b();’, Code => q{ double tmp=0; loop(n) %{ tmp += $a(); %} $b() = tmp; }, ); pp_done();FunctionsHere is a quick reference list of the functions provided by PDL::PP. pp_add_bootAdd code to the BOOT section of generated XS file pp_add_exportedAdd functions…
Inline::Pdlpp – Write PDL Subroutines inline with PDL::PPDescription"Inline::Pdlpp" is a module that allows you to write PDL subroutines in the PDL::PP style. The big benefit compared to plain "PDL::PP" is that you can write these definitions inline in any old perl script (without the normal hassle of creating Makefiles, building, etc). Since version 0.30 the…
PDL::Objects — Object-Orientation, what is it and how to exploit it DescriptionThis still needs to be written properly. [Also, is there a good reason we don’t recommend storing extra object data in the header hash?] InheritanceThere are basically two reasons for subclassing piddles. The first is simply that you want to be able to use…
PDL::Modules – A guide to PDL’s module reference. DescriptionThis page serves as a table of contents for PDL‘s module documentation. This page does not list every single PDL module. It only shows the ones intended for PDL users, while ommitting those which are deemed “for internal use only”. If you wish to see a comprehensive…
PDL::MATLAB – A guide for MATLAB users. IntroductionIf you are a MATLAB user, this page is for you. It explains the key differences between MATLAB and PDL to help you get going as quickly as possible. This document is not a tutorial. For that, go to PDL::QuickStart. This document complements the Quick Start guide, as…
PDL::Internals – description of some aspects of the current internals DescriptionIntroThis document explains various aspects of the current implementation of PDL. If you just want to use PDL for something, you definitely do not need to read this. Even if you want to interface your C routines to PDL or create new PDL::PP functions, you…
PDL::Indexing – Introduction to indexing and slicing piddles. OverviewThis man page should serve as a first tutorial on the indexing and threading features of PDL. Like all vectorized languages, PDL automates looping over arrays using a variant of mathematical vector notation. The automatic looping is called “threading”, in part because ultimately PDL will implement parallel…
PDL::FAQ – Frequently asked questions about PDL VersionCurrent FAQ version: 1.004 DescriptionThis is version 1.004 of the PDL FAQ, a collection of frequently asked questions about PDL – the Perl Data Language. About This DocumentQ: 1.1 Where to find this documentYou can find the latest version of this document at <http://pdl.perl.org/?docs=FAQ&title=Frequently%20Asked%20Questions> . Q: 1.2 How…
PDL::Delta – PDL changes between V1.0 and V2.0 DescriptionThis file is an attempt to list the major user-visible changes between PDL versions 1.0 and 2.0. Core ChangesPiddles are not hashes any more: $a = zeroes 10,10; $$a{FOO} = "bar"doesn’t work. They are currently scalar references (to opaque C structures in finer terms) because of speed…
PDL::Dataflow — description of the dataflow philosophy Synopsis pdl> $a = zeroes(10); pdl> $b = $a->slice("2:4:2"); pdl> $b ++; pdl> print $a; [0 0 1 0 1 0 0 0 0 0]WarningDataflow is very experimental. Many features of it are disabled for 2.0, particularly families for one-directional dataflow. If you wish to use one-directional dataflow…
PDL::Course – A journey through PDL’s documentation, from beginner to advanced. Author, DateThis is written by David Mertens with edits by Daniel Carrera. PrefacePDL‘s documentation is extensive. Some sections cover deep core magic while others cover more usual topics like IO and numerical computation. How are these related? Where should you begin? This document is…
PDL::Bugs – How to diagnose and report PDL problems Versionversion 1.0000 DescriptionThis module explains how to get help with a PDL problem and how, when, and where to submit a bug report. In the future it may be extended to provide some sort of automated bug reporting capability. If You Have A Pdl ProblemThe primary…
PDL::BadValues – Discussion of bad value support in PDL DescriptionWhat are bad values and why should I bother with them?Sometimes it’s useful to be able to specify a certain value is ‘bad’ or ‘missing’; for example CCDs used in astronomy produce 2D images which are not perfect since certain areas contain invalid data due to…
PDL::API – making piddles from Perl and C/XS code DescriptionA simple cookbook how to create piddles manually. It covers both the Perl and the C/XS level. Additionally, it describes the PDL core routines that can be accessed from other modules. These routines basically define the PDL API. If you need to access piddles from C/XS…
PCPIntro – introduction to the Performance Co-Pilot (PCP) IntroductionThe Performance Co-Pilot (PCP) is a toolkit designed for monitoring and managing system-level performance. These services are distributed and scalable to accommodate the most complex system configurations and performance problems. PCP supports many different platforms, including (but not limited to) Linux, MacOSX, Solaris and Windows. From a…