pdl::graphics::trid::mathgraph(3pm) [debian man page]

TriD::MathGraph(3pm)					User Contributed Perl Documentation				      TriD::MathGraph(3pm)

NAME

       PDL::Graphics::TriD::MathGraph -- Mathematical Graph objects for PDL

SYNOPSIS

       see the file Demos/TriD/tmathgraph.p in the PDL distribution.

WARNING

       This module is experimental and the interface will probably change.

DESCRIPTION

       This module exists for plotting mathematical graphs (consisting of nodes and arcs between them) in 3D and optimizing the placement of the
       nodes so that the graph is visualizable in a clear way.

AUTHOR

       Copyright (C) 1997 Tuomas J. Lukka (lukka@husc.harvard.edu).

       All rights reserved. There is no warranty. You are allowed to redistribute this software / documentation under certain conditions. For
       details, see the file COPYING in the PDL distribution. If this file is separated from the PDL distribution, the copyright notice should be
       included in the file.

perl v5.14.2							    2011-03-30						      TriD::MathGraph(3pm)

TriD::Contours(3pm)					User Contributed Perl Documentation				       TriD::Contours(3pm)

NAME

	 PDL::Graphics::TriD::Contours - 3D Surface contours for TriD

SYNOPSIS

	   # A simple contour plot in black and white

	   use PDL::Graphics::TriD;
	   use PDL::Graphics::TriD::Contours;
	   $size = 25;
	   $x = (xvals zeroes $size,$size) / $size;
	   $y = (yvals zeroes $size,$size) / $size;
	   $z = (sin($x*6.3) * sin($y*6.3)) ** 3;
	   $data=new PDL::Graphics::TriD::Contours($z,
		      [$z->xvals/$size,$z->yvals/$size,0]);
	   PDL::Graphics::TriD::graph_object($data)

FUNCTIONS

   new()
       Define a new contour plot for TriD.

	 $data=new PDL::Graphics::TriD::Contours($d,[$x,$y,$z],[$r,$g,$b],$options);

       where $d is a 2D pdl of data to be contoured. [$x,$y,$z] define a 3D map of $d into the visualization space [$r,$g,$b] is an optional [3,1]
       piddle specifing the contour color and $options is a hash reference to a list of options documented below.  Contours can also be colored by
       value using the set_color_table function.

	 ContourInt  => 0.7  # explicitly set a contour interval
	 ContourMin  => 0.0  # explicitly set a contour minimum
	 ContourMax  => 10.0 # explicitly set a contour maximum
	 ContourVals => $pdl # explicitly set all contour values
	 Label => [1,5,$myfont] # see addlabels below
	 Font =>  $font      # explicitly set the font for contour labels

	 If ContourVals is specified ContourInt, ContourMin, and ContourMax
	 are ignored.  If no options are specified, the algorthym tries to
	 choose values based on the data supplied.  Font can also be specified or
	 overwritten by the addlabels() function below.

   addlabels()
       Add labels to a contour plot

	 $contour->addlabels($labelint,$segint,$font);

       $labelint is the integer interval between labeled contours.  If you have 8 countour levels and specify $labelint=3 addlabels will attempt
       to label the 1st, 4th, and 7th contours.  $labelint defaults to 1.

       $segint specifies the density of labels on a single contour level.  Each contour level consists of a number of connected line segments,
       $segint defines how many of these segments get labels.  $segint defaults to 5, that is every fifth line segment will be labeled.

   set_colortable($table)
       Sets contour level colors based on the color table.

       $table is passed in as either a piddle of [3,n] colors, where n is the number of contour levels, or as a reference to a function which
       expects the number of contour levels as an argument and returns a [3,n] piddle.	It should be straight forward to use the
       PDL::Graphics::LUT tables in a function which subsets the 256 colors supplied by the look up table into the number of colors needed by
       Contours.

   coldhot_colortable()
       A simple colortable function for use with the set_colortable function.

       coldhot_colortable defines a blue red spectrum of colors where the smallest contour value is blue, the highest is red and the others are
       shades in between.

perl v5.14.2							    2011-03-30						       TriD::Contours(3pm)