<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Introduction to Plotting (GNU Octave (version 5.1.0))</title> <meta name="description" content="Introduction to Plotting (GNU Octave (version 5.1.0))"> <meta name="keywords" content="Introduction to Plotting (GNU Octave (version 5.1.0))"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <link href="index.html#Top" rel="start" title="Top"> <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> <link href="Plotting.html#Plotting" rel="up" title="Plotting"> <link href="High_002dLevel-Plotting.html#High_002dLevel-Plotting" rel="next" title="High-Level Plotting"> <link href="Plotting.html#Plotting" rel="prev" title="Plotting"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} div.smalllisp {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} pre.smalldisplay {font-family: inherit; font-size: smaller} pre.smallexample {font-size: smaller} pre.smallformat {font-family: inherit; font-size: smaller} pre.smalllisp {font-size: smaller} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> <link rel="stylesheet" type="text/css" href="octave.css"> </head> <body lang="en"> <a name="Introduction-to-Plotting"></a> <div class="header"> <p> Next: <a href="High_002dLevel-Plotting.html#High_002dLevel-Plotting" accesskey="n" rel="next">High-Level Plotting</a>, Up: <a href="Plotting.html#Plotting" accesskey="u" rel="up">Plotting</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> </div> <hr> <a name="Introduction-to-Plotting-1"></a> <h3 class="section">15.1 Introduction to Plotting</h3> <p>Earlier versions of Octave provided plotting through the use of gnuplot. This capability is still available. But, a newer plotting capability is provided by access to OpenGL. Which plotting system is used is controlled by the <code>graphics_toolkit</code> function. See <a href="Graphics-Toolkits.html#Graphics-Toolkits">Graphics Toolkits</a>. </p> <p>The function call <code>graphics_toolkit ("qt")</code> selects the Qt/OpenGL system, <code>graphics_toolkit ("fltk")</code> selects the FLTK/OpenGL system, and <code>graphics_toolkit ("gnuplot")</code> selects the gnuplot system. The three systems may be used selectively through the use of the <code>graphics_toolkit</code> property of the graphics handle for each figure. This is explained in <a href="Graphics-Data-Structures.html#Graphics-Data-Structures">Graphics Data Structures</a>. <strong>Caution:</strong> The OpenGL-based toolkits use single precision variables internally which limits the maximum value that can be displayed to approximately <em>10^{38}</em>. If your data contains larger values you must use the gnuplot toolkit which supports values up to <em>10^{308}</em>. </p> </body> </html>