<!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>Three-dimensional Geometric Shapes (GNU Octave (version 5.1.0))</title> <meta name="description" content="Three-dimensional Geometric Shapes (GNU Octave (version 5.1.0))"> <meta name="keywords" content="Three-dimensional Geometric Shapes (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="Three_002dDimensional-Plots.html#Three_002dDimensional-Plots" rel="up" title="Three-Dimensional Plots"> <link href="Plot-Annotations.html#Plot-Annotations" rel="next" title="Plot Annotations"> <link href="Three_002ddimensional-Function-Plotting.html#Three_002ddimensional-Function-Plotting" rel="prev" title="Three-dimensional Function 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="Three_002ddimensional-Geometric-Shapes"></a> <div class="header"> <p> Previous: <a href="Three_002ddimensional-Function-Plotting.html#Three_002ddimensional-Function-Plotting" accesskey="p" rel="prev">Three-dimensional Function Plotting</a>, Up: <a href="Three_002dDimensional-Plots.html#Three_002dDimensional-Plots" accesskey="u" rel="up">Three-Dimensional Plots</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="Three_002ddimensional-Geometric-Shapes-1"></a> <h4 class="subsubsection">15.2.2.3 Three-dimensional Geometric Shapes</h4> <a name="XREFcylinder"></a><dl> <dt><a name="index-cylinder"></a><em></em> <strong>cylinder</strong></dt> <dt><a name="index-cylinder-1"></a><em></em> <strong>cylinder</strong> <em>(<var>r</var>)</em></dt> <dt><a name="index-cylinder-2"></a><em></em> <strong>cylinder</strong> <em>(<var>r</var>, <var>n</var>)</em></dt> <dt><a name="index-cylinder-3"></a><em></em> <strong>cylinder</strong> <em>(<var>hax</var>, …)</em></dt> <dt><a name="index-cylinder-4"></a><em>[<var>x</var>, <var>y</var>, <var>z</var>] =</em> <strong>cylinder</strong> <em>(…)</em></dt> <dd><p>Plot a 3-D unit cylinder. </p> <p>The optional input <var>r</var> is a vector specifying the radius along the unit z-axis. The default is [1 1] indicating radius 1 at <code>Z == 0</code> and at <code>Z == 1</code>. </p> <p>The optional input <var>n</var> determines the number of faces around the circumference of the cylinder. The default value is 20. </p> <p>If the first argument <var>hax</var> is an axes handle, then plot into this axes, rather than the current axes returned by <code>gca</code>. </p> <p>If outputs are requested <code>cylinder</code> returns three matrices in <code>meshgrid</code> format, such that <code>surf (<var>x</var>, <var>y</var>, <var>z</var>)</code> generates a unit cylinder. </p> <p>Example: </p> <div class="example"> <pre class="example">[x, y, z] = cylinder (10:-1:0, 50); surf (x, y, z); title ("a cone"); </pre></div> <p><strong>See also:</strong> <a href="#XREFellipsoid">ellipsoid</a>, <a href="Two_002ddimensional-Geometric-Shapes.html#XREFrectangle">rectangle</a>, <a href="#XREFsphere">sphere</a>. </p></dd></dl> <a name="XREFsphere"></a><dl> <dt><a name="index-sphere"></a><em></em> <strong>sphere</strong> <em>()</em></dt> <dt><a name="index-sphere-1"></a><em></em> <strong>sphere</strong> <em>(<var>n</var>)</em></dt> <dt><a name="index-sphere-2"></a><em></em> <strong>sphere</strong> <em>(<var>hax</var>, …)</em></dt> <dt><a name="index-sphere-3"></a><em>[<var>x</var>, <var>y</var>, <var>z</var>] =</em> <strong>sphere</strong> <em>(…)</em></dt> <dd><p>Plot a 3-D unit sphere. </p> <p>The optional input <var>n</var> determines the number of faces around the circumference of the sphere. The default value is 20. </p> <p>If the first argument <var>hax</var> is an axes handle, then plot into this axes, rather than the current axes returned by <code>gca</code>. </p> <p>If outputs are requested <code>sphere</code> returns three matrices in <code>meshgrid</code> format such that <code>surf (<var>x</var>, <var>y</var>, <var>z</var>)</code> generates a unit sphere. </p> <p>Example: </p> <div class="example"> <pre class="example">[x, y, z] = sphere (40); surf (3*x, 3*y, 3*z); axis equal; title ("sphere of radius 3"); </pre></div> <p><strong>See also:</strong> <a href="#XREFcylinder">cylinder</a>, <a href="#XREFellipsoid">ellipsoid</a>, <a href="Two_002ddimensional-Geometric-Shapes.html#XREFrectangle">rectangle</a>. </p></dd></dl> <a name="XREFellipsoid"></a><dl> <dt><a name="index-ellipsoid"></a><em></em> <strong>ellipsoid</strong> <em>(<var>xc</var>, <var>yc</var>, <var>zc</var>, <var>xr</var>, <var>yr</var>, <var>zr</var>, <var>n</var>)</em></dt> <dt><a name="index-ellipsoid-1"></a><em></em> <strong>ellipsoid</strong> <em>(…, <var>n</var>)</em></dt> <dt><a name="index-ellipsoid-2"></a><em></em> <strong>ellipsoid</strong> <em>(<var>hax</var>, …)</em></dt> <dt><a name="index-ellipsoid-3"></a><em>[<var>x</var>, <var>y</var>, <var>z</var>] =</em> <strong>ellipsoid</strong> <em>(…)</em></dt> <dd><p>Plot a 3-D ellipsoid. </p> <p>The inputs <var>xc</var>, <var>yc</var>, <var>zc</var> specify the center of the ellipsoid. The inputs <var>xr</var>, <var>yr</var>, <var>zr</var> specify the semi-major axis lengths. </p> <p>The optional input <var>n</var> determines the number of faces around the circumference of the cylinder. The default value is 20. </p> <p>If the first argument <var>hax</var> is an axes handle, then plot into this axes, rather than the current axes returned by <code>gca</code>. </p> <p>If outputs are requested <code>ellipsoid</code> returns three matrices in <code>meshgrid</code> format, such that <code>surf (<var>x</var>, <var>y</var>, <var>z</var>)</code> generates the ellipsoid. </p> <p><strong>See also:</strong> <a href="#XREFcylinder">cylinder</a>, <a href="Two_002ddimensional-Geometric-Shapes.html#XREFrectangle">rectangle</a>, <a href="#XREFsphere">sphere</a>. </p></dd></dl> <hr> <div class="header"> <p> Previous: <a href="Three_002ddimensional-Function-Plotting.html#Three_002ddimensional-Function-Plotting" accesskey="p" rel="prev">Three-dimensional Function Plotting</a>, Up: <a href="Three_002dDimensional-Plots.html#Three_002dDimensional-Plots" accesskey="u" rel="up">Three-Dimensional Plots</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> </body> </html>