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<a name="Three_002ddimensional-Geometric-Shapes"></a>
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<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>
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<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>Command: <em></em> <strong>cylinder</strong></dt>
<dt><a name="index-cylinder-1"></a>Function File: <em></em> <strong>cylinder</strong> <em>(<var>r</var>)</em></dt>
<dt><a name="index-cylinder-2"></a>Function File: <em></em> <strong>cylinder</strong> <em>(<var>r</var>, <var>n</var>)</em></dt>
<dt><a name="index-cylinder-3"></a>Function File: <em></em> <strong>cylinder</strong> <em>(<var>hax</var>, …)</em></dt>
<dt><a name="index-cylinder-4"></a>Function File: <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 axis,
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>Function File: <em></em> <strong>sphere</strong> <em>()</em></dt>
<dt><a name="index-sphere-1"></a>Function File: <em></em> <strong>sphere</strong> <em>(<var>n</var>)</em></dt>
<dt><a name="index-sphere-2"></a>Function File: <em></em> <strong>sphere</strong> <em>(<var>hax</var>, …)</em></dt>
<dt><a name="index-sphere-3"></a>Function File: <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 axis,
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>Function File: <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>Function File: <em></em> <strong>ellipsoid</strong> <em>(…, <var>n</var>)</em></dt>
<dt><a name="index-ellipsoid-2"></a>Function File: <em></em> <strong>ellipsoid</strong> <em>(<var>hax</var>, …)</em></dt>
<dt><a name="index-ellipsoid-3"></a>Function File: <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 axis,
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>
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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>
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