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<h5 class="subsubsection">15.1.2.2 Three-dimensional Geometric Shapes</h5>
<!-- ./plot/cylinder.m -->
<p><a name="doc_002dcylinder"></a>
<div class="defun">
— Function File: <b>cylinder</b><var><a name="index-cylinder-1050"></a></var><br>
— Function File: <b>cylinder</b> (<var>r</var>)<var><a name="index-cylinder-1051"></a></var><br>
— Function File: <b>cylinder</b> (<var>r, n</var>)<var><a name="index-cylinder-1052"></a></var><br>
— Function File: [<var>x</var>, <var>y</var>, <var>z</var>] = <b>cylinder</b> (<var><small class="dots">...</small></var>)<var><a name="index-cylinder-1053"></a></var><br>
— Function File: <b>cylinder</b> (<var>ax, <small class="dots">...</small></var>)<var><a name="index-cylinder-1054"></a></var><br>
<blockquote><p>Generates three matrices in <code>meshgrid</code> format, such that
<code>surf (</code><var>x</var><code>, </code><var>y</var><code>, </code><var>z</var><code>)</code> generates a unit cylinder.
The matrices are of size <var>n</var><code>+1</code>-by-<var>n</var><code>+1</code>.
<var>r</var> is a vector containing the radius along the z-axis.
If <var>n</var> or <var>r</var> are omitted then default values of 20 or [1 1]
are assumed.
<p>Called with no return arguments, <code>cylinder</code> calls directly
<code>surf (</code><var>x</var><code>, </code><var>y</var><code>, </code><var>z</var><code>)</code>. If an axes handle <var>ax</var>
is passed as the first argument, the surface is plotted to this set
of axes.
<p>Examples:
<pre class="example"> disp ("plotting a cone")
[x, y, z] = cylinder (10:-1:0,50);
surf (x, y, z);
</pre>
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<p class="noindent"><strong>See also:</strong> <a href="doc_002dsphere.html#doc_002dsphere">sphere</a>.
</p></blockquote></div>
<!-- ./plot/sphere.m -->
<p><a name="doc_002dsphere"></a>
<div class="defun">
— Function File: [<var>x</var>, <var>y</var>, <var>z</var>] = <b>sphere</b> (<var>n</var>)<var><a name="index-sphere-1055"></a></var><br>
— Function File: <b>sphere</b> (<var>h, <small class="dots">...</small></var>)<var><a name="index-sphere-1056"></a></var><br>
<blockquote><p>Generates three matrices in <code>meshgrid</code> format, such that
<code>surf (</code><var>x</var><code>, </code><var>y</var><code>, </code><var>z</var><code>)</code> generates a unit sphere.
The matrices of <var>n</var><code>+1</code>-by-<var>n</var><code>+1</code>. If <var>n</var> is
omitted then a default value of 20 is assumed.
<p>Called with no return arguments, <code>sphere</code> call directly
<code>surf (</code><var>x</var><code>, </code><var>y</var><code>, </code><var>z</var><code>)</code>. If an axes handle is passed
as the first argument, the surface is plotted to this set of axes.
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<p class="noindent"><strong>See also:</strong> <a href="doc_002dpeaks.html#doc_002dpeaks">peaks</a>.
</p></blockquote></div>
<!-- ./plot/ellipsoid.m -->
<p><a name="doc_002dellipsoid"></a>
<div class="defun">
— Function File: [<var>x</var>, <var>y</var>, <var>z</var>] = <b>ellipsoid</b> (<var>xc,yc, zc, xr, yr, zr, n</var>)<var><a name="index-ellipsoid-1057"></a></var><br>
— Function File: <b>ellipsoid</b> (<var>h, <small class="dots">...</small></var>)<var><a name="index-ellipsoid-1058"></a></var><br>
<blockquote><p>Generate three matrices in <code>meshgrid</code> format that define an
ellipsoid. Called with no return arguments, <code>ellipsoid</code> calls
directly <code>surf (</code><var>x</var><code>, </code><var>y</var><code>, </code><var>z</var><code>)</code>. If an axes handle
is passed as the first argument, the surface is plotted to this
set of axes.
<!-- Texinfo @sp should work but in practice produces ugly results for HTML. -->
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<p class="noindent"><strong>See also:</strong> <a href="doc_002dsphere.html#doc_002dsphere">sphere</a>.
</p></blockquote></div>
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