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<html>
<head>
<title>
HAND_DATA - Numerical Exercises Using the Shape of a Hand
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
HAND_DATA <br> Numerical Exercises Using the Shape of a Hand
</h1>
<hr>
<p>
<b>HAND_DATA</b>
is a set of MATLAB programs which
carry out some numerical exercises based on data that came from
tracing several points on a person's hand.
</p>
<p>
The original proposer of this exercise was Cleve Moler, in the
textbook <i>Numerical Computing with MATLAB</i>.
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>HAND_DATA</b> is available in
<a href = "../../m_src/hand_data/hand_data.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../m_src/convex_hull/convex_hull.html">
CONVEX_HULL</a>,
a MATLAB program which
demonstrates the computation of the convex hull of a set of 2D points.
</p>
<p>
<a href = "../../m_src/mesh2d_hand/mesh2d_hand.html">
MESH2D_HAND</a>,
a MATLAB program which
reads in a set of 59 points which outline a human hand,
and calls MESH2D, which is able to create a fine triangular
mesh of the region outlined by the points.
</p>
<p>
<a href = "../../datasets/polygon/polygon.html">
POLYGON</a>,
a dataset directory which
contains examples of polygons.
</p>
<p>
<a href = "../../m_src/triangulate/triangulate.html">
TRIANGULATE</a>,
a MATLAB program which
triangulates a polygonal region.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ul>
<li>
Cleve Moler,<br>
Numerical Computing with MATLAB,<br>
SIAM, 2004,<br>
ISBN13: 978-0-898716-60-3,<br>
LC: QA297.M625.
</li>
</ul>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "hand_acquire.m">hand_acquire.m</a>
guides a user through the steps of recording hand data from the screen.
</li>
<li>
<a href = "hand_plot.m">hand_plot.m</a>
plots the hand data after it has been acquired.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "hand_data.png">hand_data.png</a>,
an image of hand data.
</li>
<li>
<a href = "x.txt">x.txt</a>,
the X coordinates of a hand.
</li>
<li>
<a href = "y.txt">y.txt</a>,
the Y coordinates of a hand.
</li>
<li>
<a href = "hand_nodes.txt">hand_nodes.txt</a>,
the X and Y coordinates of a hand in a single file.
</li>
</ul>
</p>
<p>
The <b>CONVEX_HULL</b> program demonstrates how the computation of the convex
hull of the hand data.
<ul>
<li>
<a href = "../../m_src/convex_hull/convex_hull.m">convex_hull.m</a>,
a program to compute the convex hull.
</li>
<li>
<a href = "hand_hull.png">hand_hull.png</a>,
a PNG image.
</li>
</ul>
</p>
<p>
The <b>SPLINE</b> program demonstrates how the X and Y hand data can be used
to generate smooth spline functions X(T), Y(T) which can be plotted to yield
a smooth looking curve.
<ul>
<li>
<a href = "hand_spline.m">hand_spline.m</a>,
computes and plots the spline functions.
</li>
<li>
<a href = "hand_spline.png">hand_spline.png</a>,
a PNG image.
</li>
</ul>
</p>
<p>
The <b>TRANSFORMATION</b> programs demonstrate linear transformations
applied to the hand data.
<ul>
<li>
<a href = "hand_dilation.m">hand_dilation.m</a>,
dilates the data.
</li>
<li>
<a href = "hand_dilation.png">hand_dilation.png</a>,
a PNG image.
</li>
<li>
<a href = "hand_linear.m">hand_linear.m</a>,
computes xy2 = A * xy + b for general A and b.
</li>
<li>
<a href = "hand_linear.png">hand_linear.png</a>,
a PNG image.
</li>
<li>
<a href = "hand_negation.m">hand_negation.m</a>,
computes xy2 = - xy.
</li>
<li>
<a href = "hand_negation.png">hand_negation.png</a>,
a PNG image.
</li>
<li>
<a href = "hand_reflection.m">hand_reflection.m</a>,
computes xy2 and xy3 as x and y reflections of the data.
</li>
<li>
<a href = "hand_reflection.png">hand_reflection.png</a>,
a PNG image.
</li>
<li>
<a href = "hand_rotation.m">hand_rotation.m</a>,
computes xy2 = A*xy where A is a rotation matrix.
</li>
<li>
<a href = "hand_rotation.png">hand_rotation.png</a>,
a PNG image.
</li>
<li>
<a href = "hand_translation.m">hand_translation.m</a>,
computes xy2 = xy + b.
</li>
<li>
<a href = "hand_translation.png">hand_translation.png</a>,
a PNG image.
</li>
</ul>
</p>
<p>
The <b>TRIANGULATE</b> program can be used to triangulate the hand.
<ul>
<li>
<a href = "hand_triangulated.png">hand_triangulated.png</a>,
a PNG image of the triangulated polygon.
</li>
<li>
<a href = "hand_elements.txt">hand_elements.txt</a>,
the output file of triangles that make up the polygon.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../m_src.html">
the MATLAB source codes</a>.
</p>
<hr>
<i>
Last revised on 18 April 2011.
</i>
<!-- John Burkardt -->
</body>
</html>