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<html>
<head>
<title>
CIRCLE_GRID - Grid Points Within a Circle
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
CIRCLE_GRID <br> Grid Points Within a Circle
</h1>
<hr>
<p>
<b>CIRCLE_GRID</b>
is a FORTRAN90 library which
generates the grid points that lie inside a circle.
</p>
<p>
The library allows the user to define an arbitrary circle by
choosing its radius and center. The user also chooses N, the number
of subintervals into which the horizontal radius line will be subdivided.
It then returns the gridpoints defined by that choice.
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and 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>CIRCLE_GRID</b> is available in
<a href = "../../c_src/circle_grid/circle_grid.html">a C version</a> and
<a href = "../../cpp_src/circle_grid/circle_grid.html">a C++ version</a> and
<a href = "../../f77_src/circle_grid/circle_grid.html">a FORTRAN77 version</a> and
<a href = "../../f_src/circle_grid/circle_grid.html">a FORTRAN90 version</a> and
<a href = "../../m_src/circle_grid/circle_grid.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/ball_grid/ball_grid.html">
BALL_GRID</a>,
a FORTRAN90 library which
computes grid points that lie inside a 3D ball.
</p>
<p>
<a href = "../../f_src/circle_arc_grid/circle_arc_grid.html">
CIRCLE_ARC_GRID</a>,
a FORTRAN90 program which
computes points equally spaced along a circular arc;
</p>
<p>
<a href = "../../f_src/ellipse_grid/ellipse_grid.html">
ELLIPSE_GRID</a>,
a FORTRAN90 library which
computes grid points that lie inside an ellipse.
</p>
<p>
<a href = "../../f_src/ellipsoid_grid/ellipsoid_grid.html">
ELLIPSOID_GRID</a>,
a FORTRAN90 library which
computes grid points that lie inside a 3D ellipsoid.
</p>
<p>
<a href = "../../f_src/tetrahedron_grid/tetrahedron_grid.html">
TETRAHEDRON_GRID</a>,
a FORTRAN90 library which
computes a tetrahedral grid of points.
</p>
<p>
<a href = "../../f_src/triangle_grid/triangle_grid.html">
TRIANGLE_GRID</a>,
a FORTRAN90 library which
computes a triangular grid of points.
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "circle_grid.f90">circle_grid.f90</a>, the source code.
</li>
<li>
<a href = "circle_grid.sh">circle_grid.sh</a>,
BASH commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "circle_grid_prb.f90">circle_grid_prb.f90</a>,
a sample calling program.
</li>
<li>
<a href = "circle_grid_prb.sh">circle_grid_prb.sh</a>,
BASH commands to compile and run the sample program.
</li>
<li>
<a href = "circle_grid_prb_output.txt">circle_grid_prb_output.txt</a>,
the output file.
</li>
<li>
<a href = "circle_grid_test01.xy">circle_grid_test01.xy</a>,
the list of grid points.
</li>
<li>
<a href = "circle_grid_test01.png">circle_grid_test01.png</a>,
an image of the points.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>CIRCLE_GRID</b> computes grid points inside a circle.
</li>
<li>
<b>CIRCLE_GRID_COUNT</b> counts the grid points inside a circle.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>R82VEC_PRINT_PART</b> prints "part" of an R82VEC.
</li>
<li>
<b>R8MAT_WRITE</b> writes an R8MAT file.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../f_src.html">
the FORTRAN90 source codes</a>.
</p>
<hr>
<i>
Last revised on 09 November 2011.
</i>
<!-- John Burkardt -->
</body>
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</html>