CIRCLE_GRID
Grid Points Within a Circle

CIRCLE_GRID is a MATLAB library which generates the grid points that lie inside a circle.

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.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

CIRCLE_GRID is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

BALL_GRID, a MATLAB library which computes grid points that lie inside a 3D ball.

CIRCLE_ARC_GRID, a MATLAB program which computes points equally spaced along a circular arc;

ELLIPSE_GRID, a MATLAB library which computes grid points that lie inside an ellipse.

ELLIPSOID_GRID, a MATLAB library which computes grid points that lie inside a 3D ellipsoid.

TETRAHEDRON_GRID, a MATLAB library which computes a tetrahedral grid of points.

TRIANGLE_GRID, a MATLAB library which computes a triangular grid of points.

Source Code:

• circle_grid.m, computes grid points inside a circle.
• circle_grid_count.m, counts grid points inside a circle.
• circle_grid_display.m, displays grid points inside a circle.
• r82vec_print_part.m, prints part of a vector of (X,Y) data.
• r8mat_write.m, writes an R8MAT to a file.
• timestamp.m, prints the current YMDHMS date as a time stamp.

Examples and Tests:

• circle_grid_test.m, calls all the tests.
• circle_grid_test_output.txt, the output file.
• circle_grid_test01.m, requests the grid points inside a circle.
• circle_grid_test01.xy, the list of grid points.
• circle_grid_test01.png, an image of the points.

You can go up one level to the MATLAB source codes.