BALL_GRID
Grid Points Within a 3D Ball

BALL_GRID is a FORTRAN77 library which generates the grid points that lie inside a 3D ball.

The library allows the user to define an arbitrary ball by choosing its radius and center. The user also choose N, the number of subintervals into which a 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:

BALL_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:

CIRCLE_ARC_GRID, a FORTRAN77 program which computes points equally spaced along a circular arc;

CIRCLE_GRID, a FORTRAN77 library which computes grid points that lie inside a circle.

ELLIPSE_GRID, a FORTRAN77 library which computes grid points that lie inside an ellipse.

ELLIPSOID_GRID, a FORTRAN77 library which computes grid points that lie inside a 3D ellipsoid.

TETRAHEDRON_GRID, a FORTRAN77 library which computes a tetrahedral grid of points.

TRIANGLE_GRID, a FORTRAN77 library which computes a triangular grid of points.

Source Code:

• ball_grid.f, the source code.
• ball_grid.sh, BASH commands to compile the source code.

Examples and Tests:

• ball_grid_prb.f, a sample calling program.
• ball_grid_prb.sh, BASH commands to compile and run the sample program.
• ball_grid_prb_output.txt, the output file.
• ball_grid_test01.xyz, the list of grid points.
• ball_grid_test01.png, an image of the points.

List of Routines:

• BALL_GRID computes grid points inside a ball.
• BALL_GRID computes grid points inside a ball.
• GET_UNIT returns a free FORTRAN unit number.
• R83VEC_PRINT_PART prints "part" of an R83VEC.
• R8MAT_WRITE writes an R8MAT file.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

You can go up one level to the FORTRAN77 source codes.