square_grid

square_grid, an Octave code which generates a grid of points over the interior of a square in 2D.

The 2D square is the set of points (X(1),X(2)) such that:

         A(I) <= X(I) <= B(I)
       

For each dimension I, a set of parameters is input:

• NS(I), the number of points along the I-th coordinate direction;
• A(I), B(I), the left and right endpoints of the I-th coordinate.
• C(I), one of 5 choices for centering the grid in the I-th coordinate.

The centering options allow the user to control the centering of the equally spaced points. This is easiest to illustrate if we look at a 1 dimensional case and assume A = 0 and B = 1. Then, using NS = 4, the centering options will produce 4 equally spaced points as follows:

• 1: 0, 1/3, 2/3, 1 (include endpoints)
• 2: 1/5, 2/5, 3/5, 4/5 (do not include endpoints)
• 3: 0, 1/4, 2/4, 3/4 (do not include right endpoint)
• 4: 1/4, 2/4, 3/4, 1 (do not include left endpoint)
• 5: 1/8, 3/8, 5/8, 7/8 (half spacing at the ends)

Licensing:

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

Languages:

square_grid is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.

Related Data and Programs:

square_grid_test

octave_grid, an Octave code which generates a regular grid of points inside a variety of regions in one, two, three or many dimensions.

Source Code:

• square_grid.m, grid points over the interior of a square in 2D.
• r8mat_transpose_print.m, prints an R8MAT, transposed.
• r8mat_transpose_print_some.m, prints some of an R8MAT, transposed.
• r8vec_direct_product.m, creates a direct product of R8VEC's.