numgrid

numgrid, a MATLAB code which defines and numbers a subset of the nodes in a regular nxn grid of the [-1,+1]x[-1,+1] unit square. MATLAB includes a built-in version of this function.

The regions that can be defined include

• S: the entire square.
• L: the L-shaped domain made from 3/4 of the entire square.
• C: like the 'L', but with a quarter circle in the 4-th square.
• D: the unit disk.
• A: an annulus.
• H: a heart-shaped cardioid.
• B: the exterior of a "Butterfly".

Licensing:

Based on code that is copyright 1984-2015 The MathWorks, Inc.

Languages:

numgrid is available in a MATLAB version and an Octave version and a Python version.

Related Data and Programs:

numgrid_test

Source Code:

• numgrid.m, returns a node numbering.