The Coarse Grid

The coarse grid is a tensor product grid defined by three (in 3D) resp. two (in 2D) one-dimensional grids. Each of these one-dimensional grid may be described by an explicit list of points and a number describing a regular subdivision.

x, y, z: Explicit List of Coordinates

These three lists of float values may be defined in the external control parameter file by statements like

x(0,1);
y(0,1);

(see test.ibg ).

The values have to be placed in increasing order.

There may be maximal MaxValues (defined in ibgextref.c) values in each list.

regular, regularX, regularY, regularZ, Regular Refinement

An additional regular refinement for the coarse grid may be also defined. regular is an abbreviation for regular in each direction.

If the related parameter is zero, there will be no additional refinement. Else, the number defines the number of additional points on each segment of the "coarse" coarse grid.

Example

y^
 |
1*---+---+---*-----------+-----------+-----------*
 |   |   |   |           |           |           |
 +---+---+---+-----------+-----------+-----------+
 |   |   |   |           |           |           |
 *---+---+---*-----------+-----------+-----------* ->x
0            1                                   4 

would be the result of

x(0,1,4);
y(0,1);
regularX = 2; 
regularY = 1;