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write_grid command


write_grid filename keyword arg ... 


write_grid data.grid
write_grid data.grid custom flags 


Write a grid file in text format listing the grid cell IDs in the current hierarchical grid. See the read_grid and create_grid commands, as well as Section 6.8 of the manual for a definition of hierarchical grids and grid cell IDs as used by SPARTA.

The file is in the following format which is the same as the input file used by the read_grid command. Thus the file can be used to start a subsequent simulation with the same grid topology.

Description line 
N cells
M levels
n1 n2 n3 level-1
n1 n2 n3 level-2
n1 n2 n3 level-M 
id1 (custom1a) (custom1b) ...
id2 (custom2a) (custom2b) ...
idN (customNa) (customNb) ...  

The file begins with an arbitrary description line followed by zero or more blank lines. The header section of the file then lists the number of grid cells N and the number of levels M in the hierarchical grid. For each level the n1, n2, n3 values give the size of the sub-grid that parent cells (one level lower) are sub-divided into at this level. The lines in the header section can be in any order except the the number of levels M must appear before any of the level-* lines. A blank line ends the header section.

The Cells section of the file lists all the grid cell IDs, one per line. They may be in arbitrary order, particularly if the file is written in parallel, where each processor contributes a subset of the grid cell IDs.

If the optional custom keyword is specified along with the name of a custom per-grid vector or array, then the per-grid values for that vector or array are added following the grid cell ID. A per-grid vector is a single value per grid cell; a per-grid array is 1 or more values per grid cell, depending on how it was defined. If the custom keyword is used multiple times, then the value(s) for each name are appended in the order the custom keywords are specified.

Restrictions: none

Related commands:

read_grid, create_grid

Default: none