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Finite Element Analysis Toolbox
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gridbdr.m File Reference


GRIDBDR Generate grid boundary information.

[ B ] = GRIDBDR( P, C, A, THLIM, FIX_BDR, B0 ) Given arrays P, C and A with cell connectivities and adjacency information generates an array with boundary information. The last three input arguments are optional.

Input       Value/(Size)           Description
p           (n_sdim,n_p)           Coordinate array for grid vertices.
c           (n_pcell,n_cells)      Cell connectivity pointer array where the
                                   entries in each column correspond to the
                                   cell vertex numbers.
a           (n_pcell,n_cells)      Array with cell adjacency pointers where
                                   the entries in each column correspond to
                                   the neighbouring cell number for each edge
                                   or face. A zero entry indicates that the
                                   edge/face belongs to a boundary.
thlim       scalar {0.77}          boundary edge detection limit, splits boundaries
                                   with cos(normal angles) less than thlim.
fix_bdr     logical {0}            collect all boundary edges to the same boundary
b0          (4/5/6,n_b0)           Array of partially precomputed boundaries
Output      Value/(Size)           Description
b           (4/5/6,n_b)            Array with boundary information, the first row
                                   indicates the cell number, followed by cell
                                   edge/face, boundary number, and the components
                                   of the normal vector for each boundary edge/face
See also