int PCModifySubMatrices(PC pc,int nsub,IS *row,IS *col,Mat *submat,void *ctx)Collective on PC
pc | - the preconditioner context |
nsub | - the number of local submatrices |
row | - an array of index sets that contain the global row numbers that comprise each local submatrix |
col | - an array of index sets that contain the global column numbers that comprise each local submatrix |
submat | - array of local submatrices |
ctx | - optional user-defined context for private data for the user-defined routine (may be null) |
The basic submatrices are extracted from the preconditioner matrixas usual; the user can then alter these (for example, to set differentboundary conditions for each submatrix) before they are used for thelocal solves.
Location: src/pc/interface/precon.c
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