MatLUFactorSymbolic

 Performs symbolic LU factorization of matrix. Call this routine before calling MatLUFactorNumeric().

Synopsis

#include "petscmat.h" 
int MatLUFactorSymbolic(Mat mat,IS row,IS col,MatLUInfo *info,Mat *fact)
Collective on Mat

Input Parameters

mat - the matrix
row, col - row and column permutations
info - options for factorization, includes 
         fill - expected fill as ratio of original fill.

         dtcol - pivot tolerance (0 no pivot, 1 full column pivoting)

                  Run with the option -log_info to determine an optimal value to use

Output Parameter

fact -new matrix that has been symbolically factored

Notes

See the users manual for additional information about choosing the fill factor for better efficiency.

Most users should employ the simplified SLES interface for linear solvers instead of working directly with matrix algebra routines such as this. See, e.g., SLESCreate().

See Also

MatLUFactor(), MatLUFactorNumeric(), MatCholeskyFactor(), MatLUInfo

Level:developer
Location:src/mat/interface/matrix.c
Index of all Mat routines
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Index of all manual pages