petsc-3.7.5 2017-01-01
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MatFactorGetSchurComplement

 Get a Schur complement matrix object using the current Schur data

Synopsis

#include "petscmat.h" 
PetscErrorCode MatFactorGetSchurComplement(Mat F,Mat* S)
Logically Collective on Mat

Input Parameters

Notes

Schur complement mode is currently implemented for sequential matrices. The routine returns a dense matrix pointing to the raw data of the Schur Complement stored within the data strutures of the solver; e.g. if MatFactorInvertSchurComplement has been called, the returned matrix is actually the inverse of the Schur complement. The caller should call MatFactorRestoreSchurComplement when the object is no longer needed.

References

See Also

MatGetFactor(), MatFactorSetSchurIS(), MatFactorRestoreSchurComplement(), MatFactorCreateSchurComplement()

Level:advanced
Location:src/mat/interface/matrix.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages

F - the factored matrix obtained by calling MatGetFactor()
*S - location where to return the Schur complement (in MATDENSE format)