PCISApplyInvSchur#

Solves the Neumann problem related to applying the inverse of the Schur complement.

Synopsis#

#include "petscpc.h" 
PetscErrorCode PCISApplyInvSchur(PC pc, Vec b, Vec x, Vec vec1_N, Vec vec2_N)

Input Parameters#

  • pc - preconditioner context

  • b - vector of local interface nodes (including ghosts)

  • x - vector of local interface nodes (including ghosts); returns the application of the inverse of the Schur complement to b

  • vec1_N - vector of local nodes (interior and interface, including ghosts); used as work space

  • vec2_N - vector of local nodes (interior and interface, including ghosts); used as work space

Note#

Solves the problem

  [ A_II  A_IB ] [ . ]   [ 0 ]
  [            ] [   ] = [   ]
  [ A_BI  A_BB ] [ x ]   [ b ]

See Also#

KSP: Linear System Solvers, PCBDDC, PCNN, PCISSetUseStiffnessScaling(), PCISSetSubdomainDiagonalScaling(), PCISScatterArrayNToVecB(), PCISSetSubdomainScalingFactor(), PCISReset(), PCISInitialize()

Level#

advanced

Location#

src/ksp/pc/impls/is/pcis.c

Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages