PCISApplySchur#

applies the Schur complement arising from the MATIS inside the PCNN preconditioner

Synopsis#

#include "petscpc.h" 
PetscErrorCode PCISApplySchur(PC pc, Vec v, Vec vec1_B, Vec vec2_B, Vec vec1_D, Vec vec2_D)

Input Parameters#

  • pc - preconditioner context

  • v - vector to which the Schur complement is to be applied (it is NOT modified inside this function, UNLESS vec2_B is null)

  • vec1_B - location to store the result of Schur complement applied to chunk

  • vec2_B - workspace or NULL, v is used as workspace in that case

  • vec1_D - work space

  • vec2_D - work space

See Also#

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

Level#

advanced

Location#

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

Index of all PC routines
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Index of all manual pages