/*
Routines for setting the bilinear form
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SLEPc - Scalable Library for Eigenvalue Problem Computations
Copyright (c) 2002-2010, Universidad Politecnica de Valencia, Spain
This file is part of SLEPc.
SLEPc is free software: you can redistribute it and/or modify it under the
terms of version 3 of the GNU Lesser General Public License as published by
the Free Software Foundation.
SLEPc is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with SLEPc. If not, see <http://www.gnu.org/licenses/>.
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*/
#include "private/ipimpl.h" /*I "slepcip.h" I*/
#undef __FUNCT__
#define __FUNCT__ "IPSetBilinearForm"
/*@
IPSetBilinearForm - Specifies the bilinear form to be used for
inner products.
Collective on IP
Input Parameters:
+ ip - the inner product context
. mat - the matrix of the bilinear form (may be PETSC_NULL)
- form - the type of bilinear form
Note:
This function is called by EPSSetProblemType() and usually need not be
called by the user.
Level: developer
.seealso: IPGetBilinearForm(), IPInnerProduct(), IPNorm(), EPSSetProblemType(),
IPBilinearForm
@*/
PetscErrorCode IPSetBilinearForm(IP ip,Mat mat,IPBilinearForm form)
{
PetscErrorCode ierr;
PetscFunctionBegin;
PetscValidHeaderSpecific(ip,IP_CLASSID,1);
if (mat) {
PetscValidHeaderSpecific(mat,MAT_CLASSID,1);
PetscObjectReference((PetscObject)mat);
}
if (ip->matrix) {
ierr = MatDestroy(ip->matrix);CHKERRQ(ierr);
ierr = VecDestroy(ip->Bx);CHKERRQ(ierr);
}
ip->matrix = mat;
ip->bilinear_form = form;
ip->xid = ip->xstate = 0;
if (mat) { ierr = MatGetVecs(mat,&ip->Bx,PETSC_NULL);CHKERRQ(ierr); }
PetscFunctionReturn(0);
}
#undef __FUNCT__
#define __FUNCT__ "IPGetBilinearForm"
/*@C
IPGetBilinearForm - Retrieves the bilinear form to be used for
inner products.
Input Parameter:
. ip - the inner product context
Output Parameter:
+ mat - the matrix of the bilinear form (may be PETSC_NULL)
- form - the type of bilinear form
Level: developer
.seealso: IPSetBilinearForm(), IPInnerProduct(), IPNorm(), EPSSetProblemType(),
IPBilinearForm
@*/
PetscErrorCode IPGetBilinearForm(IP ip,Mat* mat,IPBilinearForm* form)
{
PetscFunctionBegin;
PetscValidHeaderSpecific(ip,IP_CLASSID,1);
if (mat) *mat = ip->matrix;
if (form) *form = ip->bilinear_form;
PetscFunctionReturn(0);
}
#undef __FUNCT__
#define __FUNCT__ "IPApplyMatrix_Private"
PetscErrorCode IPApplyMatrix_Private(IP ip,Vec x)
{
PetscErrorCode ierr;
PetscFunctionBegin;
if (((PetscObject)x)->id != ip->xid || ((PetscObject)x)->state != ip->xstate) {
ierr = PetscLogEventBegin(IP_ApplyMatrix,ip,0,0,0);CHKERRQ(ierr);
ierr = MatMult(ip->matrix,x,ip->Bx);CHKERRQ(ierr);
ip->xid = ((PetscObject)x)->id;
ip->xstate = ((PetscObject)x)->state;
ierr = PetscLogEventEnd(IP_ApplyMatrix,ip,0,0,0);CHKERRQ(ierr);
}
PetscFunctionReturn(0);
}
#undef __FUNCT__
#define __FUNCT__ "IPApplyMatrix"
/*@
IPApplyMatrix - Multiplies a vector with the matrix associated to the
bilinear form.
Collective on IP
Input Parameters:
+ ip - the inner product context
- x - the vector
Output Parameter:
. y - the result
Note:
If the bilinear form has no associated matrix this function copies the vector.
Level: developer
.seealso: IPSetBilinearForm(), IPInnerProduct(), IPNorm(), EPSSetProblemType()
@*/
PetscErrorCode IPApplyMatrix(IP ip,Vec x,Vec y)
{
PetscErrorCode ierr;
PetscFunctionBegin;
PetscValidHeaderSpecific(ip,IP_CLASSID,1);
if (ip->matrix) {
ierr = IPApplyMatrix_Private(ip,x);CHKERRQ(ierr);
ierr = VecCopy(ip->Bx,y);CHKERRQ(ierr);
} else {
ierr = VecCopy(x,y);CHKERRQ(ierr);
}
PetscFunctionReturn(0);
}