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/*

  SLEPc eigensolver: "gd"

   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

   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/>.

   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

*/

#include "private/epsimpl.h"                /*I "slepceps.h" I*/

#include "private/stimpl.h"

#include "../src/eps/impls/davidson/common/davidson.h"

#include "slepcblaslapack.h"

PetscErrorCode EPSSetUp_GD(EPS eps);

PetscErrorCode EPSDestroy_GD(EPS eps);

EXTERN_C_BEGIN

#undef __FUNCT__  

#define __FUNCT__ "EPSSetFromOptions_GD"

PetscErrorCode EPSSetFromOptions_GD(EPS eps)

{

  PetscErrorCode  ierr;

  PetscBool       flg,op;

  PetscInt        opi,opi0;

  PetscFunctionBegin;

  ierr = PetscOptionsBegin(((PetscObject)eps)->comm,((PetscObject)eps)->prefix,"GD Options","EPS");CHKERRQ(ierr);

  ierr = EPSGDGetKrylovStart(eps, &op); CHKERRQ(ierr);

  ierr = PetscOptionsBool("-eps_gd_krylov_start","Start the searching subspace with a krylov basis","EPSGDSetKrylovStart",op,&op,&flg); CHKERRQ(ierr);

  if(flg) { ierr = EPSGDSetKrylovStart(eps, op); CHKERRQ(ierr); }

  ierr = EPSGDGetBlockSize(eps, &opi); CHKERRQ(ierr);

  ierr = PetscOptionsInt("-eps_gd_blocksize","Number vectors add to the searching subspace (if 0, nev employed)","EPSGDSetBlockSize",opi,&opi,&flg); CHKERRQ(ierr);

  if(flg) { ierr = EPSGDSetBlockSize(eps, opi); CHKERRQ(ierr); }

  ierr = EPSGDGetRestart(eps, &opi, &opi0); CHKERRQ(ierr);

  ierr = PetscOptionsInt("-eps_gd_minv","Set the size of the searching subspace after restarting (if 0, eps_gd_bs is employed)","EPSGDSetRestart",opi,&opi,&flg); CHKERRQ(ierr);

  if(flg) { ierr = EPSGDSetRestart(eps, opi, opi0); CHKERRQ(ierr); }

  ierr = PetscOptionsInt("-eps_gd_plusk","Set the number of saved eigenvectors from the previous iteration when restarting","EPSGDSetRestart",opi0,&opi0,&flg); CHKERRQ(ierr);

  if(flg) { ierr = EPSGDSetRestart(eps, opi, opi0); CHKERRQ(ierr); }

  ierr = EPSGDGetInitialSize(eps, &opi); CHKERRQ(ierr);

  ierr = PetscOptionsInt("-eps_gd_initial_size","Set the initial size of the searching subspace","EPSGDSetInitialSize",opi,&opi,&flg); CHKERRQ(ierr);

  if(flg) { ierr = EPSGDSetInitialSize(eps, opi); CHKERRQ(ierr); }

  ierr = PetscOptionsEnd();CHKERRQ(ierr);

  PetscFunctionReturn(0);

}  

EXTERN_C_END

#undef __FUNCT__  

#define __FUNCT__ "EPSSetUp_GD"

PetscErrorCode EPSSetUp_GD(EPS eps)

{

  PetscErrorCode  ierr;

  PetscBool       t;

  KSP             ksp;

  PetscFunctionBegin;

  /* Setup common for all davidson solvers */

  ierr = EPSSetUp_DAVIDSON(eps); CHKERRQ(ierr);

  /* Check some constraints */

  ierr = STSetUp(eps->OP); CHKERRQ(ierr);

  ierr = STGetKSP(eps->OP, &ksp); CHKERRQ(ierr);

  ierr = PetscTypeCompare((PetscObject)ksp, KSPPREONLY, &t); CHKERRQ(ierr);

  if (!t) SETERRQ(((PetscObject)eps)->comm,PETSC_ERR_SUP, "EPSGD only works with KSPPREONLY");

  PetscFunctionReturn(0);

}

EXTERN_C_BEGIN

#undef __FUNCT__  

#define __FUNCT__ "EPSCreate_GD"

PetscErrorCode EPSCreate_GD(EPS eps) {

  PetscErrorCode  ierr;

  PetscFunctionBegin;

  /* Load the DAVIDSON solver */

  ierr = EPSCreate_DAVIDSON(eps); CHKERRQ(ierr);

  /* Overload the GD properties */

  eps->ops->setfromoptions       = EPSSetFromOptions_GD;

  eps->ops->setup                = EPSSetUp_GD;

  eps->ops->destroy              = EPSDestroy_GD;

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDSetKrylovStart_C","EPSDAVIDSONSetKrylovStart_DAVIDSON",EPSDAVIDSONSetKrylovStart_DAVIDSON);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDGetKrylovStart_C","EPSDAVIDSONGetKrylovStart_DAVIDSON",EPSDAVIDSONGetKrylovStart_DAVIDSON);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDSetBlockSize_C","EPSDAVIDSONSetBlockSize_DAVIDSON",EPSDAVIDSONSetBlockSize_DAVIDSON);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDGetBlockSize_C","EPSDAVIDSONGetBlockSize_DAVIDSON",EPSDAVIDSONGetBlockSize_DAVIDSON);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDSetRestart_C","EPSDAVIDSONSetRestart_DAVIDSON",EPSDAVIDSONSetRestart_DAVIDSON);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDGetRestart_C","EPSDAVIDSONGetRestart_DAVIDSON",EPSDAVIDSONGetRestart_DAVIDSON);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDSetInitialSize_C","EPSDAVIDSONSetInitialSize_DAVIDSON",EPSDAVIDSONSetInitialSize_DAVIDSON);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDGetInitialSize_C","EPSDAVIDSONGetInitialSize_DAVIDSON",EPSDAVIDSONGetInitialSize_DAVIDSON);CHKERRQ(ierr);

  PetscFunctionReturn(0);

}

EXTERN_C_END

#undef __FUNCT__  

#define __FUNCT__ "EPSDestroy_GD"

PetscErrorCode EPSDestroy_GD(EPS eps)

{

  PetscErrorCode  ierr;

  PetscFunctionBegin;

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDSetKrylovStart_C","",PETSC_NULL);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDGetKrylovStart_C","",PETSC_NULL);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDSetBlockSize_C","",PETSC_NULL);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDGetBlockSize_C","",PETSC_NULL);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDSetRestart_C","",PETSC_NULL);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDGetRestart_C","",PETSC_NULL);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDSetInitialSize_C","",PETSC_NULL);CHKERRQ(ierr);

  ierr = PetscObjectComposeFunctionDynamic((PetscObject)eps,"EPSGDGetInitialSize_C","",PETSC_NULL);CHKERRQ(ierr);

  ierr = EPSDestroy_DAVIDSON(eps);

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "EPSGDSetKrylovStart"

/*@

   EPSGDSetKrylovStart - Activates or deactivates starting the searching

   subspace with a Krylov basis.

   Collective on EPS

   Input Parameters:

+  eps - the eigenproblem solver context

-  krylovstart - boolean flag

   Options Database Key:

.  -eps_gd_krylovstart - Activates starting the searching subspace with a

    Krylov basis

   Level: advanced

.seealso: EPSGDGetKrylovStart()

@*/

PetscErrorCode EPSGDSetKrylovStart(EPS eps,PetscBool krylovstart)

{

  PetscErrorCode ierr;

  PetscFunctionBegin;

  PetscValidHeaderSpecific(eps,EPS_CLASSID,1);

  ierr = PetscTryMethod(eps,"EPSGDSetKrylovStart_C",(EPS,PetscBool),(eps,krylovstart));CHKERRQ(ierr);

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "EPSGDGetKrylovStart"

/*@

   EPSGDGetKrylovStart - Gets if the searching subspace is started with a

   Krylov basis.

   Collective on EPS

   Input Parameter:

.  eps - the eigenproblem solver context

   Output Parameters:

.  krylovstart - boolean flag indicating if starting the searching subspace

   with a Krylov basis is enabled.

   Level: advanced

.seealso: EPSGDGetKrylovStart()

@*/

PetscErrorCode EPSGDGetKrylovStart(EPS eps,PetscBool *krylovstart)

{

  PetscErrorCode ierr;

  PetscFunctionBegin;

  PetscValidHeaderSpecific(eps,EPS_CLASSID,1);

  ierr = PetscTryMethod(eps,"EPSGDGetKrylovStart_C",(EPS,PetscBool*),(eps,krylovstart));CHKERRQ(ierr);

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "EPSGDSetBlockSize"

/*@

   EPSGDSetBlockSize - Sets the number of vectors added to the searching space

   every iteration.

   Collective on EPS

   Input Parameters:

+  eps - the eigenproblem solver context

-  blocksize - non-zero positive integer

   Options Database Key:

.  -eps_gd_blocksize - integer indicating the number of vectors added to the

   searching space every iteration.

   Level: advanced

.seealso: EPSGDSetKrylovStart()

@*/

PetscErrorCode EPSGDSetBlockSize(EPS eps,PetscInt blocksize)

{

  PetscErrorCode ierr;

  PetscFunctionBegin;

  PetscValidHeaderSpecific(eps,EPS_CLASSID,1);

  ierr = PetscTryMethod(eps,"EPSGDSetBlockSize_C",(EPS,PetscInt),(eps,blocksize));CHKERRQ(ierr);

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "EPSGDGetBlockSize"

/*@

   EPSGDGetBlockSize - Gets the number of vectors added to the searching space

   every iteration.

   Collective on EPS

   Input Parameter:

.  eps - the eigenproblem solver context

   Output Parameter:

.  blocksize - integer indicating the number of vectors added to the searching

   space every iteration.

   Level: advanced

.seealso: EPSGDSetBlockSize()

@*/

PetscErrorCode EPSGDGetBlockSize(EPS eps,PetscInt *blocksize)

{

  PetscErrorCode ierr;

  PetscFunctionBegin;

  PetscValidHeaderSpecific(eps,EPS_CLASSID,1);

  ierr = PetscTryMethod(eps,"EPSGDGetBlockSize_C",(EPS,PetscInt*),(eps,blocksize));CHKERRQ(ierr);

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "EPSGDGetRestart"

/*@

   EPSGDGetRestart - Gets the number of vectors of the searching space after

   restarting and the number of vectors saved from the previous iteration.

   Collective on EPS

   Input Parameter:

.  eps - the eigenproblem solver context

   Output Parameter:

+  minv - non-zero positive integer indicating the number of vectors of the

   searching subspace after restarting

-  plusk - positive integer indicating the number of vectors saved from the

   previous iteration  

   Level: advanced

.seealso: EPSGDSetRestart()

@*/

PetscErrorCode EPSGDGetRestart(EPS eps,PetscInt *minv,PetscInt *plusk)

{

  PetscErrorCode ierr;

  PetscFunctionBegin;

  PetscValidHeaderSpecific(eps,EPS_CLASSID,1);

  ierr = PetscTryMethod(eps,"EPSGDGetRestart_C",(EPS,PetscInt*,PetscInt*),(eps,minv,plusk));CHKERRQ(ierr);

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "EPSGDSetRestart"

/*@

   EPSGDSetRestart - Sets the number of vectors of the searching space after

   restarting and the number of vectors saved from the previous iteration.

   Collective on EPS

   Input Parameters:

+  eps - the eigenproblem solver context

.  minv - non-zero positive integer indicating the number of vectors of the

   searching subspace after restarting

-  plusk - positive integer indicating the number of vectors saved from the

   previous iteration  

   Options Database Key:

+  -eps_gd_minv - non-zero positive integer indicating the number of vectors

    of the searching subspace after restarting

-  -eps_gd_plusk - positive integer indicating the number of vectors saved

    from the previous iteration  

   Level: advanced

.seealso: EPSGDSetRestart()

@*/

PetscErrorCode EPSGDSetRestart(EPS eps,PetscInt minv,PetscInt plusk)

{

  PetscErrorCode ierr;

  PetscFunctionBegin;

  PetscValidHeaderSpecific(eps,EPS_CLASSID,1);

  ierr = PetscTryMethod(eps,"EPSGDSetRestart_C",(EPS,PetscInt,PetscInt),(eps,minv,plusk));CHKERRQ(ierr);

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "EPSGDGetInitialSize"

/*@

   EPSGDGetInitialSize - Gets the initial size of the searching space. In the

   case of EPSGDGetKrylovStart is PETSC_FALSE and the user provides vectors by

   EPSSetInitialSpace, up to initialsize vectors will be used; and if the

   provided vectors are not enough, the solver completes the subspace with

   random vectors. In the case of EPSGDGetKrylovStart is PETSC_TRUE, the solver

   gets the first vector provided by the user or, if not, a random vector,

   and expands the Krylov basis up to initialsize vectors.

   Collective on EPS

   Input Parameter:

.  eps - the eigenproblem solver context

   Output Parameter:

.  initialsize - non-zero positive integer indicating the number of vectors of

   the initial searching subspace

   Level: advanced

.seealso: EPSGDSetInitialSize(), EPSGDGetKrylovStart()

@*/

PetscErrorCode EPSGDGetInitialSize(EPS eps,PetscInt *initialsize)

{

  PetscErrorCode ierr;

  PetscFunctionBegin;

  PetscValidHeaderSpecific(eps,EPS_CLASSID,1);

  ierr = PetscTryMethod(eps,"EPSGDGetInitialSize_C",(EPS,PetscInt*),(eps,initialsize));CHKERRQ(ierr);

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "EPSGDSetInitialSize"

/*@

   EPSGDSetInitialSize - Sets the initial size of the searching space. In the

   case of EPSGDGetKrylovStart is PETSC_FALSE and the user provides vectors by

   EPSSetInitialSpace, up to initialsize vectors will be used; and if the

   provided vectors are not enough, the solver completes the subspace with

   random vectors. In the case of EPSGDGetKrylovStart is PETSC_TRUE, the solver

   gets the first vector provided by the user or, if not, a random vector,

   and expands the Krylov basis up to initialsize vectors.

   Collective on EPS

   Input Parameters:

+  eps - the eigenproblem solver context

-  initialsize - non-zero positive integer indicating the number of vectors of

   the initial searching subspace

   Options Database Key:

.  -eps_gd_initial_size - non-zero positive integer indicating the number of

    vectors of the initial searching subspace

   Level: advanced

.seealso: EPSGDGetInitialSize(), EPSGDGetKrylovStart()

@*/

PetscErrorCode EPSGDSetInitialSize(EPS eps,PetscInt initialsize)

{

  PetscErrorCode ierr;

  PetscFunctionBegin;

  PetscValidHeaderSpecific(eps,EPS_CLASSID,1);

  ierr = PetscTryMethod(eps,"EPSGDSetInitialSize_C",(EPS,PetscInt),(eps,initialsize));CHKERRQ(ierr);

  PetscFunctionReturn(0);

}