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/*

      QEP routines related to monitors.

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

   SLEPc - Scalable Library for Eigenvalue Problem Computations

   Copyright (c) 2002-2011, Universitat 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/qepimpl.h>      /*I "slepcqep.h" I*/

#undef __FUNCT__  

#define __FUNCT__ "QEPMonitor"

/*

   Runs the user provided monitor routines, if any.

*/

PetscErrorCode QEPMonitor(QEP qep,PetscInt it,PetscInt nconv,PetscScalar *eigr,PetscScalar *eigi,PetscReal *errest,PetscInt nest)

{

  PetscErrorCode ierr;

  PetscInt       i,n = qep->numbermonitors;

  PetscFunctionBegin;

  for (i=0;i<n;i++) {

    ierr = (*qep->monitor[i])(qep,it,nconv,eigr,eigi,errest,nest,qep->monitorcontext[i]);CHKERRQ(ierr);

  }

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "QEPMonitorSet"

/*@C

   QEPMonitorSet - Sets an ADDITIONAL function to be called at every

   iteration to monitor the error estimates for each requested eigenpair.

   Logically Collective on QEP

   Input Parameters:

+  qep     - eigensolver context obtained from QEPCreate()

.  monitor - pointer to function (if this is PETSC_NULL, it turns off monitoring)

.  mctx    - [optional] context for private data for the

             monitor routine (use PETSC_NULL if no context is desired)

-  monitordestroy - [optional] routine that frees monitor context

          (may be PETSC_NULL)

   Calling Sequence of monitor:

$     monitor (QEP qep, int its, int nconv, PetscScalar *eigr, PetscScalar *eigi, PetscReal* errest, int nest, void *mctx)

+  qep    - quadratic eigensolver context obtained from QEPCreate()

.  its    - iteration number

.  nconv  - number of converged eigenpairs

.  eigr   - real part of the eigenvalues

.  eigi   - imaginary part of the eigenvalues

.  errest - relative error estimates for each eigenpair

.  nest   - number of error estimates

-  mctx   - optional monitoring context, as set by QEPMonitorSet()

   Options Database Keys:

+    -qep_monitor          - print only the first error estimate

.    -qep_monitor_all      - print error estimates at each iteration

.    -qep_monitor_conv     - print the eigenvalue approximations only when

      convergence has been reached

.    -qep_monitor_draw     - sets line graph monitor for the first unconverged

      approximate eigenvalue

.    -qep_monitor_draw_all - sets line graph monitor for all unconverged

      approximate eigenvalue

-    -qep_monitor_cancel   - cancels all monitors that have been hardwired into

      a code by calls to QEPMonitorSet(), but does not cancel those set via

      the options database.

   Notes:  

   Several different monitoring routines may be set by calling

   QEPMonitorSet() multiple times; all will be called in the

   order in which they were set.

   Level: intermediate

.seealso: QEPMonitorFirst(), QEPMonitorAll(), QEPMonitorCancel()

@*/

PetscErrorCode QEPMonitorSet(QEP qep,PetscErrorCode (*monitor)(QEP,PetscInt,PetscInt,PetscScalar*,PetscScalar*,PetscReal*,PetscInt,void*),void *mctx,PetscErrorCode (*monitordestroy)(void**))

{

  PetscFunctionBegin;

  PetscValidHeaderSpecific(qep,QEP_CLASSID,1);

  if (qep->numbermonitors >= MAXQEPMONITORS) {

    SETERRQ(((PetscObject)qep)->comm,PETSC_ERR_ARG_OUTOFRANGE,"Too many QEP monitors set");

  }

  qep->monitor[qep->numbermonitors]           = monitor;

  qep->monitorcontext[qep->numbermonitors]    = (void*)mctx;

  qep->monitordestroy[qep->numbermonitors++]  = monitordestroy;

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "QEPMonitorCancel"

/*@

   QEPMonitorCancel - Clears all monitors for a QEP object.

   Logically Collective on QEP

   Input Parameters:

.  qep - eigensolver context obtained from QEPCreate()

   Options Database Key:

.    -qep_monitor_cancel - Cancels all monitors that have been hardwired

      into a code by calls to QEPMonitorSet(),

      but does not cancel those set via the options database.

   Level: intermediate

.seealso: QEPMonitorSet()

@*/

PetscErrorCode QEPMonitorCancel(QEP qep)

{

  PetscErrorCode ierr;

  PetscInt       i;

  PetscFunctionBegin;

  PetscValidHeaderSpecific(qep,QEP_CLASSID,1);

  for (i=0; i<qep->numbermonitors; i++) {

    if (qep->monitordestroy[i]) {

      ierr = (*qep->monitordestroy[i])(&qep->monitorcontext[i]);CHKERRQ(ierr);

    }

  }

  qep->numbermonitors = 0;

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "QEPGetMonitorContext"

/*@C

   QEPGetMonitorContext - Gets the monitor context, as set by

   QEPMonitorSet() for the FIRST monitor only.

   Not Collective

   Input Parameter:

.  qep - eigensolver context obtained from QEPCreate()

   Output Parameter:

.  ctx - monitor context

   Level: intermediate

.seealso: QEPMonitorSet(), QEPDefaultMonitor()

@*/

PetscErrorCode QEPGetMonitorContext(QEP qep,void **ctx)

{

  PetscFunctionBegin;

  PetscValidHeaderSpecific(qep,QEP_CLASSID,1);

  *ctx =      (qep->monitorcontext[0]);

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "QEPMonitorAll"

/*@C

   QEPMonitorAll - Print the current approximate values and

   error estimates at each iteration of the quadratic eigensolver.

   Collective on QEP

   Input Parameters:

+  qep    - quadratic eigensolver context

.  its    - iteration number

.  nconv  - number of converged eigenpairs so far

.  eigr   - real part of the eigenvalues

.  eigi   - imaginary part of the eigenvalues

.  errest - error estimates

.  nest   - number of error estimates to display

-  dummy  - unused monitor context

   Level: intermediate

.seealso: QEPMonitorSet(), QEPMonitorFirst(), QEPMonitorConverged()

@*/

PetscErrorCode QEPMonitorAll(QEP qep,PetscInt its,PetscInt nconv,PetscScalar *eigr,PetscScalar *eigi,PetscReal *errest,PetscInt nest,void *dummy)

{

  PetscErrorCode ierr;

  PetscInt       i;

  PetscViewer    viewer = dummy? (PetscViewer)dummy: PETSC_VIEWER_STDOUT_(((PetscObject)qep)->comm);

  PetscFunctionBegin;

  if (its) {

    ierr = PetscViewerASCIIAddTab(viewer,((PetscObject)qep)->tablevel);CHKERRQ(ierr);

    ierr = PetscViewerASCIIPrintf(viewer,"%3D QEP nconv=%D Values (Errors)",its,nconv);CHKERRQ(ierr);

    for (i=0;i<nest;i++) {

#if defined(PETSC_USE_COMPLEX)

      ierr = PetscViewerASCIIPrintf(viewer," %G%+Gi",PetscRealPart(eigr[i]),PetscImaginaryPart(eigr[i]));CHKERRQ(ierr);

#else

      ierr = PetscViewerASCIIPrintf(viewer," %G",eigr[i]);CHKERRQ(ierr);

      if (eigi[i]!=0.0) { ierr = PetscViewerASCIIPrintf(viewer,"%+Gi",eigi[i]);CHKERRQ(ierr); }

#endif

      ierr = PetscViewerASCIIPrintf(viewer," (%10.8e)",(double)errest[i]);CHKERRQ(ierr);

    }

    ierr = PetscViewerASCIIPrintf(viewer,"\n");CHKERRQ(ierr);

    ierr = PetscViewerASCIISubtractTab(viewer,((PetscObject)qep)->tablevel);CHKERRQ(ierr);

  }

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "QEPMonitorFirst"

/*@C

   QEPMonitorFirst - Print the first unconverged approximate value and

   error estimate at each iteration of the quadratic eigensolver.

   Collective on QEP

   Input Parameters:

+  qep    - quadratic eigensolver context

.  its    - iteration number

.  nconv  - number of converged eigenpairs so far

.  eigr   - real part of the eigenvalues

.  eigi   - imaginary part of the eigenvalues

.  errest - error estimates

.  nest   - number of error estimates to display

-  dummy  - unused monitor context

   Level: intermediate

.seealso: QEPMonitorSet(), QEPMonitorAll(), QEPMonitorConverged()

@*/

PetscErrorCode QEPMonitorFirst(QEP qep,PetscInt its,PetscInt nconv,PetscScalar *eigr,PetscScalar *eigi,PetscReal *errest,PetscInt nest,void *dummy)

{

  PetscErrorCode ierr;

  PetscViewer    viewer = dummy? (PetscViewer)dummy: PETSC_VIEWER_STDOUT_(((PetscObject)qep)->comm);

  PetscFunctionBegin;

  if (its && nconv<nest) {

    ierr = PetscViewerASCIIAddTab(viewer,((PetscObject)qep)->tablevel);CHKERRQ(ierr);

    ierr = PetscViewerASCIIPrintf(viewer,"%3D QEP nconv=%D first unconverged value (error)",its,nconv);CHKERRQ(ierr);

#if defined(PETSC_USE_COMPLEX)

    ierr = PetscViewerASCIIPrintf(viewer," %G%+Gi",PetscRealPart(eigr[nconv]),PetscImaginaryPart(eigr[nconv]));CHKERRQ(ierr);

#else

    ierr = PetscViewerASCIIPrintf(viewer," %G",eigr[nconv]);CHKERRQ(ierr);

    if (eigi[nconv]!=0.0) { ierr = PetscViewerASCIIPrintf(viewer,"%+Gi",eigi[nconv]);CHKERRQ(ierr); }

#endif

    ierr = PetscViewerASCIIPrintf(viewer," (%10.8e)\n",(double)errest[nconv]);CHKERRQ(ierr);

    ierr = PetscViewerASCIISubtractTab(viewer,((PetscObject)qep)->tablevel);CHKERRQ(ierr);

  }

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "QEPMonitorConverged"

/*@C

   QEPMonitorConverged - Print the approximate values and

   error estimates as they converge.

   Collective on QEP

   Input Parameters:

+  qep    - quadratic eigensolver context

.  its    - iteration number

.  nconv  - number of converged eigenpairs so far

.  eigr   - real part of the eigenvalues

.  eigi   - imaginary part of the eigenvalues

.  errest - error estimates

.  nest   - number of error estimates to display

-  dummy  - unused monitor context

   Level: intermediate

.seealso: QEPMonitorSet(), QEPMonitorFirst(), QEPMonitorAll()

@*/

PetscErrorCode QEPMonitorConverged(QEP qep,PetscInt its,PetscInt nconv,PetscScalar *eigr,PetscScalar *eigi,PetscReal *errest,PetscInt nest,void *dummy)

{

  PetscErrorCode   ierr;

  PetscInt         i;

  SlepcConvMonitor ctx = (SlepcConvMonitor)dummy;

  PetscFunctionBegin;

  if (!its) {

    ctx->oldnconv = 0;

  } else {

    for (i=ctx->oldnconv;i<nconv;i++) {

      ierr = PetscViewerASCIIAddTab(ctx->viewer,((PetscObject)qep)->tablevel);CHKERRQ(ierr);

      ierr = PetscViewerASCIIPrintf(ctx->viewer,"%3D QEP converged value (error) #%D",its,i);CHKERRQ(ierr);

#if defined(PETSC_USE_COMPLEX)

      ierr = PetscViewerASCIIPrintf(ctx->viewer," %G%+Gi",PetscRealPart(eigr[i]),PetscImaginaryPart(eigr[i]));CHKERRQ(ierr);

#else

      ierr = PetscViewerASCIIPrintf(ctx->viewer," %G",eigr[i]);CHKERRQ(ierr);

      if (eigi[i]!=0.0) { ierr = PetscViewerASCIIPrintf(ctx->viewer,"%+Gi",eigi[i]);CHKERRQ(ierr); }

#endif

      ierr = PetscViewerASCIIPrintf(ctx->viewer," (%10.8e)\n",(double)errest[i]);CHKERRQ(ierr);

      ierr = PetscViewerASCIISubtractTab(ctx->viewer,((PetscObject)qep)->tablevel);CHKERRQ(ierr);

    }

    ctx->oldnconv = nconv;

  }

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "QEPMonitorLG"

PetscErrorCode QEPMonitorLG(QEP qep,PetscInt its,PetscInt nconv,PetscScalar *eigr,PetscScalar *eigi,PetscReal *errest,PetscInt nest,void *monctx)

{

  PetscViewer    viewer = (PetscViewer) monctx;

  PetscDraw      draw;

  PetscDrawLG    lg;

  PetscErrorCode ierr;

  PetscReal      x,y;

  PetscFunctionBegin;

  if (!viewer) { viewer = PETSC_VIEWER_DRAW_(((PetscObject)qep)->comm); }

  ierr = PetscViewerDrawGetDraw(viewer,0,&draw);CHKERRQ(ierr);

  ierr = PetscViewerDrawGetDrawLG(viewer,0,&lg);CHKERRQ(ierr);

  if (!its) {

    ierr = PetscDrawSetTitle(draw,"Error estimates");CHKERRQ(ierr);

    ierr = PetscDrawSetDoubleBuffer(draw);CHKERRQ(ierr);

    ierr = PetscDrawLGSetDimension(lg,1);CHKERRQ(ierr);

    ierr = PetscDrawLGReset(lg);CHKERRQ(ierr);

    ierr = PetscDrawLGSetLimits(lg,0,1.0,log10(qep->tol)-2,0.0);CHKERRQ(ierr);

  }

  x = (PetscReal) its;

  if (errest[nconv] > 0.0) y = log10(errest[nconv]); else y = 0.0;

  ierr = PetscDrawLGAddPoint(lg,&x,&y);CHKERRQ(ierr);

  ierr = PetscDrawLGDraw(lg);CHKERRQ(ierr);

  PetscFunctionReturn(0);

}

#undef __FUNCT__  

#define __FUNCT__ "QEPMonitorLGAll"

PetscErrorCode QEPMonitorLGAll(QEP qep,PetscInt its,PetscInt nconv,PetscScalar *eigr,PetscScalar *eigi,PetscReal *errest,PetscInt nest,void *monctx)

{

  PetscViewer    viewer = (PetscViewer) monctx;

  PetscDraw      draw;

  PetscDrawLG    lg;

  PetscErrorCode ierr;

  PetscReal      *x,*y;

  PetscInt       i,n = PetscMin(qep->nev,255);

  PetscFunctionBegin;

  if (!viewer) { viewer = PETSC_VIEWER_DRAW_(((PetscObject)qep)->comm); }

  ierr = PetscViewerDrawGetDraw(viewer,0,&draw);CHKERRQ(ierr);

  ierr = PetscViewerDrawGetDrawLG(viewer,0,&lg);CHKERRQ(ierr);

  if (!its) {

    ierr = PetscDrawSetTitle(draw,"Error estimates");CHKERRQ(ierr);

    ierr = PetscDrawSetDoubleBuffer(draw);CHKERRQ(ierr);

    ierr = PetscDrawLGSetDimension(lg,n);CHKERRQ(ierr);

    ierr = PetscDrawLGReset(lg);CHKERRQ(ierr);

    ierr = PetscDrawLGSetLimits(lg,0,1.0,log10(qep->tol)-2,0.0);CHKERRQ(ierr);

  }

  ierr = PetscMalloc(sizeof(PetscReal)*n,&x);CHKERRQ(ierr);

  ierr = PetscMalloc(sizeof(PetscReal)*n,&y);CHKERRQ(ierr);

  for (i=0;i<n;i++) {

    x[i] = (PetscReal) its;

    if (i < nest && errest[i] > 0.0) y[i] = log10(errest[i]);

    else y[i] = 0.0;

  }

  ierr = PetscDrawLGAddPoint(lg,x,y);CHKERRQ(ierr);

  ierr = PetscDrawLGDraw(lg);CHKERRQ(ierr);

  ierr = PetscFree(x);CHKERRQ(ierr);

  ierr = PetscFree(y);CHKERRQ(ierr);  

  PetscFunctionReturn(0);

}