Date: 2026-05-01T10:02:28+00:00

Actual source code: epsmon.c

      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain

      6:    This file is part of SLEPc.
      7:    SLEPc is distributed under a 2-clause BSD license (see LICENSE).
      8:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      9: */
     10: /*
     11:    EPS routines related to monitors
     12: */

     14: #include <slepc/private/epsimpl.h>
     15: #include <petscdraw.h>

     17: /*
     18:    Runs the user provided monitor routines, if any.
     19: */
     20: PetscErrorCode EPSMonitor(EPS eps,PetscInt it,PetscInt nconv,PetscScalar *eigr,PetscScalar *eigi,PetscReal *errest,PetscInt nest)
     21: {
     22:   PetscInt       i,n = eps->numbermonitors;

     24:   PetscFunctionBegin;
     25:   for (i=0;i<n;i++) PetscCall((*eps->monitor[i])(eps,it,nconv,eigr,eigi,errest,nest,eps->monitorcontext[i]));
     26:   PetscFunctionReturn(PETSC_SUCCESS);
     27: }

     29: /*@C
     30:    EPSMonitorSet - Sets an ADDITIONAL function to be called at every
     31:    iteration to monitor the error estimates for each requested eigenpair.

     33:    Logically Collective

     35:    Input Parameters:
     36: +  eps            - the linear eigensolver context
     37: .  monitor        - pointer to function (if this is `NULL`, it turns off monitoring),
     38:                     see `EPSMonitorFn`
     39: .  ctx            - [optional] context for private data for the monitor routine
     40:                     (use `NULL` if no context is desired)
     41: -  monitordestroy - [optional] routine that frees monitor context (may be `NULL`),
     42:                     see `PetscCtxDestroyFn` for the calling sequence

     44:    Options Database Keys:
     45: +  -eps_monitor                    - print only the first error estimate
     46: .  -eps_monitor_all                - print error estimates at each iteration
     47: .  -eps_monitor_conv               - print the eigenvalue approximations only when
     48:                                      convergence has been reached
     49: .  -eps_monitor draw::draw_lg      - sets line graph monitor for the first unconverged
     50:                                      approximate eigenvalue
     51: .  -eps_monitor_all draw::draw_lg  - sets line graph monitor for all unconverged
     52:                                      approximate eigenvalues
     53: .  -eps_monitor_conv draw::draw_lg - sets line graph monitor for convergence history
     54: -  -eps_monitor_cancel             - cancels all monitors that have been hardwired into
     55:                                      a code by calls to `EPSMonitorSet()`, but does not cancel
     56:                                      those set via the options database.

     58:    Notes:
     59:    The options database option `-eps_monitor` and related options are the easiest way
     60:    to turn on `EPS` iteration monitoring.

     62:    `EPSMonitorRegister()` provides a way to associate an options database key with `EPS`
     63:    monitor function.

     65:    Several different monitoring routines may be set by calling `EPSMonitorSet()` multiple
     66:    times; all will be called in the order in which they were set.

     68:    Fortran Note:
     69:    Only a single monitor function can be set for each `EPS` object.

     71:    Level: intermediate

     73: .seealso: [](ch:eps), `EPSMonitorFirst()`, `EPSMonitorAll()`, `EPSMonitorConverged()`, `EPSMonitorFirstDrawLG()`, `EPSMonitorAllDrawLG()`, `EPSMonitorConvergedDrawLG()`, `EPSMonitorCancel()`
     74: @*/
     75: PetscErrorCode EPSMonitorSet(EPS eps,EPSMonitorFn *monitor,PetscCtx ctx,PetscCtxDestroyFn *monitordestroy)
     76: {
     77:   PetscInt  i;
     78:   PetscBool identical;

     80:   PetscFunctionBegin;
     82:   for (i=0;i<eps->numbermonitors;i++) {
     83:     PetscCall(PetscMonitorCompare((PetscErrorCode(*)(void))(PetscVoidFn*)monitor,ctx,monitordestroy,(PetscErrorCode (*)(void))(PetscVoidFn*)eps->monitor[i],eps->monitorcontext[i],eps->monitordestroy[i],&identical));
     84:     if (identical) PetscFunctionReturn(PETSC_SUCCESS);
     85:   }
     86:   PetscCheck(eps->numbermonitors<MAXEPSMONITORS,PetscObjectComm((PetscObject)eps),PETSC_ERR_ARG_OUTOFRANGE,"Too many EPS monitors set");
     87:   eps->monitor[eps->numbermonitors]           = monitor;
     88:   eps->monitorcontext[eps->numbermonitors]    = ctx;
     89:   eps->monitordestroy[eps->numbermonitors++]  = monitordestroy;
     90:   PetscFunctionReturn(PETSC_SUCCESS);
     91: }

     93: /*@
     94:    EPSMonitorCancel - Clears all monitors for an `EPS` object.

     96:    Logically Collective

     98:    Input Parameter:
     99: .  eps - the linear eigensolver context

    101:    Options Database Key:
    102: .  -eps_monitor_cancel - cancels all monitors that have been hardwired into a code by calls to
    103:                          `EPSMonitorSet()`, but does not cancel those set via the options database.

    105:    Level: intermediate

    107: .seealso: [](ch:eps), `EPSMonitorSet()`
    108: @*/
    109: PetscErrorCode EPSMonitorCancel(EPS eps)
    110: {
    111:   PetscInt       i;

    113:   PetscFunctionBegin;
    115:   for (i=0; i<eps->numbermonitors; i++) {
    116:     if (eps->monitordestroy[i]) PetscCall((*eps->monitordestroy[i])(&eps->monitorcontext[i]));
    117:   }
    118:   eps->numbermonitors = 0;
    119:   PetscFunctionReturn(PETSC_SUCCESS);
    120: }

    122: /*@C
    123:    EPSGetMonitorContext - Gets the monitor context, as set by
    124:    `EPSMonitorSet()` for the FIRST monitor only.

    126:    Not Collective

    128:    Input Parameter:
    129: .  eps - the linear eigensolver context

    131:    Output Parameter:
    132: .  ctx - monitor context

    134:    Level: intermediate

    136: .seealso: [](ch:eps), `EPSMonitorSet()`
    137: @*/
    138: PetscErrorCode EPSGetMonitorContext(EPS eps,PetscCtxRt ctx)
    139: {
    140:   PetscFunctionBegin;
    142:   *(void**)ctx = eps->monitorcontext[0];
    143:   PetscFunctionReturn(PETSC_SUCCESS);
    144: }

    146: static inline PetscErrorCode EPSMonitorPrintEval(EPS eps,PetscViewer viewer,PetscScalar er,PetscScalar ei)
    147: {
    148:   PetscFunctionBegin;
    149:   if (eps->problem_type==EPS_HEP || eps->problem_type==EPS_GHEP || eps->problem_type==EPS_BSE) PetscCall(PetscViewerASCIIPrintf(viewer," %g",(double)PetscRealPart(er)));
    150:   else {
    151: #if defined(PETSC_USE_COMPLEX)
    152:     PetscCall(PetscViewerASCIIPrintf(viewer," %g%+gi",(double)PetscRealPart(er),(double)PetscImaginaryPart(er)));
    153: #else
    154:     PetscCall(PetscViewerASCIIPrintf(viewer," %g",(double)er));
    155:     if (ei!=0.0) PetscCall(PetscViewerASCIIPrintf(viewer,"%+gi",(double)ei));
    156: #endif
    157:   }
    158:   PetscFunctionReturn(PETSC_SUCCESS);
    159: }

    161: /*@C
    162:    EPSMonitorFirst - Print the first unconverged approximate value and
    163:    error estimate at each iteration of the eigensolver.

    165:    Collective

    167:    Input Parameters:
    168: +  eps    - the linear eigensolver context
    169: .  its    - iteration number
    170: .  nconv  - number of converged eigenpairs so far
    171: .  eigr   - real part of the eigenvalues
    172: .  eigi   - imaginary part of the eigenvalues
    173: .  errest - error estimates
    174: .  nest   - number of error estimates to display
    175: -  vf     - viewer and format for monitoring

    177:    Options Database Key:
    178: .  -eps_monitor - activates `EPSMonitorFirst()`

    180:    Note:
    181:    This is not called directly by users, rather one calls `EPSMonitorSet()`, with this
    182:    function as an argument, to cause the monitor to be used during the `EPS` solve.

    184:    Level: intermediate

    186: .seealso: [](ch:eps), `EPSMonitorSet()`, `EPSMonitorAll()`, `EPSMonitorConverged()`
    187: @*/
    188: PetscErrorCode EPSMonitorFirst(EPS eps,PetscInt its,PetscInt nconv,PetscScalar eigr[],PetscScalar eigi[],PetscReal errest[],PetscInt nest,PetscViewerAndFormat *vf)
    189: {
    190:   PetscScalar    er,ei;
    191:   PetscViewer    viewer = vf->viewer;

    193:   PetscFunctionBegin;
    196:   if (its==1 && ((PetscObject)eps)->prefix) PetscCall(PetscViewerASCIIPrintf(viewer,"  Eigenvalue approximations and residual norms for %s solve.\n",((PetscObject)eps)->prefix));
    197:   if (nconv<nest) {
    198:     PetscCall(PetscViewerPushFormat(viewer,vf->format));
    199:     PetscCall(PetscViewerASCIIAddTab(viewer,((PetscObject)eps)->tablevel));
    200:     PetscCall(PetscViewerASCIIPrintf(viewer,"%3" PetscInt_FMT " EPS nconv=%" PetscInt_FMT " first unconverged value (error)",its,nconv));
    201:     PetscCall(PetscViewerASCIIUseTabs(viewer,PETSC_FALSE));
    202:     er = eigr[nconv]; ei = eigi[nconv];
    203:     PetscCall(STBackTransform(eps->st,1,&er,&ei));
    204:     PetscCall(EPSMonitorPrintEval(eps,viewer,er,ei));
    205:     PetscCall(PetscViewerASCIIPrintf(viewer," (%10.8e)\n",(double)errest[nconv]));
    206:     PetscCall(PetscViewerASCIIUseTabs(viewer,PETSC_TRUE));
    207:     PetscCall(PetscViewerASCIISubtractTab(viewer,((PetscObject)eps)->tablevel));
    208:     PetscCall(PetscViewerPopFormat(viewer));
    209:   }
    210:   PetscFunctionReturn(PETSC_SUCCESS);
    211: }

    213: /*@C
    214:    EPSMonitorAll - Print the current approximate values and
    215:    error estimates at each iteration of the eigensolver.

    217:    Collective

    219:    Input Parameters:
    220: +  eps    - the linear eigensolver context
    221: .  its    - iteration number
    222: .  nconv  - number of converged eigenpairs so far
    223: .  eigr   - real part of the eigenvalues
    224: .  eigi   - imaginary part of the eigenvalues
    225: .  errest - error estimates
    226: .  nest   - number of error estimates to display
    227: -  vf     - viewer and format for monitoring

    229:    Options Database Key:
    230: .  -eps_monitor_all - activates `EPSMonitorAll()`

    232:    Note:
    233:    This is not called directly by users, rather one calls `EPSMonitorSet()`, with this
    234:    function as an argument, to cause the monitor to be used during the `EPS` solve.

    236:    Level: intermediate

    238: .seealso: [](ch:eps), `EPSMonitorSet()`, `EPSMonitorFirst()`, `EPSMonitorConverged()`
    239: @*/
    240: PetscErrorCode EPSMonitorAll(EPS eps,PetscInt its,PetscInt nconv,PetscScalar eigr[],PetscScalar eigi[],PetscReal errest[],PetscInt nest,PetscViewerAndFormat *vf)
    241: {
    242:   PetscInt       i;
    243:   PetscScalar    er,ei;
    244:   PetscViewer    viewer = vf->viewer;

    246:   PetscFunctionBegin;
    249:   PetscCall(PetscViewerPushFormat(viewer,vf->format));
    250:   PetscCall(PetscViewerASCIIAddTab(viewer,((PetscObject)eps)->tablevel));
    251:   if (its==1 && ((PetscObject)eps)->prefix) PetscCall(PetscViewerASCIIPrintf(viewer,"  Eigenvalue approximations and residual norms for %s solve.\n",((PetscObject)eps)->prefix));
    252:   PetscCall(PetscViewerASCIIPrintf(viewer,"%3" PetscInt_FMT " EPS nconv=%" PetscInt_FMT " Values (Errors)",its,nconv));
    253:   PetscCall(PetscViewerASCIIUseTabs(viewer,PETSC_FALSE));
    254:   for (i=0;i<nest;i++) {
    255:     er = eigr[i]; ei = eigi[i];
    256:     PetscCall(STBackTransform(eps->st,1,&er,&ei));
    257:     PetscCall(EPSMonitorPrintEval(eps,viewer,er,ei));
    258:     PetscCall(PetscViewerASCIIPrintf(viewer," (%10.8e)",(double)errest[i]));
    259:   }
    260:   PetscCall(PetscViewerASCIIPrintf(viewer,"\n"));
    261:   PetscCall(PetscViewerASCIIUseTabs(viewer,PETSC_TRUE));
    262:   PetscCall(PetscViewerASCIISubtractTab(viewer,((PetscObject)eps)->tablevel));
    263:   PetscCall(PetscViewerPopFormat(viewer));
    264:   PetscFunctionReturn(PETSC_SUCCESS);
    265: }

    267: /*@C
    268:    EPSMonitorConverged - Print the approximate values and
    269:    error estimates as they converge.

    271:    Collective

    273:    Input Parameters:
    274: +  eps    - the linear eigensolver context
    275: .  its    - iteration number
    276: .  nconv  - number of converged eigenpairs so far
    277: .  eigr   - real part of the eigenvalues
    278: .  eigi   - imaginary part of the eigenvalues
    279: .  errest - error estimates
    280: .  nest   - number of error estimates to display
    281: -  vf     - viewer and format for monitoring

    283:    Options Database Key:
    284: .  -eps_monitor_conv - activates `EPSMonitorConverged()`

    286:    Notes:
    287:    This is not called directly by users, rather one calls `EPSMonitorSet()`, with this
    288:    function as an argument, to cause the monitor to be used during the `EPS` solve.

    290:    Call `EPSMonitorConvergedCreate()` to create the context used with this monitor.

    292:    Level: intermediate

    294: .seealso: [](ch:eps), `EPSMonitorSet()`, `EPSMonitorConvergedCreate()`, `EPSMonitorFirst()`, `EPSMonitorAll()`
    295: @*/
    296: PetscErrorCode EPSMonitorConverged(EPS eps,PetscInt its,PetscInt nconv,PetscScalar eigr[],PetscScalar eigi[],PetscReal errest[],PetscInt nest,PetscViewerAndFormat *vf)
    297: {
    298:   PetscInt       i,*oldnconv;
    299:   PetscScalar    er,ei;
    300:   PetscViewer    viewer = vf->viewer;

    302:   PetscFunctionBegin;
    305:   oldnconv = (PetscInt*)vf->data;
    306:   if (its==1 && ((PetscObject)eps)->prefix) PetscCall(PetscViewerASCIIPrintf(viewer,"  Convergence history for %s solve.\n",((PetscObject)eps)->prefix));
    307:   if (its==1) *oldnconv = 0;
    308:   if (*oldnconv!=nconv) {
    309:     PetscCall(PetscViewerPushFormat(viewer,vf->format));
    310:     PetscCall(PetscViewerASCIIAddTab(viewer,((PetscObject)eps)->tablevel));
    311:     for (i=*oldnconv;i<nconv;i++) {
    312:       PetscCall(PetscViewerASCIIPrintf(viewer,"%3" PetscInt_FMT " EPS converged value (error) #%" PetscInt_FMT,its,i));
    313:       PetscCall(PetscViewerASCIIUseTabs(viewer,PETSC_FALSE));
    314:       er = eigr[i]; ei = eigi[i];
    315:       PetscCall(STBackTransform(eps->st,1,&er,&ei));
    316:       PetscCall(EPSMonitorPrintEval(eps,viewer,er,ei));
    317:       PetscCall(PetscViewerASCIIPrintf(viewer," (%10.8e)\n",(double)errest[i]));
    318:       PetscCall(PetscViewerASCIIUseTabs(viewer,PETSC_TRUE));
    319:     }
    320:     PetscCall(PetscViewerASCIISubtractTab(viewer,((PetscObject)eps)->tablevel));
    321:     PetscCall(PetscViewerPopFormat(viewer));
    322:     *oldnconv = nconv;
    323:   }
    324:   PetscFunctionReturn(PETSC_SUCCESS);
    325: }

    327: /*@C
    328:    EPSMonitorConvergedCreate - Creates the context for the convergence history monitor.

    330:    Collective

    332:    Input Parameters:
    333: +  viewer - the viewer
    334: .  format - the viewer format
    335: -  ctx    - an optional user context

    337:    Output Parameter:
    338: .  vf     - the viewer and format context

    340:    Level: intermediate

    342: .seealso: [](ch:eps), `EPSMonitorSet()`
    343: @*/
    344: PetscErrorCode EPSMonitorConvergedCreate(PetscViewer viewer,PetscViewerFormat format,PetscCtx ctx,PetscViewerAndFormat **vf)
    345: {
    346:   PetscInt *oldnconv;

    348:   PetscFunctionBegin;
    349:   PetscCall(PetscViewerAndFormatCreate(viewer,format,vf));
    350:   PetscCall(PetscNew(&oldnconv));
    351:   (*vf)->data = (void*)oldnconv;
    352:   (*vf)->data_destroy = PetscCtxDestroyDefault;
    353:   PetscFunctionReturn(PETSC_SUCCESS);
    354: }

    356: /*@C
    357:    EPSMonitorFirstDrawLG - Plots the error estimate of the first unconverged
    358:    approximation at each iteration of the eigensolver.

    360:    Collective

    362:    Input Parameters:
    363: +  eps    - the linear eigensolver context
    364: .  its    - iteration number
    365: .  nconv  - number of converged eigenpairs so far
    366: .  eigr   - real part of the eigenvalues
    367: .  eigi   - imaginary part of the eigenvalues
    368: .  errest - error estimates
    369: .  nest   - number of error estimates to display
    370: -  vf     - viewer and format for monitoring

    372:    Options Database Key:
    373: .  -eps_monitor draw::draw_lg - activates `EPSMonitorFirstDrawLG()`

    375:    Notes:
    376:    This is not called directly by users, rather one calls `EPSMonitorSet()`, with this
    377:    function as an argument, to cause the monitor to be used during the `EPS` solve.

    379:    Call `EPSMonitorFirstDrawLGCreate()` to create the context used with this monitor.

    381:    Level: intermediate

    383: .seealso: [](ch:eps), `EPSMonitorSet()`, `EPSMonitorFirstDrawLGCreate()`
    384: @*/
    385: PetscErrorCode EPSMonitorFirstDrawLG(EPS eps,PetscInt its,PetscInt nconv,PetscScalar eigr[],PetscScalar eigi[],PetscReal errest[],PetscInt nest,PetscViewerAndFormat *vf)
    386: {
    387:   PetscViewer    viewer = vf->viewer;
    388:   PetscDrawLG    lg;
    389:   PetscReal      x,y;

    391:   PetscFunctionBegin;
    394:   PetscCall(PetscViewerPushFormat(viewer,vf->format));
    395:   PetscCall(PetscViewerDrawGetDrawLG(viewer,0,&lg));
    396:   if (its==1) {
    397:     PetscCall(PetscDrawLGReset(lg));
    398:     PetscCall(PetscDrawLGSetDimension(lg,1));
    399:     PetscCall(PetscDrawLGSetLimits(lg,1,1,PetscLog10Real(eps->tol)-2,0.0));
    400:   }
    401:   if (nconv<nest) {
    402:     x = (PetscReal)its;
    403:     if (errest[nconv] > 0.0) y = PetscLog10Real(errest[nconv]);
    404:     else y = 0.0;
    405:     PetscCall(PetscDrawLGAddPoint(lg,&x,&y));
    406:     if (its <= 20 || !(its % 5) || eps->reason) {
    407:       PetscCall(PetscDrawLGDraw(lg));
    408:       PetscCall(PetscDrawLGSave(lg));
    409:     }
    410:   }
    411:   PetscCall(PetscViewerPopFormat(viewer));
    412:   PetscFunctionReturn(PETSC_SUCCESS);
    413: }

    415: /*@C
    416:    EPSMonitorFirstDrawLGCreate - Creates the plotter for the first error estimate.

    418:    Collective

    420:    Input Parameters:
    421: +  viewer - the viewer
    422: .  format - the viewer format
    423: -  ctx    - an optional user context

    425:    Output Parameter:
    426: .  vf     - the viewer and format context

    428:    Level: intermediate

    430: .seealso: [](ch:eps), `EPSMonitorSet()`
    431: @*/
    432: PetscErrorCode EPSMonitorFirstDrawLGCreate(PetscViewer viewer,PetscViewerFormat format,void *ctx,PetscViewerAndFormat **vf)
    433: {
    434:   PetscFunctionBegin;
    435:   PetscCall(PetscViewerAndFormatCreate(viewer,format,vf));
    436:   (*vf)->data = ctx;
    437:   PetscCall(PetscViewerMonitorLGSetUp(viewer,NULL,"First Error Estimate","Log Error Estimate",1,NULL,PETSC_DECIDE,PETSC_DECIDE,400,300));
    438:   PetscFunctionReturn(PETSC_SUCCESS);
    439: }

    441: /*@C
    442:    EPSMonitorAllDrawLG - Plots the error estimate of all unconverged
    443:    approximations at each iteration of the eigensolver.

    445:    Collective

    447:    Input Parameters:
    448: +  eps    - the linear eigensolver context
    449: .  its    - iteration number
    450: .  nconv  - number of converged eigenpairs so far
    451: .  eigr   - real part of the eigenvalues
    452: .  eigi   - imaginary part of the eigenvalues
    453: .  errest - error estimates
    454: .  nest   - number of error estimates to display
    455: -  vf     - viewer and format for monitoring

    457:    Options Database Key:
    458: .  -eps_monitor_all draw::draw_lg - activates `EPSMonitorAllDrawLG()`

    460:    Notes:
    461:    This is not called directly by users, rather one calls `EPSMonitorSet()`, with this
    462:    function as an argument, to cause the monitor to be used during the `EPS` solve.

    464:    Call `EPSMonitorAllDrawLGCreate()` to create the context used with this monitor.

    466:    Level: intermediate

    468: .seealso: [](ch:eps), `EPSMonitorSet()`, `EPSMonitorAllDrawLGCreate()`
    469: @*/
    470: PetscErrorCode EPSMonitorAllDrawLG(EPS eps,PetscInt its,PetscInt nconv,PetscScalar eigr[],PetscScalar eigi[],PetscReal errest[],PetscInt nest,PetscViewerAndFormat *vf)
    471: {
    472:   PetscViewer    viewer = vf->viewer;
    473:   PetscDrawLG    lg;
    474:   PetscInt       i,n = PetscMin(eps->nev,255);
    475:   PetscReal      *x,*y;

    477:   PetscFunctionBegin;
    480:   PetscCall(PetscViewerPushFormat(viewer,vf->format));
    481:   PetscCall(PetscViewerDrawGetDrawLG(viewer,0,&lg));
    482:   if (its==1) {
    483:     PetscCall(PetscDrawLGReset(lg));
    484:     PetscCall(PetscDrawLGSetDimension(lg,n));
    485:     PetscCall(PetscDrawLGSetLimits(lg,1,1,PetscLog10Real(eps->tol)-2,0.0));
    486:   }
    487:   PetscCall(PetscMalloc2(n,&x,n,&y));
    488:   for (i=0;i<n;i++) {
    489:     x[i] = (PetscReal)its;
    490:     if (i < nest && errest[i] > 0.0) y[i] = PetscLog10Real(errest[i]);
    491:     else y[i] = 0.0;
    492:   }
    493:   PetscCall(PetscDrawLGAddPoint(lg,x,y));
    494:   if (its <= 20 || !(its % 5) || eps->reason) {
    495:     PetscCall(PetscDrawLGDraw(lg));
    496:     PetscCall(PetscDrawLGSave(lg));
    497:   }
    498:   PetscCall(PetscFree2(x,y));
    499:   PetscCall(PetscViewerPopFormat(viewer));
    500:   PetscFunctionReturn(PETSC_SUCCESS);
    501: }

    503: /*@C
    504:    EPSMonitorAllDrawLGCreate - Creates the plotter for all the error estimates.

    506:    Collective

    508:    Input Parameters:
    509: +  viewer - the viewer
    510: .  format - the viewer format
    511: -  ctx    - an optional user context

    513:    Output Parameter:
    514: .  vf     - the viewer and format context

    516:    Level: intermediate

    518: .seealso: [](ch:eps), `EPSMonitorSet()`
    519: @*/
    520: PetscErrorCode EPSMonitorAllDrawLGCreate(PetscViewer viewer,PetscViewerFormat format,void *ctx,PetscViewerAndFormat **vf)
    521: {
    522:   PetscFunctionBegin;
    523:   PetscCall(PetscViewerAndFormatCreate(viewer,format,vf));
    524:   (*vf)->data = ctx;
    525:   PetscCall(PetscViewerMonitorLGSetUp(viewer,NULL,"All Error Estimates","Log Error Estimate",1,NULL,PETSC_DECIDE,PETSC_DECIDE,400,300));
    526:   PetscFunctionReturn(PETSC_SUCCESS);
    527: }

    529: /*@C
    530:    EPSMonitorConvergedDrawLG - Plots the number of converged eigenvalues
    531:    at each iteration of the eigensolver.

    533:    Collective

    535:    Input Parameters:
    536: +  eps    - the linear eigensolver context
    537: .  its    - iteration number
    538: .  nconv  - number of converged eigenpairs so far
    539: .  eigr   - real part of the eigenvalues
    540: .  eigi   - imaginary part of the eigenvalues
    541: .  errest - error estimates
    542: .  nest   - number of error estimates to display
    543: -  vf     - viewer and format for monitoring

    545:    Options Database Key:
    546: .  -eps_monitor_conv draw::draw_lg - activates `EPSMonitorConvergedDrawLG()`

    548:    Notes:
    549:    This is not called directly by users, rather one calls `EPSMonitorSet()`, with this
    550:    function as an argument, to cause the monitor to be used during the `EPS` solve.

    552:    Call `EPSMonitorConvergedDrawLGCreate()` to create the context used with this monitor.

    554:    Level: intermediate

    556: .seealso: [](ch:eps), `EPSMonitorSet()`, `EPSMonitorConvergedDrawLGCreate()`
    557: @*/
    558: PetscErrorCode EPSMonitorConvergedDrawLG(EPS eps,PetscInt its,PetscInt nconv,PetscScalar eigr[],PetscScalar eigi[],PetscReal errest[],PetscInt nest,PetscViewerAndFormat *vf)
    559: {
    560:   PetscViewer      viewer = vf->viewer;
    561:   PetscDrawLG      lg;
    562:   PetscReal        x,y;

    564:   PetscFunctionBegin;
    567:   PetscCall(PetscViewerPushFormat(viewer,vf->format));
    568:   PetscCall(PetscViewerDrawGetDrawLG(viewer,0,&lg));
    569:   if (its==1) {
    570:     PetscCall(PetscDrawLGReset(lg));
    571:     PetscCall(PetscDrawLGSetDimension(lg,1));
    572:     PetscCall(PetscDrawLGSetLimits(lg,1,1,0,eps->nev));
    573:   }
    574:   x = (PetscReal)its;
    575:   y = (PetscReal)eps->nconv;
    576:   PetscCall(PetscDrawLGAddPoint(lg,&x,&y));
    577:   if (its <= 20 || !(its % 5) || eps->reason) {
    578:     PetscCall(PetscDrawLGDraw(lg));
    579:     PetscCall(PetscDrawLGSave(lg));
    580:   }
    581:   PetscCall(PetscViewerPopFormat(viewer));
    582:   PetscFunctionReturn(PETSC_SUCCESS);
    583: }

    585: /*@C
    586:    EPSMonitorConvergedDrawLGCreate - Creates the plotter for the convergence history.

    588:    Collective

    590:    Input Parameters:
    591: +  viewer - the viewer
    592: .  format - the viewer format
    593: -  ctx    - an optional user context

    595:    Output Parameter:
    596: .  vf     - the viewer and format context

    598:    Level: intermediate

    600: .seealso: [](ch:eps), `EPSMonitorSet()`
    601: @*/
    602: PetscErrorCode EPSMonitorConvergedDrawLGCreate(PetscViewer viewer,PetscViewerFormat format,void *ctx,PetscViewerAndFormat **vf)
    603: {
    604:   PetscInt *oldnconv;

    606:   PetscFunctionBegin;
    607:   PetscCall(PetscViewerAndFormatCreate(viewer,format,vf));
    608:   PetscCall(PetscNew(&oldnconv));
    609:   (*vf)->data = (void*)oldnconv;
    610:   (*vf)->data_destroy = PetscCtxDestroyDefault;
    611:   PetscCall(PetscViewerMonitorLGSetUp(viewer,NULL,"Convergence History","Number Converged",1,NULL,PETSC_DECIDE,PETSC_DECIDE,400,300));
    612:   PetscFunctionReturn(PETSC_SUCCESS);
    613: }