Date: 2022-10-01T06:40:44+00:00

Actual source code: mfnbasic.c
slepc-3.18.0 2022-10-01
Report Typos and Errors

      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:    Basic MFN routines
     12: */

     14: #include <slepc/private/mfnimpl.h>

     16: /* Logging support */
     17: PetscClassId      MFN_CLASSID = 0;
     18: PetscLogEvent     MFN_SetUp = 0,MFN_Solve = 0;

     20: /* List of registered MFN routines */
     21: PetscFunctionList MFNList = NULL;
     22: PetscBool         MFNRegisterAllCalled = PETSC_FALSE;

     24: /* List of registered MFN monitors */
     25: PetscFunctionList MFNMonitorList              = NULL;
     26: PetscFunctionList MFNMonitorCreateList        = NULL;
     27: PetscFunctionList MFNMonitorDestroyList       = NULL;
     28: PetscBool         MFNMonitorRegisterAllCalled = PETSC_FALSE;

     30: /*@C
     31:    MFNView - Prints the MFN data structure.

     33:    Collective on mfn

     35:    Input Parameters:
     36: +  mfn - the matrix function solver context
     37: -  viewer - optional visualization context

     39:    Options Database Key:
     40: .  -mfn_view -  Calls MFNView() at end of MFNSolve()

     42:    Note:
     43:    The available visualization contexts include
     44: +     PETSC_VIEWER_STDOUT_SELF - standard output (default)
     45: -     PETSC_VIEWER_STDOUT_WORLD - synchronized standard
     46:          output where only the first processor opens
     47:          the file.  All other processors send their
     48:          data to the first processor to print.

     50:    The user can open an alternative visualization context with
     51:    PetscViewerASCIIOpen() - output to a specified file.

     53:    Level: beginner

     55: .seealso: MFNCreate()
     56: @*/
     57: PetscErrorCode MFNView(MFN mfn,PetscViewer viewer)
     58: {
     59:   PetscBool      isascii;

     62:   if (!viewer) PetscViewerASCIIGetStdout(PetscObjectComm((PetscObject)mfn),&viewer);

     66:   PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&isascii);
     67:   if (isascii) {
     68:     PetscObjectPrintClassNamePrefixType((PetscObject)mfn,viewer);
     69:     PetscViewerASCIIPushTab(viewer);
     70:     PetscTryTypeMethod(mfn,view,viewer);
     71:     PetscViewerASCIIPopTab(viewer);
     72:     PetscViewerASCIIPrintf(viewer,"  number of column vectors (ncv): %" PetscInt_FMT "\n",mfn->ncv);
     73:     PetscViewerASCIIPrintf(viewer,"  maximum number of iterations: %" PetscInt_FMT "\n",mfn->max_it);
     74:     PetscViewerASCIIPrintf(viewer,"  tolerance: %g\n",(double)mfn->tol);
     75:   } else PetscTryTypeMethod(mfn,view,viewer);
     76:   PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_INFO);
     77:   if (!mfn->V) MFNGetFN(mfn,&mfn->fn);
     78:   FNView(mfn->fn,viewer);
     79:   if (!mfn->V) MFNGetBV(mfn,&mfn->V);
     80:   BVView(mfn->V,viewer);
     81:   PetscViewerPopFormat(viewer);
     82:   return 0;
     83: }

     85: /*@C
     86:    MFNViewFromOptions - View from options

     88:    Collective on MFN

     90:    Input Parameters:
     91: +  mfn  - the matrix function context
     92: .  obj  - optional object
     93: -  name - command line option

     95:    Level: intermediate

     97: .seealso: MFNView(), MFNCreate()
     98: @*/
     99: PetscErrorCode MFNViewFromOptions(MFN mfn,PetscObject obj,const char name[])
    100: {
    102:   PetscObjectViewFromOptions((PetscObject)mfn,obj,name);
    103:   return 0;
    104: }
    105: /*@C
    106:    MFNConvergedReasonView - Displays the reason an MFN solve converged or diverged.

    108:    Collective on mfn

    110:    Input Parameters:
    111: +  mfn - the matrix function context
    112: -  viewer - the viewer to display the reason

    114:    Options Database Keys:
    115: .  -mfn_converged_reason - print reason for convergence, and number of iterations

    117:    Note:
    118:    To change the format of the output call PetscViewerPushFormat(viewer,format) before
    119:    this call. Use PETSC_VIEWER_DEFAULT for the default, use PETSC_VIEWER_FAILED to only
    120:    display a reason if it fails. The latter can be set in the command line with
    121:    -mfn_converged_reason ::failed

    123:    Level: intermediate

    125: .seealso: MFNSetTolerances(), MFNGetIterationNumber(), MFNConvergedReasonViewFromOptions()
    126: @*/
    127: PetscErrorCode MFNConvergedReasonView(MFN mfn,PetscViewer viewer)
    128: {
    129:   PetscBool         isAscii;
    130:   PetscViewerFormat format;

    132:   if (!viewer) viewer = PETSC_VIEWER_STDOUT_(PetscObjectComm((PetscObject)mfn));
    133:   PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&isAscii);
    134:   if (isAscii) {
    135:     PetscViewerGetFormat(viewer,&format);
    136:     PetscViewerASCIIAddTab(viewer,((PetscObject)mfn)->tablevel);
    137:     if (mfn->reason > 0 && format != PETSC_VIEWER_FAILED) PetscViewerASCIIPrintf(viewer,"%s Matrix function solve converged due to %s; iterations %" PetscInt_FMT "\n",((PetscObject)mfn)->prefix?((PetscObject)mfn)->prefix:"",MFNConvergedReasons[mfn->reason],mfn->its);
    138:     else if (mfn->reason <= 0) PetscViewerASCIIPrintf(viewer,"%s Matrix function solve did not converge due to %s; iterations %" PetscInt_FMT "\n",((PetscObject)mfn)->prefix?((PetscObject)mfn)->prefix:"",MFNConvergedReasons[mfn->reason],mfn->its);
    139:     PetscViewerASCIISubtractTab(viewer,((PetscObject)mfn)->tablevel);
    140:   }
    141:   return 0;
    142: }

    144: /*@
    145:    MFNConvergedReasonViewFromOptions - Processes command line options to determine if/how
    146:    the MFN converged reason is to be viewed.

    148:    Collective on mfn

    150:    Input Parameter:
    151: .  mfn - the matrix function context

    153:    Level: developer

    155: .seealso: MFNConvergedReasonView()
    156: @*/
    157: PetscErrorCode MFNConvergedReasonViewFromOptions(MFN mfn)
    158: {
    159:   PetscViewer       viewer;
    160:   PetscBool         flg;
    161:   static PetscBool  incall = PETSC_FALSE;
    162:   PetscViewerFormat format;

    164:   if (incall) return 0;
    165:   incall = PETSC_TRUE;
    166:   PetscOptionsGetViewer(PetscObjectComm((PetscObject)mfn),((PetscObject)mfn)->options,((PetscObject)mfn)->prefix,"-mfn_converged_reason",&viewer,&format,&flg);
    167:   if (flg) {
    168:     PetscViewerPushFormat(viewer,format);
    169:     MFNConvergedReasonView(mfn,viewer);
    170:     PetscViewerPopFormat(viewer);
    171:     PetscViewerDestroy(&viewer);
    172:   }
    173:   incall = PETSC_FALSE;
    174:   return 0;
    175: }

    177: /*@
    178:    MFNCreate - Creates the default MFN context.

    180:    Collective

    182:    Input Parameter:
    183: .  comm - MPI communicator

    185:    Output Parameter:
    186: .  outmfn - location to put the MFN context

    188:    Note:
    189:    The default MFN type is MFNKRYLOV

    191:    Level: beginner

    193: .seealso: MFNSetUp(), MFNSolve(), MFNDestroy(), MFN
    194: @*/
    195: PetscErrorCode MFNCreate(MPI_Comm comm,MFN *outmfn)
    196: {
    197:   MFN            mfn;

    200:   *outmfn = NULL;
    201:   MFNInitializePackage();
    202:   SlepcHeaderCreate(mfn,MFN_CLASSID,"MFN","Matrix Function","MFN",comm,MFNDestroy,MFNView);

    204:   mfn->A               = NULL;
    205:   mfn->fn              = NULL;
    206:   mfn->max_it          = PETSC_DEFAULT;
    207:   mfn->ncv             = PETSC_DEFAULT;
    208:   mfn->tol             = PETSC_DEFAULT;
    209:   mfn->errorifnotconverged = PETSC_FALSE;

    211:   mfn->numbermonitors  = 0;

    213:   mfn->V               = NULL;
    214:   mfn->nwork           = 0;
    215:   mfn->work            = NULL;
    216:   mfn->data            = NULL;

    218:   mfn->its             = 0;
    219:   mfn->nv              = 0;
    220:   mfn->errest          = 0;
    221:   mfn->setupcalled     = 0;
    222:   mfn->reason          = MFN_CONVERGED_ITERATING;

    224:   *outmfn = mfn;
    225:   return 0;
    226: }

    228: /*@C
    229:    MFNSetType - Selects the particular solver to be used in the MFN object.

    231:    Logically Collective on mfn

    233:    Input Parameters:
    234: +  mfn  - the matrix function context
    235: -  type - a known method

    237:    Options Database Key:
    238: .  -mfn_type <method> - Sets the method; use -help for a list
    239:     of available methods

    241:    Notes:
    242:    See "slepc/include/slepcmfn.h" for available methods. The default
    243:    is MFNKRYLOV

    245:    Normally, it is best to use the MFNSetFromOptions() command and
    246:    then set the MFN type from the options database rather than by using
    247:    this routine.  Using the options database provides the user with
    248:    maximum flexibility in evaluating the different available methods.
    249:    The MFNSetType() routine is provided for those situations where it
    250:    is necessary to set the iterative solver independently of the command
    251:    line or options database.

    253:    Level: intermediate

    255: .seealso: MFNType
    256: @*/
    257: PetscErrorCode MFNSetType(MFN mfn,MFNType type)
    258: {
    259:   PetscErrorCode (*r)(MFN);
    260:   PetscBool      match;

    265:   PetscObjectTypeCompare((PetscObject)mfn,type,&match);
    266:   if (match) return 0;

    268:   PetscFunctionListFind(MFNList,type,&r);

    271:   PetscTryTypeMethod(mfn,destroy);
    272:   PetscMemzero(mfn->ops,sizeof(struct _MFNOps));

    274:   mfn->setupcalled = 0;
    275:   PetscObjectChangeTypeName((PetscObject)mfn,type);
    276:   (*r)(mfn);
    277:   return 0;
    278: }

    280: /*@C
    281:    MFNGetType - Gets the MFN type as a string from the MFN object.

    283:    Not Collective

    285:    Input Parameter:
    286: .  mfn - the matrix function context

    288:    Output Parameter:
    289: .  type - name of MFN method

    291:    Level: intermediate

    293: .seealso: MFNSetType()
    294: @*/
    295: PetscErrorCode MFNGetType(MFN mfn,MFNType *type)
    296: {
    299:   *type = ((PetscObject)mfn)->type_name;
    300:   return 0;
    301: }

    303: /*@C
    304:    MFNRegister - Adds a method to the matrix function solver package.

    306:    Not Collective

    308:    Input Parameters:
    309: +  name - name of a new user-defined solver
    310: -  function - routine to create the solver context

    312:    Notes:
    313:    MFNRegister() may be called multiple times to add several user-defined solvers.

    315:    Sample usage:
    316: .vb
    317:     MFNRegister("my_solver",MySolverCreate);
    318: .ve

    320:    Then, your solver can be chosen with the procedural interface via
    321: $     MFNSetType(mfn,"my_solver")
    322:    or at runtime via the option
    323: $     -mfn_type my_solver

    325:    Level: advanced

    327: .seealso: MFNRegisterAll()
    328: @*/
    329: PetscErrorCode MFNRegister(const char *name,PetscErrorCode (*function)(MFN))
    330: {
    331:   MFNInitializePackage();
    332:   PetscFunctionListAdd(&MFNList,name,function);
    333:   return 0;
    334: }

    336: /*@C
    337:    MFNMonitorRegister - Adds MFN monitor routine.

    339:    Not Collective

    341:    Input Parameters:
    342: +  name    - name of a new monitor routine
    343: .  vtype   - a PetscViewerType for the output
    344: .  format  - a PetscViewerFormat for the output
    345: .  monitor - monitor routine
    346: .  create  - creation routine, or NULL
    347: -  destroy - destruction routine, or NULL

    349:    Notes:
    350:    MFNMonitorRegister() may be called multiple times to add several user-defined monitors.

    352:    Sample usage:
    353: .vb
    354:    MFNMonitorRegister("my_monitor",PETSCVIEWERASCII,PETSC_VIEWER_ASCII_INFO_DETAIL,MyMonitor,NULL,NULL);
    355: .ve

    357:    Then, your monitor can be chosen with the procedural interface via
    358: $      MFNMonitorSetFromOptions(mfn,"-mfn_monitor_my_monitor","my_monitor",NULL)
    359:    or at runtime via the option
    360: $      -mfn_monitor_my_monitor

    362:    Level: advanced

    364: .seealso: MFNMonitorRegisterAll()
    365: @*/
    366: PetscErrorCode MFNMonitorRegister(const char name[],PetscViewerType vtype,PetscViewerFormat format,PetscErrorCode (*monitor)(MFN,PetscInt,PetscReal,PetscViewerAndFormat*),PetscErrorCode (*create)(PetscViewer,PetscViewerFormat,void*,PetscViewerAndFormat**),PetscErrorCode (*destroy)(PetscViewerAndFormat**))
    367: {
    368:   char           key[PETSC_MAX_PATH_LEN];

    370:   MFNInitializePackage();
    371:   SlepcMonitorMakeKey_Internal(name,vtype,format,key);
    372:   PetscFunctionListAdd(&MFNMonitorList,key,monitor);
    373:   if (create)  PetscFunctionListAdd(&MFNMonitorCreateList,key,create);
    374:   if (destroy) PetscFunctionListAdd(&MFNMonitorDestroyList,key,destroy);
    375:   return 0;
    376: }

    378: /*@
    379:    MFNReset - Resets the MFN context to the initial state (prior to setup)
    380:    and destroys any allocated Vecs and Mats.

    382:    Collective on mfn

    384:    Input Parameter:
    385: .  mfn - matrix function context obtained from MFNCreate()

    387:    Level: advanced

    389: .seealso: MFNDestroy()
    390: @*/
    391: PetscErrorCode MFNReset(MFN mfn)
    392: {
    394:   if (!mfn) return 0;
    395:   PetscTryTypeMethod(mfn,reset);
    396:   MatDestroy(&mfn->A);
    397:   BVDestroy(&mfn->V);
    398:   VecDestroyVecs(mfn->nwork,&mfn->work);
    399:   mfn->nwork = 0;
    400:   mfn->setupcalled = 0;
    401:   return 0;
    402: }

    404: /*@C
    405:    MFNDestroy - Destroys the MFN context.

    407:    Collective on mfn

    409:    Input Parameter:
    410: .  mfn - matrix function context obtained from MFNCreate()

    412:    Level: beginner

    414: .seealso: MFNCreate(), MFNSetUp(), MFNSolve()
    415: @*/
    416: PetscErrorCode MFNDestroy(MFN *mfn)
    417: {
    418:   if (!*mfn) return 0;
    420:   if (--((PetscObject)(*mfn))->refct > 0) { *mfn = NULL; return 0; }
    421:   MFNReset(*mfn);
    422:   PetscTryTypeMethod(*mfn,destroy);
    423:   FNDestroy(&(*mfn)->fn);
    424:   MatDestroy(&(*mfn)->AT);
    425:   MFNMonitorCancel(*mfn);
    426:   PetscHeaderDestroy(mfn);
    427:   return 0;
    428: }

    430: /*@
    431:    MFNSetBV - Associates a basis vectors object to the matrix function solver.

    433:    Collective on mfn

    435:    Input Parameters:
    436: +  mfn - matrix function context obtained from MFNCreate()
    437: -  bv  - the basis vectors object

    439:    Note:
    440:    Use MFNGetBV() to retrieve the basis vectors context (for example,
    441:    to free it at the end of the computations).

    443:    Level: advanced

    445: .seealso: MFNGetBV()
    446: @*/
    447: PetscErrorCode MFNSetBV(MFN mfn,BV bv)
    448: {
    452:   PetscObjectReference((PetscObject)bv);
    453:   BVDestroy(&mfn->V);
    454:   mfn->V = bv;
    455:   return 0;
    456: }

    458: /*@
    459:    MFNGetBV - Obtain the basis vectors object associated to the matrix
    460:    function solver.

    462:    Not Collective

    464:    Input Parameters:
    465: .  mfn - matrix function context obtained from MFNCreate()

    467:    Output Parameter:
    468: .  bv - basis vectors context

    470:    Level: advanced

    472: .seealso: MFNSetBV()
    473: @*/
    474: PetscErrorCode MFNGetBV(MFN mfn,BV *bv)
    475: {
    478:   if (!mfn->V) {
    479:     BVCreate(PetscObjectComm((PetscObject)mfn),&mfn->V);
    480:     PetscObjectIncrementTabLevel((PetscObject)mfn->V,(PetscObject)mfn,0);
    481:     PetscObjectSetOptions((PetscObject)mfn->V,((PetscObject)mfn)->options);
    482:   }
    483:   *bv = mfn->V;
    484:   return 0;
    485: }

    487: /*@
    488:    MFNSetFN - Specifies the function to be computed.

    490:    Collective on mfn

    492:    Input Parameters:
    493: +  mfn - matrix function context obtained from MFNCreate()
    494: -  fn  - the math function object

    496:    Note:
    497:    Use MFNGetFN() to retrieve the math function context (for example,
    498:    to free it at the end of the computations).

    500:    Level: beginner

    502: .seealso: MFNGetFN()
    503: @*/
    504: PetscErrorCode MFNSetFN(MFN mfn,FN fn)
    505: {
    509:   PetscObjectReference((PetscObject)fn);
    510:   FNDestroy(&mfn->fn);
    511:   mfn->fn = fn;
    512:   return 0;
    513: }

    515: /*@
    516:    MFNGetFN - Obtain the math function object associated to the MFN object.

    518:    Not Collective

    520:    Input Parameters:
    521: .  mfn - matrix function context obtained from MFNCreate()

    523:    Output Parameter:
    524: .  fn - math function context

    526:    Level: beginner

    528: .seealso: MFNSetFN()
    529: @*/
    530: PetscErrorCode MFNGetFN(MFN mfn,FN *fn)
    531: {
    534:   if (!mfn->fn) {
    535:     FNCreate(PetscObjectComm((PetscObject)mfn),&mfn->fn);
    536:     PetscObjectIncrementTabLevel((PetscObject)mfn->fn,(PetscObject)mfn,0);
    537:     PetscObjectSetOptions((PetscObject)mfn->fn,((PetscObject)mfn)->options);
    538:   }
    539:   *fn = mfn->fn;
    540:   return 0;
    541: }