Date: 2022-10-01T06:40:55+00:00

Actual source code: mfnimpl.h
slepc-3.18.0 2022-10-01
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      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: */

     11: #if !defined(SLEPCMFNIMPL_H)
     12: #define SLEPCMFNIMPL_H

     14: #include <slepcmfn.h>
     15: #include <slepc/private/slepcimpl.h>

     17: /* SUBMANSEC = MFN */

     19: SLEPC_EXTERN PetscBool MFNRegisterAllCalled;
     20: SLEPC_EXTERN PetscBool MFNMonitorRegisterAllCalled;
     21: SLEPC_EXTERN PetscErrorCode MFNRegisterAll(void);
     22: SLEPC_EXTERN PetscErrorCode MFNMonitorRegisterAll(void);
     23: SLEPC_EXTERN PetscLogEvent MFN_SetUp,MFN_Solve;

     25: typedef struct _MFNOps *MFNOps;

     27: struct _MFNOps {
     28:   PetscErrorCode (*solve)(MFN,Vec,Vec);
     29:   PetscErrorCode (*setup)(MFN);
     30:   PetscErrorCode (*setfromoptions)(MFN,PetscOptionItems*);
     31:   PetscErrorCode (*publishoptions)(MFN);
     32:   PetscErrorCode (*destroy)(MFN);
     33:   PetscErrorCode (*reset)(MFN);
     34:   PetscErrorCode (*view)(MFN,PetscViewer);
     35: };

     37: /*
     38:      Maximum number of monitors you can run with a single MFN
     39: */
     40: #define MAXMFNMONITORS 5

     42: /*
     43:    Defines the MFN data structure.
     44: */
     45: struct _p_MFN {
     46:   PETSCHEADER(struct _MFNOps);
     47:   /*------------------------- User parameters ---------------------------*/
     48:   Mat            A;                /* the problem matrix */
     49:   FN             fn;               /* which function to compute */
     50:   PetscInt       max_it;           /* maximum number of iterations */
     51:   PetscInt       ncv;              /* number of basis vectors */
     52:   PetscReal      tol;              /* tolerance */
     53:   PetscBool      errorifnotconverged;    /* error out if MFNSolve() does not converge */

     55:   /*-------------- User-provided functions and contexts -----------------*/
     56:   PetscErrorCode (*monitor[MAXMFNMONITORS])(MFN,PetscInt,PetscReal,void*);
     57:   PetscErrorCode (*monitordestroy[MAXMFNMONITORS])(void**);
     58:   void           *monitorcontext[MAXMFNMONITORS];
     59:   PetscInt       numbermonitors;

     61:   /*----------------- Child objects and working data -------------------*/
     62:   BV             V;                /* set of basis vectors */
     63:   Mat            AT;               /* the transpose of A, used in MFNSolveTranspose */
     64:   PetscInt       nwork;            /* number of work vectors */
     65:   Vec            *work;            /* work vectors */
     66:   void           *data;            /* placeholder for solver-specific stuff */

     68:   /* ----------------------- Status variables -------------------------- */
     69:   PetscInt       its;              /* number of iterations so far computed */
     70:   PetscInt       nv;               /* size of current Schur decomposition */
     71:   PetscReal      errest;           /* error estimate */
     72:   PetscReal      bnorm;            /* computed norm of right-hand side in current solve */
     73:   PetscBool      transpose_solve;  /* solve transpose system instead */
     74:   PetscInt       setupcalled;
     75:   MFNConvergedReason reason;
     76: };

     78: /*
     79:    MFN_CreateDenseMat - Creates a dense Mat of size k unless it already has that size
     80: */
     81: static inline PetscErrorCode MFN_CreateDenseMat(PetscInt k,Mat *A)
     82: {
     83:   PetscBool      create=PETSC_FALSE;
     84:   PetscInt       m,n;

     86:   if (!*A) create=PETSC_TRUE;
     87:   else {
     88:     MatGetSize(*A,&m,&n);
     89:     if (m!=k || n!=k) {
     90:       MatDestroy(A);
     91:       create=PETSC_TRUE;
     92:     }
     93:   }
     94:   if (create) MatCreateSeqDense(PETSC_COMM_SELF,k,k,NULL,A);
     95:   return 0;
     96: }

     98: /*
     99:    MFN_CreateVec - Creates a Vec of size k unless it already has that size
    100: */
    101: static inline PetscErrorCode MFN_CreateVec(PetscInt k,Vec *v)
    102: {
    103:   PetscBool      create=PETSC_FALSE;
    104:   PetscInt       n;

    106:   if (!*v) create=PETSC_TRUE;
    107:   else {
    108:     VecGetSize(*v,&n);
    109:     if (n!=k) {
    110:       VecDestroy(v);
    111:       create=PETSC_TRUE;
    112:     }
    113:   }
    114:   if (create) VecCreateSeq(PETSC_COMM_SELF,k,v);
    115:   return 0;
    116: }

    118: #endif