Date: 2015-09-03T15:03:43+00:00

Actual source code: dspep.c
slepc-3.6.1 2015-09-03
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-2015, Universitat Politecnica de Valencia, Spain

      6:    This file is part of SLEPc.

      8:    SLEPc is free software: you can redistribute it and/or modify it under  the
      9:    terms of version 3 of the GNU Lesser General Public License as published by
     10:    the Free Software Foundation.

     12:    SLEPc  is  distributed in the hope that it will be useful, but WITHOUT  ANY
     13:    WARRANTY;  without even the implied warranty of MERCHANTABILITY or  FITNESS
     14:    FOR  A  PARTICULAR PURPOSE. See the GNU Lesser General Public  License  for
     15:    more details.

     17:    You  should have received a copy of the GNU Lesser General  Public  License
     18:    along with SLEPc. If not, see <http://www.gnu.org/licenses/>.
     19:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     20: */

     22: #include <slepc/private/dsimpl.h>       /*I "slepcds.h" I*/
     23: #include <slepcblaslapack.h>

     25: typedef struct {
     26:   PetscInt d;              /* polynomial degree */
     27: } DS_PEP;

     31: PetscErrorCode DSAllocate_PEP(DS ds,PetscInt ld)
     32: {
     34:   DS_PEP         *ctx = (DS_PEP*)ds->data;
     35:   PetscInt       i;

     38:   if (!ctx->d) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONGSTATE,"DSPEP requires specifying the polynomial degree via DSPEPSetDegree()");
     39:   DSAllocateMat_Private(ds,DS_MAT_X);
     40:   for (i=0;i<=ctx->d;i++) {
     41:     DSAllocateMat_Private(ds,DSMatExtra[i]);
     42:   }
     43:   PetscFree(ds->perm);
     44:   PetscMalloc1(ld*ctx->d,&ds->perm);
     45:   PetscLogObjectMemory((PetscObject)ds,ld*ctx->d*sizeof(PetscInt));
     46:   return(0);
     47: }

     51: PetscErrorCode DSView_PEP(DS ds,PetscViewer viewer)
     52: {
     53:   PetscErrorCode    ierr;
     54:   DS_PEP            *ctx = (DS_PEP*)ds->data;
     55:   PetscViewerFormat format;
     56:   PetscInt          i;

     59:   PetscViewerGetFormat(viewer,&format);
     60:   PetscViewerASCIIPrintf(viewer,"  polynomial degree: %D\n",ctx->d);
     61:   if (format == PETSC_VIEWER_ASCII_INFO || format == PETSC_VIEWER_ASCII_INFO_DETAIL) return(0);
     62:   for (i=0;i<=ctx->d;i++) {
     63:     DSViewMat(ds,viewer,DSMatExtra[i]);
     64:   }
     65:   if (ds->state>DS_STATE_INTERMEDIATE) {
     66:     ds->m = ctx->d*ds->n;  /* temporarily set number of columns */
     67:     DSViewMat(ds,viewer,DS_MAT_X);
     68:     ds->m = 0;
     69:   }
     70:   return(0);
     71: }

     75: PetscErrorCode DSVectors_PEP(DS ds,DSMatType mat,PetscInt *j,PetscReal *rnorm)
     76: {
     78:   if (rnorm) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"Not implemented yet");
     79:   switch (mat) {
     80:     case DS_MAT_X:
     81:       break;
     82:     case DS_MAT_Y:
     83:       SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"Not implemented yet");
     84:       break;
     85:     default:
     86:       SETERRQ(PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_OUTOFRANGE,"Invalid mat parameter");
     87:   }
     88:   return(0);
     89: }

     93: PetscErrorCode DSNormalize_PEP(DS ds,DSMatType mat,PetscInt col)
     94: {
     96:   switch (mat) {
     97:     case DS_MAT_X:
     98:       break;
     99:     case DS_MAT_Y:
    100:       SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"Not implemented yet");
    101:       break;
    102:     default:
    103:       SETERRQ(PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_OUTOFRANGE,"Invalid mat parameter");
    104:   }
    105:   return(0);
    106: }

    110: PetscErrorCode DSSort_PEP(DS ds,PetscScalar *wr,PetscScalar *wi,PetscScalar *rr,PetscScalar *ri,PetscInt *kout)
    111: {
    113:   DS_PEP         *ctx = (DS_PEP*)ds->data;
    114:   PetscInt       n,i,j,k,p,*perm,told,ld;
    115:   PetscScalar    *A,*X,rtmp;

    118:   if (!ds->sc) return(0);
    119:   n = ds->n*ctx->d;
    120:   A  = ds->mat[DS_MAT_A];
    121:   perm = ds->perm;
    122:   for (i=0;i<n;i++) perm[i] = i;
    123:   told = ds->t;
    124:   ds->t = n;  /* force the sorting routines to consider d*n eigenvalues */
    125:   if (rr) {
    126:     DSSortEigenvalues_Private(ds,rr,ri,perm,PETSC_FALSE);
    127:   } else {
    128:     DSSortEigenvalues_Private(ds,wr,wi,perm,PETSC_FALSE);
    129:   }
    130:   ds->t = told;  /* restore value of t */
    131:   for (i=0;i<n;i++) A[i]  = wr[perm[i]];
    132:   for (i=0;i<n;i++) wr[i] = A[i];
    133:   for (i=0;i<n;i++) A[i]  = wi[perm[i]];
    134:   for (i=0;i<n;i++) wi[i] = A[i];
    135:   /* cannot use DSPermuteColumns_Private() since matrix is not square */
    136:   ld = ds->ld;
    137:   X  = ds->mat[DS_MAT_X];
    138:   for (i=0;i<n;i++) {
    139:     p = perm[i];
    140:     if (p != i) {
    141:       j = i + 1;
    142:       while (perm[j] != i) j++;
    143:       perm[j] = p; perm[i] = i;
    144:       /* swap columns i and j */
    145:       for (k=0;k<ds->n;k++) {
    146:         rtmp = X[k+p*ld]; X[k+p*ld] = X[k+i*ld]; X[k+i*ld] = rtmp;
    147:       }
    148:     }
    149:   }
    150:   return(0);
    151: }

    155: PetscErrorCode DSSolve_PEP_QZ(DS ds,PetscScalar *wr,PetscScalar *wi)
    156: {
    157: #if defined(SLEPC_MISSING_LAPACK_GGEV)
    159:   SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"GGEV - Lapack routine is unavailable");
    160: #else
    162:   DS_PEP         *ctx = (DS_PEP*)ds->data;
    163:   PetscInt       i,j,off;
    164:   PetscScalar    *A,*B,*W,*X,*E,*work,*beta,norm;
    165:   PetscBLASInt   info,n,ldd,nd,lrwork=0,lwork,one=1;
    166: #if defined(PETSC_USE_COMPLEX)
    167:   PetscReal      *rwork;
    168: #else
    169:   PetscScalar    norm0;
    170: #endif

    173:   if (!ds->mat[DS_MAT_A]) {
    174:     DSAllocateMat_Private(ds,DS_MAT_A);
    175:   }
    176:   if (!ds->mat[DS_MAT_B]) {
    177:     DSAllocateMat_Private(ds,DS_MAT_B);
    178:   }
    179:   if (!ds->mat[DS_MAT_W]) {
    180:     DSAllocateMat_Private(ds,DS_MAT_W);
    181:   }
    182:   PetscBLASIntCast(ds->n*ctx->d,&nd);
    183:   PetscBLASIntCast(ds->n,&n);
    184:   PetscBLASIntCast(ds->ld*ctx->d,&ldd);
    185: #if defined(PETSC_USE_COMPLEX)
    186:   PetscBLASIntCast(nd+2*nd,&lwork);
    187:   PetscBLASIntCast(8*nd,&lrwork);
    188: #else
    189:   PetscBLASIntCast(nd+8*nd,&lwork);
    190: #endif
    191:   DSAllocateWork_Private(ds,lwork,lrwork,0);
    192:   beta = ds->work;
    193:   work = ds->work + nd;
    194:   lwork -= nd;
    195:   A = ds->mat[DS_MAT_A];
    196:   B = ds->mat[DS_MAT_B];
    197:   W = ds->mat[DS_MAT_W];
    198:   X = ds->mat[DS_MAT_X];
    199:   E = ds->mat[DSMatExtra[ctx->d]];

    201:   /* build matrices A and B of the linearization */
    202:   PetscMemzero(A,ldd*ldd*sizeof(PetscScalar));
    203:   for (i=0;i<nd-ds->n;i++) A[i+(i+ds->n)*ldd] = -1.0;
    204:   for (i=0;i<ctx->d;i++) {
    205:     off = i*ds->n*ldd+(ctx->d-1)*ds->n;
    206:     for (j=0;j<ds->n;j++) {
    207:       PetscMemcpy(A+off+j*ldd,ds->mat[DSMatExtra[i]]+j*ds->ld,ds->n*sizeof(PetscScalar));
    208:     }
    209:   }
    210:   PetscMemzero(B,ldd*ldd*sizeof(PetscScalar));
    211:   for (i=0;i<nd-ds->n;i++) B[i+i*ldd] = -1.0;
    212:   off = (ctx->d-1)*ds->n*(ldd+1);
    213:   for (j=0;j<ds->n;j++) {
    214:     for (i=0;i<ds->n;i++) B[off+i+j*ldd] = -E[i+j*ds->ld];
    215:   }

    217:   /* solve generalized eigenproblem */
    218: #if defined(PETSC_USE_COMPLEX)
    219:   rwork = ds->rwork;
    220:   PetscStackCallBLAS("LAPACKggev",LAPACKggev_("N","V",&nd,A,&ldd,B,&ldd,wr,beta,NULL,&ldd,W,&ldd,work,&lwork,rwork,&info));
    221:   if (info) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_LIB,"Error in Lapack ZGGEV %d",info);
    222: #else
    223:   PetscStackCallBLAS("LAPACKggev",LAPACKggev_("N","V",&nd,A,&ldd,B,&ldd,wr,wi,beta,NULL,&ldd,W,&ldd,work,&lwork,&info));
    224:   if (info) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_LIB,"Error in Lapack DGGEV %d",info);
    225: #endif

    227:   /* copy eigenvalues */
    228:   for (i=0;i<nd;i++) {
    229:     if (beta[i]==0.0) wr[i] = (PetscRealPart(wr[i])>0.0)? PETSC_MAX_REAL: PETSC_MIN_REAL;
    230:     else wr[i] /= beta[i];
    231: #if !defined(PETSC_USE_COMPLEX)
    232:     if (beta[i]==0.0) wi[i] = (wi[i]>0.0)? PETSC_MAX_REAL: PETSC_MIN_REAL;
    233:     else wi[i] /= beta[i];
    234: #else
    235:     if (wi) wi[i] = 0.0;
    236: #endif
    237:   }

    239:   /* copy and normalize eigenvectors */
    240:   for (j=0;j<nd;j++) {
    241:     PetscMemcpy(X+j*ds->ld,W+j*ldd,ds->n*sizeof(PetscScalar));
    242:   }
    243:   for (j=0;j<nd;j++) {
    244: #if !defined(PETSC_USE_COMPLEX)
    245:     if (wi[j] != 0.0) {
    246:       norm = BLASnrm2_(&n,X+j*ds->ld,&one);
    247:       norm0 = BLASnrm2_(&n,X+(j+1)*ds->ld,&one);
    248:       norm = 1.0/SlepcAbsEigenvalue(norm,norm0);
    249:       PetscStackCallBLAS("BLASscal",BLASscal_(&n,&norm,X+j*ds->ld,&one));
    250:       PetscStackCallBLAS("BLASscal",BLASscal_(&n,&norm,X+(j+1)*ds->ld,&one));
    251:       j++;
    252:     } else
    253: #endif
    254:     {
    255:       norm = 1.0/BLASnrm2_(&n,X+j*ds->ld,&one);
    256:       PetscStackCallBLAS("BLASscal",BLASscal_(&n,&norm,X+j*ds->ld,&one));
    257:     }
    258:   }
    259:   return(0);
    260: #endif
    261: }

    265: static PetscErrorCode DSPEPSetDegree_PEP(DS ds,PetscInt d)
    266: {
    267:   DS_PEP *ctx = (DS_PEP*)ds->data;

    270:   if (d<0) SETERRQ(PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_OUTOFRANGE,"The degree must be a non-negative integer");
    271:   if (d>=DS_NUM_EXTRA) SETERRQ1(PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_OUTOFRANGE,"Only implemented for polynomials of degree at most %d",DS_NUM_EXTRA-1);
    272:   ctx->d = d;
    273:   return(0);
    274: }

    278: /*@
    279:    DSPEPSetDegree - Sets the polynomial degree for a DSPEP.

    281:    Logically Collective on DS

    283:    Input Parameters:
    284: +  ds - the direct solver context
    285: -  d  - the degree

    287:    Level: intermediate

    289: .seealso: DSPEPGetDegree()
    290: @*/
    291: PetscErrorCode DSPEPSetDegree(DS ds,PetscInt d)
    292: {

    298:   PetscTryMethod(ds,"DSPEPSetDegree_C",(DS,PetscInt),(ds,d));
    299:   return(0);
    300: }

    304: static PetscErrorCode DSPEPGetDegree_PEP(DS ds,PetscInt *d)
    305: {
    306:   DS_PEP *ctx = (DS_PEP*)ds->data;

    309:   *d = ctx->d;
    310:   return(0);
    311: }

    315: /*@
    316:    DSPEPGetDegree - Returns the polynomial degree for a DSPEP.

    318:    Not collective

    320:    Input Parameter:
    321: .  ds - the direct solver context

    323:    Output Parameters:
    324: .  d - the degree

    326:    Level: intermediate

    328: .seealso: DSPEPSetDegree()
    329: @*/
    330: PetscErrorCode DSPEPGetDegree(DS ds,PetscInt *d)
    331: {

    337:   PetscTryMethod(ds,"DSPEPGetDegree_C",(DS,PetscInt*),(ds,d));
    338:   return(0);
    339: }

    343: PetscErrorCode DSDestroy_PEP(DS ds)
    344: {

    348:   PetscFree(ds->data);
    349:   PetscObjectComposeFunction((PetscObject)ds,"DSPEPSetDegree_C",NULL);
    350:   PetscObjectComposeFunction((PetscObject)ds,"DSPEPGetDegree_C",NULL);
    351:   return(0);
    352: }

    356: PETSC_EXTERN PetscErrorCode DSCreate_PEP(DS ds)
    357: {
    358:   DS_PEP         *ctx;

    362:   PetscNewLog(ds,&ctx);
    363:   ds->data = (void*)ctx;

    365:   ds->ops->allocate      = DSAllocate_PEP;
    366:   ds->ops->view          = DSView_PEP;
    367:   ds->ops->vectors       = DSVectors_PEP;
    368:   ds->ops->solve[0]      = DSSolve_PEP_QZ;
    369:   ds->ops->sort          = DSSort_PEP;
    370:   ds->ops->normalize     = DSNormalize_PEP;
    371:   ds->ops->destroy       = DSDestroy_PEP;
    372:   PetscObjectComposeFunction((PetscObject)ds,"DSPEPSetDegree_C",DSPEPSetDegree_PEP);
    373:   PetscObjectComposeFunction((PetscObject)ds,"DSPEPGetDegree_C",DSPEPGetDegree_PEP);
    374:   return(0);
    375: }