Date: 2015-09-03T15:05:37+00:00

Actual source code: qeplin.c
slepc-3.6.1 2015-09-03
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      1: /*

      3:    Various types of linearization for quadratic eigenvalue problem.

      5:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      6:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      7:    Copyright (c) 2002-2015, Universitat Politecnica de Valencia, Spain

      9:    This file is part of SLEPc.

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

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

     20:    You  should have received a copy of the GNU Lesser General  Public  License
     21:    along with SLEPc. If not, see <http://www.gnu.org/licenses/>.
     22:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     23: */

     25: #include <slepc/private/pepimpl.h>
     26:  #include linearp.h

     28: /*
     29:     Given the quadratic problem (l^2*M + l*C + K)*x = 0 the linearization is
     30:     A*z = l*B*z for z = [  x  ] and A,B defined as follows:
     31:                         [ l*x ]

     33:             N1:
     34:                      A = [  0   I ]     B = [ I  0 ]
     35:                          [ -K  -C ]         [ 0  M ]

     37:             N2:
     38:                      A = [ -K   0 ]     B = [ C  M ]
     39:                          [  0   I ]         [ I  0 ]

     41:             S1:
     42:                      A = [  0  -K ]     B = [-K  0 ]
     43:                          [ -K  -C ]         [ 0  M ]

     45:             S2:
     46:                      A = [ -K   0 ]     B = [ C  M ]
     47:                          [  0   M ]         [ M  0 ]

     49:             H1:
     50:                      A = [  K   0 ]     B = [ 0  K ]
     51:                          [  C   K ]         [-M  0 ]

     53:             H2:
     54:                      A = [  0  -K ]     B = [ M  C ]
     55:                          [  M   0 ]         [ 0  M ]
     56:  */

     58: /* - - - N1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

     62: PetscErrorCode MatCreateExplicit_Linear_N1A(MPI_Comm comm,PEP_LINEAR *ctx,Mat *A)
     63: {
     65:   PetscInt       M,N,m,n,i,Istart,Iend;
     66:   Mat            Id;

     69:   MatGetSize(ctx->M,&M,&N);
     70:   MatGetLocalSize(ctx->M,&m,&n);
     71:   MatCreate(PetscObjectComm((PetscObject)ctx->M),&Id);
     72:   MatSetSizes(Id,m,n,M,N);
     73:   MatSetFromOptions(Id);
     74:   MatSetUp(Id);
     75:   MatGetOwnershipRange(Id,&Istart,&Iend);
     76:   for (i=Istart;i<Iend;i++) {
     77:     MatSetValue(Id,i,i,1.0,INSERT_VALUES);
     78:   }
     79:   MatAssemblyBegin(Id,MAT_FINAL_ASSEMBLY);
     80:   MatAssemblyEnd(Id,MAT_FINAL_ASSEMBLY);
     81:   SlepcMatTile(0.0,Id,1.0,Id,-ctx->dsfactor,ctx->K,-ctx->sfactor*ctx->dsfactor,ctx->C,A);
     82:   MatDestroy(&Id);
     83:   return(0);
     84: }

     88: PetscErrorCode MatCreateExplicit_Linear_N1B(MPI_Comm comm,PEP_LINEAR *ctx,Mat *B)
     89: {
     91:   PetscInt       M,N,m,n,i,Istart,Iend;
     92:   Mat            Id;

     95:   MatGetSize(ctx->M,&M,&N);
     96:   MatGetLocalSize(ctx->M,&m,&n);
     97:   MatCreate(PetscObjectComm((PetscObject)ctx->M),&Id);
     98:   MatSetSizes(Id,m,n,M,N);
     99:   MatSetFromOptions(Id);
    100:   MatSetUp(Id);
    101:   MatGetOwnershipRange(Id,&Istart,&Iend);
    102:   for (i=Istart;i<Iend;i++) {
    103:     MatSetValue(Id,i,i,1.0,INSERT_VALUES);
    104:   }
    105:   MatAssemblyBegin(Id,MAT_FINAL_ASSEMBLY);
    106:   MatAssemblyEnd(Id,MAT_FINAL_ASSEMBLY);
    107:   SlepcMatTile(1.0,Id,0.0,Id,0.0,Id,ctx->sfactor*ctx->sfactor*ctx->dsfactor,ctx->M,B);
    108:   MatDestroy(&Id);
    109:   return(0);
    110: }

    112: /* - - - N2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

    116: PetscErrorCode MatCreateExplicit_Linear_N2A(MPI_Comm comm,PEP_LINEAR *ctx,Mat *A)
    117: {
    119:   PetscInt       M,N,m,n,i,Istart,Iend;
    120:   Mat            Id;

    123:   MatGetSize(ctx->M,&M,&N);
    124:   MatGetLocalSize(ctx->M,&m,&n);
    125:   MatCreate(PetscObjectComm((PetscObject)ctx->M),&Id);
    126:   MatSetSizes(Id,m,n,M,N);
    127:   MatSetFromOptions(Id);
    128:   MatSetUp(Id);
    129:   MatGetOwnershipRange(Id,&Istart,&Iend);
    130:   for (i=Istart;i<Iend;i++) {
    131:     MatSetValue(Id,i,i,1.0,INSERT_VALUES);
    132:   }
    133:   MatAssemblyBegin(Id,MAT_FINAL_ASSEMBLY);
    134:   MatAssemblyEnd(Id,MAT_FINAL_ASSEMBLY);
    135:   SlepcMatTile(-1.0,ctx->K,0.0,Id,0.0,Id,1.0,Id,A);
    136:   MatDestroy(&Id);
    137:   return(0);
    138: }

    142: PetscErrorCode MatCreateExplicit_Linear_N2B(MPI_Comm comm,PEP_LINEAR *ctx,Mat *B)
    143: {
    145:   PetscInt       M,N,m,n,i,Istart,Iend;
    146:   Mat            Id;

    149:   MatGetSize(ctx->M,&M,&N);
    150:   MatGetLocalSize(ctx->M,&m,&n);
    151:   MatCreate(PetscObjectComm((PetscObject)ctx->M),&Id);
    152:   MatSetSizes(Id,m,n,M,N);
    153:   MatSetFromOptions(Id);
    154:   MatSetUp(Id);
    155:   MatGetOwnershipRange(Id,&Istart,&Iend);
    156:   for (i=Istart;i<Iend;i++) {
    157:     MatSetValue(Id,i,i,1.0,INSERT_VALUES);
    158:   }
    159:   MatAssemblyBegin(Id,MAT_FINAL_ASSEMBLY);
    160:   MatAssemblyEnd(Id,MAT_FINAL_ASSEMBLY);
    161:   SlepcMatTile(ctx->sfactor,ctx->C,ctx->sfactor*ctx->sfactor,ctx->M,1.0,Id,0.0,Id,B);
    162:   MatDestroy(&Id);
    163:   return(0);
    164: }

    166: /* - - - S1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

    170: PetscErrorCode MatCreateExplicit_Linear_S1A(MPI_Comm comm,PEP_LINEAR *ctx,Mat *A)
    171: {

    175:   SlepcMatTile(0.0,ctx->K,-1.0,ctx->K,-1.0,ctx->K,-ctx->sfactor,ctx->C,A);
    176:   return(0);
    177: }

    181: PetscErrorCode MatCreateExplicit_Linear_S1B(MPI_Comm comm,PEP_LINEAR *ctx,Mat *B)
    182: {

    186:   SlepcMatTile(-1.0,ctx->K,0.0,ctx->M,0.0,ctx->M,ctx->sfactor*ctx->sfactor,ctx->M,B);
    187:   return(0);
    188: }

    190: /* - - - S2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

    194: PetscErrorCode MatCreateExplicit_Linear_S2A(MPI_Comm comm,PEP_LINEAR *ctx,Mat *A)
    195: {

    199:   SlepcMatTile(-1.0,ctx->K,0.0,ctx->M,0.0,ctx->M,ctx->sfactor*ctx->sfactor,ctx->M,A);
    200:   return(0);
    201: }

    205: PetscErrorCode MatCreateExplicit_Linear_S2B(MPI_Comm comm,PEP_LINEAR *ctx,Mat *B)
    206: {

    210:   SlepcMatTile(ctx->sfactor,ctx->C,ctx->sfactor*ctx->sfactor,ctx->M,ctx->sfactor*ctx->sfactor,ctx->M,0.0,ctx->M,B);
    211:   return(0);
    212: }

    214: /* - - - H1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

    218: PetscErrorCode MatCreateExplicit_Linear_H1A(MPI_Comm comm,PEP_LINEAR *ctx,Mat *A)
    219: {

    223:   SlepcMatTile(1.0,ctx->K,0.0,ctx->K,ctx->sfactor,ctx->C,1.0,ctx->K,A);
    224:   return(0);
    225: }

    229: PetscErrorCode MatCreateExplicit_Linear_H1B(MPI_Comm comm,PEP_LINEAR *ctx,Mat *B)
    230: {

    234:   SlepcMatTile(0.0,ctx->K,1.0,ctx->K,-ctx->sfactor*ctx->sfactor,ctx->M,0.0,ctx->K,B);
    235:   return(0);
    236: }

    238: /* - - - H2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

    242: PetscErrorCode MatCreateExplicit_Linear_H2A(MPI_Comm comm,PEP_LINEAR *ctx,Mat *A)
    243: {

    247:   SlepcMatTile(0.0,ctx->K,-1.0,ctx->K,ctx->sfactor*ctx->sfactor,ctx->M,0.0,ctx->K,A);
    248:   return(0);
    249: }

    253: PetscErrorCode MatCreateExplicit_Linear_H2B(MPI_Comm comm,PEP_LINEAR *ctx,Mat *B)
    254: {

    258:   SlepcMatTile(ctx->sfactor*ctx->sfactor,ctx->M,ctx->sfactor,ctx->C,0.0,ctx->C,ctx->sfactor*ctx->sfactor,ctx->M,B);
    259:   return(0);
    260: }