Date: 2024-12-02T08:57:54+00:00

Actual source code: ex48.c
slepc-3.22.2 2024-12-02
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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: static char help[] = "Solves a GSVD problem with matrices loaded from a file.\n"
     12:   "The command line options are:\n"
     13:   "  -f1 <filename>, PETSc binary file containing matrix A.\n"
     14:   "  -f2 <filename>, PETSc binary file containing matrix B (optional). Instead of"
     15:   "     a file it is possible to specify one of 'identity', 'bidiagonal' or 'tridiagonal'"
     16:   "  -p <p>, in case B is not taken from a file.\n\n";

     18: #include <slepcsvd.h>

     20: int main(int argc,char **argv)
     21: {
     22:   Mat            A,B;             /* matrices */
     23:   SVD            svd;             /* singular value problem solver context */
     24:   PetscInt       i,m,n,p,Istart,Iend,col[3];
     25:   PetscScalar    vals[3];
     26:   char           filename[PETSC_MAX_PATH_LEN];
     27:   PetscViewer    viewer;
     28:   PetscBool      flg,terse;

     30:   PetscFunctionBeginUser;
     31:   PetscCall(SlepcInitialize(&argc,&argv,NULL,help));

     33:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     34:         Load matrices that define the generalized singular value problem
     35:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

     37:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nGeneralized singular value problem stored in file.\n\n"));
     38:   PetscCall(PetscOptionsGetString(NULL,NULL,"-f1",filename,sizeof(filename),&flg));
     39:   PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER_INPUT,"Must indicate a file name for matrix A with the -f1 option");

     41: #if defined(PETSC_USE_COMPLEX)
     42:   PetscCall(PetscPrintf(PETSC_COMM_WORLD," Reading COMPLEX matrix from a binary file...\n"));
     43: #else
     44:   PetscCall(PetscPrintf(PETSC_COMM_WORLD," Reading REAL matrix from a binary file...\n"));
     45: #endif
     46:   PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer));
     47:   PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
     48:   PetscCall(MatSetFromOptions(A));
     49:   PetscCall(MatLoad(A,viewer));
     50:   PetscCall(PetscViewerDestroy(&viewer));

     52:   PetscCall(MatGetSize(A,&m,&n));

     54:   PetscCall(PetscOptionsGetString(NULL,NULL,"-f2",filename,sizeof(filename),&flg));
     55:   PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER_INPUT,"Must indicate a file name for matrix B with the -f2 option, or alternatively the strings 'identity', 'bidiagonal', or 'tridiagonal'");
     56:   PetscCall(PetscStrcmp(filename,"identity",&flg));
     57:   if (flg) {
     58:     p = n;
     59:     PetscCall(PetscOptionsGetInt(NULL,NULL,"-p",&p,&flg));
     60:     PetscCall(PetscPrintf(PETSC_COMM_WORLD," Using B=I with p=%" PetscInt_FMT "\n\n",p));
     61:     PetscCall(MatCreate(PETSC_COMM_WORLD,&B));
     62:     PetscCall(MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,p,n));
     63:     PetscCall(MatSetFromOptions(B));
     64:     PetscCall(MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY));
     65:     PetscCall(MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY));
     66:     PetscCall(MatShift(B,1.0));
     67:   } else {
     68:     PetscCall(PetscStrcmp(filename,"bidiagonal",&flg));
     69:     if (flg) {
     70:       p = n+1;
     71:       PetscCall(PetscOptionsGetInt(NULL,NULL,"-p",&p,&flg));
     72:       vals[0]=-1; vals[1]=1;
     73:       PetscCall(PetscPrintf(PETSC_COMM_WORLD," Using B=bidiag(1,-1) with p=%" PetscInt_FMT "\n\n",p));
     74:       PetscCall(MatCreate(PETSC_COMM_WORLD,&B));
     75:       PetscCall(MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,p,n));
     76:       PetscCall(MatSetFromOptions(B));
     77:       PetscCall(MatGetOwnershipRange(B,&Istart,&Iend));
     78:       for (i=Istart;i<Iend;i++) {
     79:         col[0]=i-1; col[1]=i;
     80:         if (i==0) PetscCall(MatSetValue(B,i,col[1],vals[1],INSERT_VALUES));
     81:         else if (i<n) PetscCall(MatSetValues(B,1,&i,2,col,vals,INSERT_VALUES));
     82:         else if (i==n) PetscCall(MatSetValue(B,i,col[0],vals[0],INSERT_VALUES));
     83:       }
     84:       PetscCall(MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY));
     85:       PetscCall(MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY));
     86:     } else {
     87:       PetscCall(PetscStrcmp(filename,"tridiagonal",&flg));
     88:       if (flg) {
     89:         p = n-2;
     90:         PetscCall(PetscOptionsGetInt(NULL,NULL,"-p",&p,&flg));
     91:         vals[0]=-1; vals[1]=2; vals[2]=-1;
     92:         PetscCall(PetscPrintf(PETSC_COMM_WORLD," Using B=tridiag(-1,2,-1) with p=%" PetscInt_FMT "\n\n",p));
     93:         PetscCall(MatCreate(PETSC_COMM_WORLD,&B));
     94:         PetscCall(MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,p,n));
     95:         PetscCall(MatSetFromOptions(B));
     96:         PetscCall(MatGetOwnershipRange(B,&Istart,&Iend));
     97:         for (i=Istart;i<Iend;i++) {
     98:           col[0]=i; col[1]=i+1; col[2]=i+2;
     99:           PetscCall(MatSetValues(B,1,&i,3,col,vals,INSERT_VALUES));
    100:         }
    101:         PetscCall(MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY));
    102:         PetscCall(MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY));
    103:       } else {  /* load file */
    104:         PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer));
    105:         PetscCall(MatCreate(PETSC_COMM_WORLD,&B));
    106:         PetscCall(MatSetFromOptions(B));
    107:         PetscCall(MatLoad(B,viewer));
    108:         PetscCall(PetscViewerDestroy(&viewer));
    109:       }
    110:     }
    111:   }

    113:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    114:            Create the singular value solver and set various options
    115:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

    117:   /*
    118:      Create singular value solver context
    119:   */
    120:   PetscCall(SVDCreate(PETSC_COMM_WORLD,&svd));

    122:   /*
    123:      Set operators of GSVD problem
    124:   */
    125:   PetscCall(SVDSetOperators(svd,A,B));
    126:   PetscCall(SVDSetProblemType(svd,SVD_GENERALIZED));

    128:   /*
    129:      Set solver parameters at runtime
    130:   */
    131:   PetscCall(SVDSetFromOptions(svd));

    133:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    134:                       Solve the problem and print solution
    135:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

    137:   PetscCall(SVDSolve(svd));

    139:   /* show detailed info unless -terse option is given by user */
    140:   PetscCall(PetscOptionsHasName(NULL,NULL,"-terse",&terse));
    141:   if (terse) PetscCall(SVDErrorView(svd,SVD_ERROR_NORM,NULL));
    142:   else {
    143:     PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL));
    144:     PetscCall(SVDConvergedReasonView(svd,PETSC_VIEWER_STDOUT_WORLD));
    145:     PetscCall(SVDErrorView(svd,SVD_ERROR_NORM,PETSC_VIEWER_STDOUT_WORLD));
    146:     PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD));
    147:   }
    148:   PetscCall(SVDDestroy(&svd));
    149:   PetscCall(MatDestroy(&A));
    150:   PetscCall(MatDestroy(&B));
    151:   PetscCall(SlepcFinalize());
    152:   return 0;
    153: }
    154: /*TEST

    156:    testset:
    157:       requires: double !complex !defined(PETSC_USE_64BIT_INDICES)
    158:       args: -f1 ${SLEPC_DIR}/share/slepc/datafiles/matrices/bfw62a.petsc -f2 ${SLEPC_DIR}/share/slepc/datafiles/matrices/bfw62b.petsc -svd_nsv 3 -terse
    159:       output_file: output/ex48_1.out
    160:       test:
    161:          suffix: 1
    162:          args: -svd_type trlanczos -svd_trlanczos_explicitmatrix {{0 1}} -svd_trlanczos_scale 1e5 -svd_trlanczos_ksp_rtol 1e-15
    163:       test:
    164:          suffix: 1_spqr
    165:          args: -svd_type trlanczos -svd_trlanczos_explicitmatrix -svd_trlanczos_pc_type qr -svd_trlanczos_scale 1e5 -svd_trlanczos_oneside {{0 1}}
    166:          requires: suitesparse
    167:       test:
    168:          suffix: 1_autoscale
    169:          args: -svd_type trlanczos -svd_trlanczos_gbidiag {{lower upper}} -svd_trlanczos_scale -5 -svd_trlanczos_ksp_rtol 1e-16 -svd_trlanczos_oneside {{0 1}}
    170:       test:
    171:          suffix: 1_cross
    172:          args: -svd_type cross -svd_cross_explicitmatrix
    173:       test:
    174:          suffix: 1_cyclic
    175:          args: -svd_type cyclic -svd_cyclic_explicitmatrix

    177:    testset:
    178:       requires: double complex datafilespath !defined(PETSC_USE_64BIT_INDICES)
    179:       args: -f1 ${DATAFILESPATH}/matrices/complex/qc324.petsc -f2 bidiagonal -svd_nsv 3 -terse
    180:       output_file: output/ex48_2.out
    181:       filter: sed -e "s/30749/30748/"
    182:       timeoutfactor: 2
    183:       test:
    184:          suffix: 2
    185:          args: -svd_type trlanczos -svd_trlanczos_explicitmatrix {{0 1}} -svd_trlanczos_ksp_rtol 1e-10 -svd_trlanczos_scale 100
    186:          requires: !defined(PETSCTEST_VALGRIND)
    187:       test:
    188:          suffix: 2_spqr
    189:          args: -svd_type trlanczos -svd_trlanczos_explicitmatrix -svd_trlanczos_pc_type qr -svd_trlanczos_ksp_rtol 1e-10
    190:          requires: suitesparse
    191:       test:
    192:          suffix: 2_cross
    193:          args: -svd_type cross -svd_cross_explicitmatrix
    194:       test:
    195:          suffix: 2_cyclic
    196:          args: -svd_type cyclic -svd_cyclic_explicitmatrix

    198:    test:
    199:       requires: double complex datafilespath !defined(PETSC_USE_64BIT_INDICES) !defined(PETSCTEST_VALGRIND)
    200:       args: -f1 ${DATAFILESPATH}/matrices/complex/qc324.petsc -f2 bidiagonal -p 320 -svd_nsv 3 -svd_type trlanczos -svd_trlanczos_ksp_rtol 1e-14 -svd_trlanczos_scale 100 -terse
    201:       timeoutfactor: 2
    202:       suffix: 3

    204:    testset:
    205:       requires: double !complex !defined(PETSC_USE_64BIT_INDICES)
    206:       args: -f1 ${SLEPC_DIR}/share/slepc/datafiles/matrices/rdb200.petsc -f2 identity -svd_nsv 3 -svd_ncv 24 -svd_smallest -terse
    207:       output_file: output/ex48_4.out
    208:       test:
    209:          suffix: 4
    210:          args: -svd_type trlanczos
    211:       test:
    212:          suffix: 4_spqr
    213:          args: -svd_type trlanczos -svd_trlanczos_explicitmatrix -svd_trlanczos_pc_type qr
    214:          requires: suitesparse
    215:       test:
    216:          suffix: 4_cross
    217:          args: -svd_type cross -svd_cross_explicitmatrix
    218:       test:
    219:          suffix: 4_cross_implicit
    220:          args: -svd_type cross -svd_cross_eps_type lobpcg -svd_cross_st_ksp_type cg -svd_cross_st_pc_type jacobi -svd_max_it 1000
    221:       test:
    222:          suffix: 4_cyclic
    223:          args: -svd_type cyclic -svd_cyclic_explicitmatrix
    224:       test:
    225:          suffix: 4_hpddm
    226:          nsize: 4
    227:          args: -svd_type trlanczos -svd_trlanczos_explicitmatrix -svd_trlanczos_pc_type hpddm
    228:          args: -prefix_push svd_trlanczos_pc_hpddm_ -levels_1_st_share_sub_ksp -levels_1_eps_nev 10 -levels_1_eps_threshold 0.005 -levels_1_pc_asm_type basic -define_subdomains -levels_1_pc_asm_sub_mat_type sbaij -levels_1_sub_pc_type cholesky -prefix_pop
    229:          requires: hpddm

    231: TEST*/