Date: 2024-10-28T09:14:40+00:00

Actual source code: test1.c
slepc-3.22.1 2024-10-28
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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[] = "Test DSNHEP.\n\n";

     13: #include <slepcds.h>

     15: int main(int argc,char **argv)
     16: {
     17:   DS             ds;
     18:   SlepcSC        sc;
     19:   DSType         type;
     20:   DSStateType    state;
     21:   PetscScalar    *A,*X,*Q,*wr,*wi,d;
     22:   PetscReal      re,im,rnorm,aux;
     23:   PetscInt       i,j,n=10,ld,method;
     24:   PetscViewer    viewer;
     25:   PetscBool      verbose,extrarow;

     27:   PetscFunctionBeginUser;
     28:   PetscCall(SlepcInitialize(&argc,&argv,NULL,help));
     29:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
     30:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Solve a Dense System of type NHEP - dimension %" PetscInt_FMT ".\n",n));
     31:   PetscCall(PetscOptionsHasName(NULL,NULL,"-verbose",&verbose));
     32:   PetscCall(PetscOptionsHasName(NULL,NULL,"-extrarow",&extrarow));

     34:   /* Create DS object */
     35:   PetscCall(DSCreate(PETSC_COMM_WORLD,&ds));
     36:   PetscCall(DSSetType(ds,DSNHEP));
     37:   PetscCall(DSSetFromOptions(ds));
     38:   ld = n+2;  /* test leading dimension larger than n */
     39:   PetscCall(DSAllocate(ds,ld));
     40:   PetscCall(DSSetDimensions(ds,n,0,0));
     41:   PetscCall(DSSetExtraRow(ds,extrarow));

     43:   /* Set up viewer */
     44:   PetscCall(PetscViewerASCIIGetStdout(PETSC_COMM_WORLD,&viewer));
     45:   PetscCall(PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_INFO_DETAIL));
     46:   PetscCall(DSView(ds,viewer));
     47:   PetscCall(PetscViewerPopFormat(viewer));
     48:   if (verbose) PetscCall(PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_MATLAB));

     50:   /* Fill with Grcar matrix */
     51:   PetscCall(DSGetArray(ds,DS_MAT_A,&A));
     52:   for (i=1;i<n;i++) A[i+(i-1)*ld]=-1.0;
     53:   for (j=0;j<4;j++) {
     54:     for (i=0;i<n-j;i++) A[i+(i+j)*ld]=1.0;
     55:   }
     56:   if (extrarow) A[n+(n-1)*ld]=-1.0;
     57:   PetscCall(DSRestoreArray(ds,DS_MAT_A,&A));
     58:   PetscCall(DSSetState(ds,DS_STATE_INTERMEDIATE));
     59:   if (verbose) {
     60:     PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Initial - - - - - - - - -\n"));
     61:     PetscCall(DSView(ds,viewer));
     62:   }

     64:   /* Solve */
     65:   PetscCall(PetscMalloc2(n,&wr,n,&wi));
     66:   PetscCall(DSGetSlepcSC(ds,&sc));
     67:   sc->comparison    = SlepcCompareLargestMagnitude;
     68:   sc->comparisonctx = NULL;
     69:   sc->map           = NULL;
     70:   sc->mapobj        = NULL;
     71:   PetscCall(DSSolve(ds,wr,wi));
     72:   PetscCall(DSSort(ds,wr,wi,NULL,NULL,NULL));
     73:   if (extrarow) PetscCall(DSUpdateExtraRow(ds));

     75:   PetscCall(DSGetType(ds,&type));
     76:   PetscCall(DSGetMethod(ds,&method));
     77:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"DS of type %s, method used=%" PetscInt_FMT "\n",type,method));
     78:   PetscCall(DSGetState(ds,&state));
     79:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"State after solve: %s\n",DSStateTypes[state]));

     81:   if (verbose) {
     82:     PetscCall(PetscPrintf(PETSC_COMM_WORLD,"After solve - - - - - - - - -\n"));
     83:     PetscCall(DSView(ds,viewer));
     84:   }

     86:   /* Print eigenvalues */
     87:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Computed eigenvalues =\n"));
     88:   for (i=0;i<n;i++) {
     89: #if defined(PETSC_USE_COMPLEX)
     90:     re = PetscRealPart(wr[i]);
     91:     im = PetscImaginaryPart(wr[i]);
     92: #else
     93:     re = wr[i];
     94:     im = wi[i];
     95: #endif
     96:     if (PetscAbs(im)<1e-10) PetscCall(PetscViewerASCIIPrintf(viewer,"  %.5f\n",(double)re));
     97:     else PetscCall(PetscViewerASCIIPrintf(viewer,"  %.5f%+.5fi\n",(double)re,(double)im));
     98:   }

    100:   if (extrarow) {
    101:     /* Check that extra row is correct */
    102:     PetscCall(DSGetArray(ds,DS_MAT_A,&A));
    103:     PetscCall(DSGetArray(ds,DS_MAT_Q,&Q));
    104:     d = 0.0;
    105:     for (i=0;i<n;i++) d += A[n+i*ld]+Q[n-1+i*ld];
    106:     if (PetscAbsScalar(d)>10*PETSC_MACHINE_EPSILON) PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Warning: there is a mismatch in the extra row of %g\n",(double)PetscAbsScalar(d)));
    107:     PetscCall(DSRestoreArray(ds,DS_MAT_A,&A));
    108:     PetscCall(DSRestoreArray(ds,DS_MAT_Q,&Q));
    109:   }

    111:   /* Eigenvectors */
    112:   j = 2;
    113:   PetscCall(DSVectors(ds,DS_MAT_X,&j,&rnorm));  /* third eigenvector */
    114:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Value of rnorm for 3rd vector = %.3f\n",(double)rnorm));
    115:   PetscCall(DSVectors(ds,DS_MAT_X,NULL,NULL));  /* all eigenvectors */
    116:   j = 0;
    117:   rnorm = 0.0;
    118:   PetscCall(DSGetArray(ds,DS_MAT_X,&X));
    119:   for (i=0;i<n;i++) {
    120: #if defined(PETSC_USE_COMPLEX)
    121:     aux = PetscAbsScalar(X[i+j*ld]);
    122: #else
    123:     if (PetscAbs(wi[j])==0.0) aux = PetscAbsScalar(X[i+j*ld]);
    124:     else aux = SlepcAbsEigenvalue(X[i+j*ld],X[i+(j+1)*ld]);
    125: #endif
    126:     rnorm += aux*aux;
    127:   }
    128:   PetscCall(DSRestoreArray(ds,DS_MAT_X,&X));
    129:   rnorm = PetscSqrtReal(rnorm);
    130:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Norm of 1st vector = %.3f\n",(double)rnorm));
    131:   if (verbose) {
    132:     PetscCall(PetscPrintf(PETSC_COMM_WORLD,"After vectors - - - - - - - - -\n"));
    133:     PetscCall(DSView(ds,viewer));
    134:   }

    136:   PetscCall(PetscFree2(wr,wi));
    137:   PetscCall(DSDestroy(&ds));
    138:   PetscCall(SlepcFinalize());
    139:   return 0;
    140: }

    142: /*TEST

    144:    testset:
    145:       filter: sed -e "s/[+-]\([0-9]\.[0-9]*i\)/+-\\1/" | sed -e "s/extrarow//"
    146:       output_file: output/test1_1.out
    147:       requires: !single
    148:       test:
    149:          suffix: 1
    150:       test:
    151:          suffix: 2
    152:          args: -extrarow

    154: TEST*/