Date: 2024-10-28T09:15:00+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 MatCreateTile.\n\n";

     13: #include <slepcsys.h>

     15: int main(int argc,char **argv)
     16: {
     17:   Mat            T,E,A;
     18:   PetscInt       i,Istart,Iend,n=10;

     20:   PetscFunctionBeginUser;
     21:   PetscCall(SlepcInitialize(&argc,&argv,NULL,help));
     22:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
     23:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"MatCreateTile test, n=%" PetscInt_FMT "\n",n));

     25:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     26:      Create T=tridiag([-1 2 -1],n,n) and E=eye(n)
     27:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

     29:   PetscCall(MatCreate(PETSC_COMM_WORLD,&T));
     30:   PetscCall(MatSetSizes(T,PETSC_DECIDE,PETSC_DECIDE,n,n));
     31:   PetscCall(MatSetFromOptions(T));

     33:   PetscCall(MatGetOwnershipRange(T,&Istart,&Iend));
     34:   for (i=Istart;i<Iend;i++) {
     35:     if (i>0) PetscCall(MatSetValue(T,i,i-1,-1.0,INSERT_VALUES));
     36:     if (i<n-1) PetscCall(MatSetValue(T,i,i+1,-1.0,INSERT_VALUES));
     37:     PetscCall(MatSetValue(T,i,i,2.0,INSERT_VALUES));
     38:   }
     39:   PetscCall(MatAssemblyBegin(T,MAT_FINAL_ASSEMBLY));
     40:   PetscCall(MatAssemblyEnd(T,MAT_FINAL_ASSEMBLY));

     42:   PetscCall(MatCreate(PETSC_COMM_WORLD,&E));
     43:   PetscCall(MatSetSizes(E,PETSC_DECIDE,PETSC_DECIDE,n,n));
     44:   PetscCall(MatSetFromOptions(E));

     46:   PetscCall(MatGetOwnershipRange(E,&Istart,&Iend));
     47:   for (i=Istart;i<Iend;i++) PetscCall(MatSetValue(E,i,i,1.0,INSERT_VALUES));
     48:   PetscCall(MatAssemblyBegin(E,MAT_FINAL_ASSEMBLY));
     49:   PetscCall(MatAssemblyEnd(E,MAT_FINAL_ASSEMBLY));

     51:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     52:      Create tiled matrix A = [ 2*T -E; 0 3*T ]
     53:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     54:   PetscCall(MatCreateTile(2.0,T,-1.0,E,0.0,E,3.0,T,&A));
     55:   PetscCall(MatView(A,NULL));

     57:   PetscCall(MatDestroy(&T));
     58:   PetscCall(MatDestroy(&E));
     59:   PetscCall(MatDestroy(&A));
     60:   PetscCall(SlepcFinalize());
     61:   return 0;
     62: }

     64: /*TEST

     66:    test:
     67:       suffix: 1
     68:       nsize: 1

     70:    test:
     71:       suffix: 2
     72:       nsize: 2

     74: TEST*/