Actual source code: test1.c

slepc-3.17.0 2022-03-31
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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:   SlepcInitialize(&argc,&argv,(char*)0,help);
 21:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
 22:   PetscPrintf(PETSC_COMM_WORLD,"MatCreateTile test, n=%" PetscInt_FMT "\n",n);

 24:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 25:      Create T=tridiag([-1 2 -1],n,n) and E=eye(n)
 26:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

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

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

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

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

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

 58:   MatDestroy(&T);
 59:   MatDestroy(&E);
 60:   MatDestroy(&A);
 61:   SlepcFinalize();
 62:   return 0;
 63: }

 65: /*TEST

 67:    test:
 68:       suffix: 1
 69:       nsize: 1

 71:    test:
 72:       suffix: 2
 73:       nsize: 2

 75: TEST*/