Actual source code: test4.c

slepc-3.17.1 2022-04-11
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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 BV operations, changing the number of active columns.\n\n";

 13: #include <slepcbv.h>

 15: int main(int argc,char **argv)
 16: {
 17:   Vec            t,v;
 18:   Mat            Q,M;
 19:   BV             X,Y;
 20:   PetscInt       i,j,n=10,kx=6,lx=3,ky=5,ly=2;
 21:   PetscScalar    *q,*z;
 22:   PetscReal      nrm;
 23:   PetscViewer    view;
 24:   PetscBool      verbose,trans;

 26:   SlepcInitialize(&argc,&argv,(char*)0,help);
 27:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
 28:   PetscOptionsGetInt(NULL,NULL,"-kx",&kx,NULL);
 29:   PetscOptionsGetInt(NULL,NULL,"-lx",&lx,NULL);
 30:   PetscOptionsGetInt(NULL,NULL,"-ky",&ky,NULL);
 31:   PetscOptionsGetInt(NULL,NULL,"-ly",&ly,NULL);
 32:   PetscOptionsHasName(NULL,NULL,"-verbose",&verbose);
 33:   PetscPrintf(PETSC_COMM_WORLD,"First BV with %" PetscInt_FMT " active columns (%" PetscInt_FMT " leading columns) of dimension %" PetscInt_FMT ".\n",kx,lx,n);
 34:   PetscPrintf(PETSC_COMM_WORLD,"Second BV with %" PetscInt_FMT " active columns (%" PetscInt_FMT " leading columns) of dimension %" PetscInt_FMT ".\n",ky,ly,n);

 36:   /* Create template vector */
 37:   VecCreate(PETSC_COMM_WORLD,&t);
 38:   VecSetSizes(t,PETSC_DECIDE,n);
 39:   VecSetFromOptions(t);

 41:   /* Create BV object X */
 42:   BVCreate(PETSC_COMM_WORLD,&X);
 43:   PetscObjectSetName((PetscObject)X,"X");
 44:   BVSetSizesFromVec(X,t,kx+2);  /* two extra columns to test active columns */
 45:   BVSetFromOptions(X);
 46:   BVSetActiveColumns(X,lx,kx);

 48:   /* Set up viewer */
 49:   PetscViewerASCIIGetStdout(PETSC_COMM_WORLD,&view);
 50:   if (verbose) PetscViewerPushFormat(view,PETSC_VIEWER_ASCII_MATLAB);

 52:   /* Fill X entries */
 53:   for (j=0;j<kx+2;j++) {
 54:     BVGetColumn(X,j,&v);
 55:     VecSet(v,0.0);
 56:     for (i=0;i<4;i++) {
 57:       if (i+j<n) VecSetValue(v,i+j,(PetscScalar)(3*i+j-2),INSERT_VALUES);
 58:     }
 59:     VecAssemblyBegin(v);
 60:     VecAssemblyEnd(v);
 61:     BVRestoreColumn(X,j,&v);
 62:   }
 63:   if (verbose) BVView(X,view);

 65:   /* Create BV object Y */
 66:   BVCreate(PETSC_COMM_WORLD,&Y);
 67:   PetscObjectSetName((PetscObject)Y,"Y");
 68:   BVSetSizesFromVec(Y,t,ky+1);
 69:   BVSetFromOptions(Y);
 70:   BVSetActiveColumns(Y,ly,ky);

 72:   /* Fill Y entries */
 73:   for (j=0;j<ky+1;j++) {
 74:     BVGetColumn(Y,j,&v);
 75:     VecSet(v,(PetscScalar)(j+1)/4.0);
 76:     BVRestoreColumn(Y,j,&v);
 77:   }
 78:   if (verbose) BVView(Y,view);

 80:   /* Create Mat */
 81:   MatCreateSeqDense(PETSC_COMM_SELF,kx,ky,NULL,&Q);
 82:   PetscObjectSetName((PetscObject)Q,"Q");
 83:   MatDenseGetArray(Q,&q);
 84:   for (i=0;i<kx;i++)
 85:     for (j=0;j<ky;j++)
 86:       q[i+j*kx] = (i<j)? 2.0: -0.5;
 87:   MatDenseRestoreArray(Q,&q);
 88:   if (verbose) MatView(Q,NULL);

 90:   /* Test BVResize */
 91:   BVResize(X,kx+4,PETSC_TRUE);

 93:   /* Test BVMult */
 94:   BVMult(Y,2.0,0.5,X,Q);
 95:   if (verbose) {
 96:     PetscPrintf(PETSC_COMM_WORLD,"After BVMult - - - - - - - - -\n");
 97:     BVView(Y,view);
 98:   }

100:   /* Test BVMultVec */
101:   BVGetColumn(Y,0,&v);
102:   PetscMalloc1(kx-lx,&z);
103:   z[0] = 2.0;
104:   for (i=1;i<kx-lx;i++) z[i] = -0.5*z[i-1];
105:   BVMultVec(X,-1.0,1.0,v,z);
106:   PetscFree(z);
107:   BVRestoreColumn(Y,0,&v);
108:   if (verbose) {
109:     PetscPrintf(PETSC_COMM_WORLD,"After BVMultVec - - - - - - -\n");
110:     BVView(Y,view);
111:   }

113:   /* Test BVDot */
114:   MatCreateSeqDense(PETSC_COMM_SELF,ky,kx,NULL,&M);
115:   PetscObjectSetName((PetscObject)M,"M");
116:   BVDot(X,Y,M);
117:   if (verbose) {
118:     PetscPrintf(PETSC_COMM_WORLD,"After BVDot - - - - - - - - -\n");
119:     MatView(M,NULL);
120:   }

122:   /* Test BVDotVec */
123:   BVGetColumn(Y,0,&v);
124:   PetscMalloc1(kx-lx,&z);
125:   BVDotVec(X,v,z);
126:   BVRestoreColumn(Y,0,&v);
127:   if (verbose) {
128:     PetscPrintf(PETSC_COMM_WORLD,"After BVDotVec - - - - - - -\n");
129:     VecCreateSeqWithArray(PETSC_COMM_SELF,1,kx-lx,z,&v);
130:     PetscObjectSetName((PetscObject)v,"z");
131:     VecView(v,view);
132:     VecDestroy(&v);
133:   }
134:   PetscFree(z);

136:   /* Test BVMultInPlace and BVScale */
137:   PetscOptionsHasName(NULL,NULL,"-trans",&trans);
138:   if (trans) {
139:     Mat Qt;
140:     MatTranspose(Q,MAT_INITIAL_MATRIX,&Qt);
141:     BVMultInPlaceHermitianTranspose(X,Qt,lx+1,ky);
142:     MatDestroy(&Qt);
143:   } else BVMultInPlace(X,Q,lx+1,ky);
144:   BVScale(X,2.0);
145:   if (verbose) {
146:     PetscPrintf(PETSC_COMM_WORLD,"After BVMultInPlace - - - - -\n");
147:     BVView(X,view);
148:   }

150:   /* Test BVNorm */
151:   BVNormColumn(X,lx,NORM_2,&nrm);
152:   PetscPrintf(PETSC_COMM_WORLD,"2-Norm of X[%" PetscInt_FMT "] = %g\n",lx,(double)nrm);
153:   BVNorm(X,NORM_FROBENIUS,&nrm);
154:   PetscPrintf(PETSC_COMM_WORLD,"Frobenius Norm of X = %g\n",(double)nrm);

156:   BVDestroy(&X);
157:   BVDestroy(&Y);
158:   MatDestroy(&Q);
159:   MatDestroy(&M);
160:   VecDestroy(&t);
161:   SlepcFinalize();
162:   return 0;
163: }

165: /*TEST

167:    testset:
168:       output_file: output/test4_1.out
169:       args: -n 18 -kx 12 -ky 8
170:       test:
171:          suffix: 1
172:          args: -bv_type {{vecs contiguous svec mat}shared output}
173:       test:
174:          suffix: 1_vecs_vmip
175:          args: -bv_type vecs -bv_vecs_vmip 1
176:       test:
177:          suffix: 1_cuda
178:          args: -bv_type svec -vec_type cuda
179:          requires: cuda
180:       test:
181:          suffix: 2
182:          args: -bv_type {{vecs contiguous svec mat}shared output} -trans

184: TEST*/