1c4762a1bSJed Brown static char help[]="This program illustrates the use of PETSc-fftw interface for parallel real DFT\n"; 2c4762a1bSJed Brown #include <petscmat.h> 3c4762a1bSJed Brown #include <fftw3-mpi.h> 4ad0e0ea3SStefano Zampini int main(int argc,char **args) 5c4762a1bSJed Brown { 6c4762a1bSJed Brown PetscErrorCode ierr; 7c4762a1bSJed Brown PetscMPIInt rank,size; 8c4762a1bSJed Brown PetscInt N0=2048,N1=2048,N2=3,N3=5,N4=5,N=N0*N1; 9c4762a1bSJed Brown PetscRandom rdm; 10c4762a1bSJed Brown PetscReal enorm; 11c4762a1bSJed Brown Vec x,y,z,input,output; 12c4762a1bSJed Brown Mat A; 13c4762a1bSJed Brown PetscInt DIM, dim[5],vsize; 14c4762a1bSJed Brown PetscReal fac; 15c4762a1bSJed Brown PetscScalar one=1,two=2,three=3; 16c4762a1bSJed Brown 17c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 18c4762a1bSJed Brown #if defined(PETSC_USE_COMPLEX) 19c4762a1bSJed Brown SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP, "This example requires real numbers"); 20c4762a1bSJed Brown #endif 21*5f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 22*5f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 23c4762a1bSJed Brown 24*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRandomCreate(PETSC_COMM_WORLD, &rdm)); 25*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRandomSetFromOptions(rdm)); 26*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreate(PETSC_COMM_WORLD,&input)); 27*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecSetSizes(input,PETSC_DECIDE,N)); 28*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecSetFromOptions(input)); 29*5f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecSet(input,one)); */ 30*5f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecSetValue(input,1,two,INSERT_VALUES)); */ 31*5f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecSetValue(input,2,three,INSERT_VALUES)); */ 32*5f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecSetValue(input,3,three,INSERT_VALUES)); */ 33*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecSetRandom(input,rdm)); 34*5f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecSetRandom(input,rdm)); */ 35*5f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecSetRandom(input,rdm)); */ 36*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDuplicate(input,&output)); 37c4762a1bSJed Brown 38c4762a1bSJed Brown DIM = 2; dim[0] = N0; dim[1] = N1; dim[2] = N2; dim[3] = N3; dim[4] = N4; 39*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreateFFT(PETSC_COMM_WORLD,DIM,dim,MATFFTW,&A)); 40*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreateVecsFFTW(A,&x,&y,&z)); 41*5f80ce2aSJacob Faibussowitsch /* CHKERRQ(MatCreateVecs(A,&x,&y)); */ 42*5f80ce2aSJacob Faibussowitsch /* CHKERRQ(MatCreateVecs(A,&z,NULL)); */ 43c4762a1bSJed Brown 44*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecGetSize(x,&vsize)); 45c4762a1bSJed Brown printf("The vector size of input from the main routine is %d\n",vsize); 46c4762a1bSJed Brown 47*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecGetSize(z,&vsize)); 48c4762a1bSJed Brown printf("The vector size of output from the main routine is %d\n",vsize); 49c4762a1bSJed Brown 50*5f80ce2aSJacob Faibussowitsch CHKERRQ(InputTransformFFT(A,input,x)); 51c4762a1bSJed Brown 52*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatMult(A,x,y)); 53*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyBegin(y)); 54*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyEnd(y)); 55*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecView(y,PETSC_VIEWER_STDOUT_WORLD)); 56c4762a1bSJed Brown 57*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatMultTranspose(A,y,z)); 58c4762a1bSJed Brown 59*5f80ce2aSJacob Faibussowitsch CHKERRQ(OutputTransformFFT(A,z,output)); 60c4762a1bSJed Brown fac = 1.0/(PetscReal)N; 61*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecScale(output,fac)); 62c4762a1bSJed Brown 63*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyBegin(input)); 64*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyEnd(input)); 65*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyBegin(output)); 66*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyEnd(output)); 67c4762a1bSJed Brown 68*5f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecView(input,PETSC_VIEWER_STDOUT_WORLD)); */ 69*5f80ce2aSJacob Faibussowitsch /* CHKERRQ(VecView(output,PETSC_VIEWER_STDOUT_WORLD)); */ 70c4762a1bSJed Brown 71*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAXPY(output,-1.0,input)); 72*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecNorm(output,NORM_1,&enorm)); 73c4762a1bSJed Brown /* if (enorm > 1.e-14) { */ 74*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscPrintf(PETSC_COMM_SELF," Error norm of |x - z| %e\n",enorm)); 75c4762a1bSJed Brown /* } */ 76c4762a1bSJed Brown 77*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&output)); 78*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&input)); 79*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&x)); 80*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&y)); 81*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&z)); 82*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&A)); 83*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRandomDestroy(&rdm)); 84c4762a1bSJed Brown ierr = PetscFinalize(); 85c4762a1bSJed Brown return ierr; 86c4762a1bSJed Brown 87c4762a1bSJed Brown } 88