1c4762a1bSJed Brown static char help[]="This program illustrates the use of PETSc-fftw interface for sequential 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=10,N1=10,N2=10,N3=10,N4=10,N=N0*N1*N2*N3*N4; 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 16c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 17c4762a1bSJed Brown #if defined(PETSC_USE_COMPLEX) 18c4762a1bSJed Brown SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP, "This example requires real numbers"); 19c4762a1bSJed Brown #endif 20*5f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 21*5f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 22c4762a1bSJed Brown 232c71b3e2SJacob Faibussowitsch PetscCheckFalse(size!=1,PETSC_COMM_WORLD,PETSC_ERR_SUP, "This is a uni-processor example only"); 24*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRandomCreate(PETSC_COMM_SELF, &rdm)); 25*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRandomSetFromOptions(rdm)); 26*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreate(PETSC_COMM_SELF,&input)); 27*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecSetSizes(input,N,N)); 28*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecSetFromOptions(input)); 29*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecSetRandom(input,rdm)); 30*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDuplicate(input,&output)); 31c4762a1bSJed Brown 32c4762a1bSJed Brown DIM = 5; dim[0] = N0; dim[1] = N1; dim[2] = N2; dim[3] = N3; dim[4] = N4; 33*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreateFFT(PETSC_COMM_SELF,DIM,dim,MATFFTW,&A)); 34*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreateVecs(A,&x,&y)); 35*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreateVecs(A,&z,NULL)); 36c4762a1bSJed Brown 37*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecGetSize(x,&vsize)); 38c4762a1bSJed Brown printf("The vector size of input from the main routine is %d\n",vsize); 39c4762a1bSJed Brown 40*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecGetSize(z,&vsize)); 41c4762a1bSJed Brown printf("The vector size of output from the main routine is %d\n",vsize); 42c4762a1bSJed Brown 43*5f80ce2aSJacob Faibussowitsch CHKERRQ(InputTransformFFT(A,input,x)); 44c4762a1bSJed Brown 45*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatMult(A,x,y)); 46*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatMultTranspose(A,y,z)); 47c4762a1bSJed Brown 48*5f80ce2aSJacob Faibussowitsch CHKERRQ(OutputTransformFFT(A,z,output)); 49c4762a1bSJed Brown fac = 1.0/(PetscReal)N; 50*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecScale(output,fac)); 51c4762a1bSJed Brown /* 52*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyBegin(input)); 53*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyEnd(input)); 54*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyBegin(output)); 55*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAssemblyEnd(output)); 56c4762a1bSJed Brown 57*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecView(input,PETSC_VIEWER_STDOUT_WORLD)); 58*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecView(output,PETSC_VIEWER_STDOUT_WORLD)); 59c4762a1bSJed Brown */ 60*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecAXPY(output,-1.0,input)); 61*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecNorm(output,NORM_1,&enorm)); 62c4762a1bSJed Brown /* if (enorm > 1.e-14) { */ 63*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscPrintf(PETSC_COMM_SELF," Error norm of |x - z| %e\n",enorm)); 64c4762a1bSJed Brown /* } */ 65c4762a1bSJed Brown 66*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&output)); 67*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&input)); 68*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&x)); 69*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&y)); 70*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&z)); 71*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&A)); 72*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscRandomDestroy(&rdm)); 73c4762a1bSJed Brown ierr = PetscFinalize(); 74c4762a1bSJed Brown return ierr; 75c4762a1bSJed Brown 76c4762a1bSJed Brown } 77