1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Reads in a binary file, extracts a submatrix from it, and writes to another binary file.\n\ 3c4762a1bSJed Brown Options:\n\ 4c4762a1bSJed Brown -fin <mat> : input matrix file\n\ 5c4762a1bSJed Brown -fout <mat> : output marrix file\n\ 6c4762a1bSJed Brown -start <row> : the row from where the submat should be extracted\n\ 7c4762a1bSJed Brown -m <sx> : the size of the submatrix\n"; 8c4762a1bSJed Brown 9c4762a1bSJed Brown #include <petscmat.h> 10c4762a1bSJed Brown #include <petscvec.h> 11c4762a1bSJed Brown 12c4762a1bSJed Brown int main(int argc,char **args) 13c4762a1bSJed Brown { 14c4762a1bSJed Brown char fin[PETSC_MAX_PATH_LEN],fout[PETSC_MAX_PATH_LEN] ="default.mat"; 15c4762a1bSJed Brown PetscViewer fdin,fdout; 16c4762a1bSJed Brown Vec b; 17c4762a1bSJed Brown MatType mtype = MATSEQBAIJ; 18c4762a1bSJed Brown Mat A,*B; 19c4762a1bSJed Brown PetscErrorCode ierr; 20c4762a1bSJed Brown PetscInt start=0; 21c4762a1bSJed Brown PetscInt m; 22c4762a1bSJed Brown IS isrow,iscol; 23c4762a1bSJed Brown PetscBool flg; 24c4762a1bSJed Brown 25c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 26589a23caSBarry Smith ierr = PetscOptionsGetString(NULL,NULL,"-fin",fin,sizeof(fin),&flg);CHKERRQ(ierr); 27c4762a1bSJed Brown if (!flg) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate binary file with the -fin option"); 28c4762a1bSJed Brown ierr = PetscViewerBinaryOpen(PETSC_COMM_SELF,fin,FILE_MODE_READ,&fdin);CHKERRQ(ierr); 29c4762a1bSJed Brown 30589a23caSBarry Smith ierr = PetscOptionsGetString(NULL,NULL,"-fout",fout,sizeof(fout),&flg);CHKERRQ(ierr); 31c4762a1bSJed Brown if (!flg) {ierr = PetscPrintf(PETSC_COMM_WORLD,"Writing submatrix to file : %s\n",fout);CHKERRQ(ierr);} 32c4762a1bSJed Brown ierr = PetscViewerBinaryOpen(PETSC_COMM_SELF,fout,FILE_MODE_WRITE,&fdout);CHKERRQ(ierr); 33c4762a1bSJed Brown 34c4762a1bSJed Brown ierr = MatCreate(PETSC_COMM_SELF,&A);CHKERRQ(ierr); 35c4762a1bSJed Brown ierr = MatSetType(A,mtype);CHKERRQ(ierr); 36c4762a1bSJed Brown ierr = MatLoad(A,fdin);CHKERRQ(ierr); 37c4762a1bSJed Brown ierr = PetscViewerDestroy(&fdin);CHKERRQ(ierr); 38c4762a1bSJed Brown 39c4762a1bSJed Brown ierr = MatGetSize(A,&m,&m);CHKERRQ(ierr); 40c4762a1bSJed Brown m /= 2; 41c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-start",&start,NULL);CHKERRQ(ierr); 42c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);CHKERRQ(ierr); 43c4762a1bSJed Brown 44c4762a1bSJed Brown ierr = ISCreateStride(PETSC_COMM_SELF,m,start,1,&isrow);CHKERRQ(ierr); 45c4762a1bSJed Brown ierr = ISCreateStride(PETSC_COMM_SELF,m,start,1,&iscol);CHKERRQ(ierr); 46c4762a1bSJed Brown ierr = MatCreateSubMatrices(A,1,&isrow,&iscol,MAT_INITIAL_MATRIX,&B);CHKERRQ(ierr); 47c4762a1bSJed Brown ierr = MatView(B[0],fdout);CHKERRQ(ierr); 48c4762a1bSJed Brown 49c4762a1bSJed Brown ierr = VecCreate(PETSC_COMM_SELF,&b);CHKERRQ(ierr); 50c4762a1bSJed Brown ierr = VecSetSizes(b,PETSC_DECIDE,m);CHKERRQ(ierr); 51c4762a1bSJed Brown ierr = VecSetFromOptions(b);CHKERRQ(ierr); 52c4762a1bSJed Brown ierr = MatView(B[0],fdout);CHKERRQ(ierr); 53c4762a1bSJed Brown ierr = PetscViewerDestroy(&fdout);CHKERRQ(ierr); 54c4762a1bSJed Brown 55c4762a1bSJed Brown ierr = MatDestroy(&A);CHKERRQ(ierr); 56c4762a1bSJed Brown ierr = MatDestroy(&B[0]);CHKERRQ(ierr); 57c4762a1bSJed Brown ierr = VecDestroy(&b);CHKERRQ(ierr); 58c4762a1bSJed Brown ierr = PetscFree(B);CHKERRQ(ierr); 59c4762a1bSJed Brown ierr = ISDestroy(&iscol);CHKERRQ(ierr); 60c4762a1bSJed Brown ierr = ISDestroy(&isrow);CHKERRQ(ierr); 61c4762a1bSJed Brown ierr = PetscFinalize(); 62c4762a1bSJed Brown return ierr; 63c4762a1bSJed Brown } 64c4762a1bSJed Brown 65c4762a1bSJed Brown /*TEST 66c4762a1bSJed Brown 67c4762a1bSJed Brown test: 68c4762a1bSJed Brown args: -fin ${DATAFILESPATH}/matrices/small -fout joe -start 2 -m 4 69*dfd57a17SPierre Jolivet requires: datafilespath double !complex !defined(PETSC_USE_64BIT_INDICES) 70c4762a1bSJed Brown 71c4762a1bSJed Brown TEST*/ 72c4762a1bSJed Brown 73