1*c4762a1bSJed Brown 2*c4762a1bSJed Brown static char help[] = "Reads in a binary file, extracts a submatrix from it, and writes to another binary file.\n\ 3*c4762a1bSJed Brown Options:\n\ 4*c4762a1bSJed Brown -fin <mat> : input matrix file\n\ 5*c4762a1bSJed Brown -fout <mat> : output marrix file\n\ 6*c4762a1bSJed Brown -start <row> : the row from where the submat should be extracted\n\ 7*c4762a1bSJed Brown -m <sx> : the size of the submatrix\n"; 8*c4762a1bSJed Brown 9*c4762a1bSJed Brown #include <petscmat.h> 10*c4762a1bSJed Brown #include <petscvec.h> 11*c4762a1bSJed Brown 12*c4762a1bSJed Brown int main(int argc,char **args) 13*c4762a1bSJed Brown { 14*c4762a1bSJed Brown char fin[PETSC_MAX_PATH_LEN],fout[PETSC_MAX_PATH_LEN] ="default.mat"; 15*c4762a1bSJed Brown PetscViewer fdin,fdout; 16*c4762a1bSJed Brown Vec b; 17*c4762a1bSJed Brown MatType mtype = MATSEQBAIJ; 18*c4762a1bSJed Brown Mat A,*B; 19*c4762a1bSJed Brown PetscErrorCode ierr; 20*c4762a1bSJed Brown PetscInt start=0; 21*c4762a1bSJed Brown PetscInt m; 22*c4762a1bSJed Brown IS isrow,iscol; 23*c4762a1bSJed Brown PetscBool flg; 24*c4762a1bSJed Brown 25*c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 26*c4762a1bSJed Brown ierr = PetscOptionsGetString(NULL,NULL,"-fin",fin,PETSC_MAX_PATH_LEN,&flg);CHKERRQ(ierr); 27*c4762a1bSJed Brown if (!flg) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate binary file with the -fin option"); 28*c4762a1bSJed Brown ierr = PetscViewerBinaryOpen(PETSC_COMM_SELF,fin,FILE_MODE_READ,&fdin);CHKERRQ(ierr); 29*c4762a1bSJed Brown 30*c4762a1bSJed Brown ierr = PetscOptionsGetString(NULL,NULL,"-fout",fout,PETSC_MAX_PATH_LEN,&flg);CHKERRQ(ierr); 31*c4762a1bSJed Brown if (!flg) {ierr = PetscPrintf(PETSC_COMM_WORLD,"Writing submatrix to file : %s\n",fout);CHKERRQ(ierr);} 32*c4762a1bSJed Brown ierr = PetscViewerBinaryOpen(PETSC_COMM_SELF,fout,FILE_MODE_WRITE,&fdout);CHKERRQ(ierr); 33*c4762a1bSJed Brown 34*c4762a1bSJed Brown ierr = MatCreate(PETSC_COMM_SELF,&A);CHKERRQ(ierr); 35*c4762a1bSJed Brown ierr = MatSetType(A,mtype);CHKERRQ(ierr); 36*c4762a1bSJed Brown ierr = MatLoad(A,fdin);CHKERRQ(ierr); 37*c4762a1bSJed Brown ierr = PetscViewerDestroy(&fdin);CHKERRQ(ierr); 38*c4762a1bSJed Brown 39*c4762a1bSJed Brown ierr = MatGetSize(A,&m,&m);CHKERRQ(ierr); 40*c4762a1bSJed Brown m /= 2; 41*c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-start",&start,NULL);CHKERRQ(ierr); 42*c4762a1bSJed Brown ierr = PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);CHKERRQ(ierr); 43*c4762a1bSJed Brown 44*c4762a1bSJed Brown ierr = ISCreateStride(PETSC_COMM_SELF,m,start,1,&isrow);CHKERRQ(ierr); 45*c4762a1bSJed Brown ierr = ISCreateStride(PETSC_COMM_SELF,m,start,1,&iscol);CHKERRQ(ierr); 46*c4762a1bSJed Brown ierr = MatCreateSubMatrices(A,1,&isrow,&iscol,MAT_INITIAL_MATRIX,&B);CHKERRQ(ierr); 47*c4762a1bSJed Brown ierr = MatView(B[0],fdout);CHKERRQ(ierr); 48*c4762a1bSJed Brown 49*c4762a1bSJed Brown ierr = VecCreate(PETSC_COMM_SELF,&b);CHKERRQ(ierr); 50*c4762a1bSJed Brown ierr = VecSetSizes(b,PETSC_DECIDE,m);CHKERRQ(ierr); 51*c4762a1bSJed Brown ierr = VecSetFromOptions(b);CHKERRQ(ierr); 52*c4762a1bSJed Brown ierr = MatView(B[0],fdout);CHKERRQ(ierr); 53*c4762a1bSJed Brown ierr = PetscViewerDestroy(&fdout);CHKERRQ(ierr); 54*c4762a1bSJed Brown 55*c4762a1bSJed Brown ierr = MatDestroy(&A);CHKERRQ(ierr); 56*c4762a1bSJed Brown ierr = MatDestroy(&B[0]);CHKERRQ(ierr); 57*c4762a1bSJed Brown ierr = VecDestroy(&b);CHKERRQ(ierr); 58*c4762a1bSJed Brown ierr = PetscFree(B);CHKERRQ(ierr); 59*c4762a1bSJed Brown ierr = ISDestroy(&iscol);CHKERRQ(ierr); 60*c4762a1bSJed Brown ierr = ISDestroy(&isrow);CHKERRQ(ierr); 61*c4762a1bSJed Brown ierr = PetscFinalize(); 62*c4762a1bSJed Brown return ierr; 63*c4762a1bSJed Brown } 64*c4762a1bSJed Brown 65*c4762a1bSJed Brown /*TEST 66*c4762a1bSJed Brown 67*c4762a1bSJed Brown test: 68*c4762a1bSJed Brown args: -fin ${DATAFILESPATH}/matrices/small -fout joe -start 2 -m 4 69*c4762a1bSJed Brown requires: datafilespath double !complex !define(PETSC_USE_64BIT_INDICES) 70*c4762a1bSJed Brown 71*c4762a1bSJed Brown TEST*/ 72*c4762a1bSJed Brown 73