hi, Ya this will give me only local entries. But what if I want the complete matrix in one array. So that I can use it with the lapack routines??
Thanks Priyank On 19-Aug-2014, at 2:09 pm, Hong <[email protected]> wrote: > Priyank: > The product C = A * B is a dense matrix in petsc mpidense format. > You should use MatDenseGetArray() > http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatDenseGetArray.html > > which gives 1D array of local entries of C. > > I notice you are using petsc-3.3. Please update to the latest version of > petsc. > > Hong > >> Hello, >> >> I have a matrix generated from matrix matrix multiplication. I want that >> matrix to convert to 1 dimensional array. my code is as below >> >> ##################################################### >> //Multiplication A * B (A is MPIAIJ & B is MPIDENSE) >> MatMatMult(A, B, MAT_INITIAL_MATRIX, PETSC_DEFAULT, &C); >> MatView(C,PETSC_VIEWER_STDOUT_WORLD); >> //Convert Matrix C to 1D vector h_C >> for(i = 0; i < m; i++) >> { >> for(j = 0; j < k; j++) >> { >> ierr = MatGetValues(C, 1, &i, 1, &j, &h_C[IDX2C(i,j,end1)]);CHKERRQ(ierr); >> } >> } >> //printArray(h_B, m, k, "h_B"); >> printArray(h_C, m, k, "A * X0"); >> ##################################################### >> when I tried the routine MatGetValues() it shows some error as below >> >> ##################################################### >> --------------------- Error Message ------------------------------------ >> [1]PETSC ERROR: No support for this operation for this object type! >> [1]PETSC ERROR: Only local values currently supported! >> [1]PETSC ERROR: >> ------------------------------------------------------------------------ >> [1]PETSC ERROR: Petsc Release Version 3.3.0, Patch 0, Tue Jun 5 14:20:42 >> CDT 2012 >> [1]PETSC ERROR: See docs/changes/index.html for recent updates. >> [1]PETSC ERROR: See docs/faq.html for hints about trouble shooting. >> [1]PETSC ERROR: See docs/index.html for manual pages. >> [1]PETSC ERROR: >> ------------------------------------------------------------------------ >> [1]PETSC ERROR: ./blockCG_1 on a arch-linu named hpcd.cs.odu.edu by ppatel >> Tue Aug 19 12:29:41 2014 >> [1]PETSC ERROR: Libraries linked from /export/software/petsc-3.3/lib >> [1]PETSC ERROR: Configure run at Wed Jun 6 16:29:21 2012 >> [1]PETSC ERROR: Configure options --prefix=/export/software/petsc-3.3 >> --download-f-blas-lapack=1 >> [1]PETSC ERROR: >> ------------------------------------------------------------------------ >> [1]PETSC ERROR: MatGetValues_MPIDense() line 180 in >> src/mat/impls/dense/mpi/mpidense.c >> [1]PETSC ERROR: MatGetValues() line 1602 in src/mat/interface/matrix.c >> [1]PETSC ERROR: main() line 343 in blockCG_1.c >> -------------------------------------------------------------------------- >> MPI_ABORT was invoked on rank 1 in communicator MPI_COMM_WORLD >> with errorcode 56. >> >> NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes. >> You may or may not see output from other processes, depending on >> exactly when Open MPI kills them. >> -------------------------------------------------------------------------- >> >> ##################################################### >> >> what is the efficient way to create a 1-D array from the PETSC matrix?
