thanks :) On Wed, Dec 31, 2008 at 9:29 AM, Matthew Knepley <knepley at gmail.com> wrote:
> Yes. > > Matt > > On Wed, Dec 31, 2008 at 11:25 AM, Yujie <recrusader at gmail.com> wrote: > >> Dear Matthew: >> >> thank you very much. Regarding my problem about MatAXPY() for MPIDense, I >> have checked SEQDense has this function. To my knowledge, in each node, >> MPIDense's format is SEQDense, right? if it is, I should ba able to write a >> MPIDense-based function using SEQDense? thanks a lot. >> >> Regards, >> Yujie >> >> On Wed, Dec 31, 2008 at 8:56 AM, Matthew Knepley <knepley at gmail.com>wrote: >> >>> Yes, you can have 0 length IS arguments. >>> >>> Matt >>> >>> On Wed, Dec 31, 2008 at 10:21 AM, Yujie <recrusader at gmail.com> wrote: >>> >>>> Hi, PETSc Developers >>>> >>>> In parallel mode, I have 3 MPIDense matrices, A1, A2, A3. Now, I need to >>>> exact submatrices B1, B2, B3 in parallel mode from A1, A2, A3 respectively. >>>> I know I should use MatGetSubMatrix(). My problem is in >>>> >>>> MatGetSubMatrix(Mat mat,IS isrow,IS iscol,PetscInt csize,MatReuse cll,Mat >>>> *newmat) >>>> >>>> , the parameter "isrow" means "rows this processor should obtain". if Bi >>>> in some nodes (cpus) of the cluster (Ai have rows in them) don't have rows, >>>> is it work? >>>> >>>> After getting Bi, I will create MPIDense-based C and combine them into C >>>> like >>>> >>>> B1 >>>> C= B2 >>>> B3 >>>> MatGetRow(); >>>> MatSetValues() should work, right? >>>> >>>> Could you give me some comments about these operations? thanks a lot. >>>> Happy new year! >>>> >>>> Regards, >>>> Yujie >>>> >>> >>> >>> >>> -- >>> What most experimenters take for granted before they begin their >>> experiments is infinitely more interesting than any results to which their >>> experiments lead. >>> -- Norbert Wiener >>> >> >> > > > -- > What most experimenters take for granted before they begin their > experiments is infinitely more interesting than any results to which their > experiments lead. > -- Norbert Wiener > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20081231/f0cbac00/attachment.htm>
