Chenchen,
On Thursday, May 26, 2016 at 3:37:03 PM UTC-4, Chenchen Liu wrote:
> I am modifying step-17 to do multiscale modeling. My goal is different
> from the step-17, i.e., I don't want to store the matrix in distribution.
> let's consider matrix-vector multiplication problem, [A]{u}={b}, in which
> [A] has already been obtained as a full matrix without distribution, and
> the rhs vector {b} needs to be assembled with distribution. My problem is
> how to obtain the components of the rhs vector {b}, or how to convert the
> distributed vector to a normal vector without distribution? I really need
> this even of it is not efficient.
>
> If I understand correctly, you have distributed vector but you want every
processor to own (know) the whole vector. Is that right? I think this (if
you want to use deal.II sequential vector)
https://www.dealii.org/8.4.1/doxygen/deal.II/classVector.html#aa5dbb7642901ec9bb2eeb85ff99ba89c
or this (if you want to use PETSc sequential vector)
https://www.dealii.org/8.4.1/doxygen/deal.II/classPETScWrappers_1_1Vector.html#a3b51db1336c02fd2c3ded73e05f4b7cf
should work.
Best,
Bruno
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