[petsc-users] MatMatMult

[Emmanuel Ayala]

Thanks for the answer.

Emmanuel:
> You can create a dense C with the required parallel layout without
> calling MatAssemblyBegin() and MatAssemblyEnd().
> Did you get error without calling these routines?
>

Yes, the output is (after create the C dense matrix and do not assembly it,
run1 - see attached file -):

[0]PETSC ERROR: --------------------- Error Message
--------------------------------------------------------------
[0]PETSC ERROR: Object is in wrong state
[0]PETSC ERROR: Not for unassembled matrix
[0]PETSC ERROR: See https://www.mcs.anl.gov/petsc/documentation/faq.html
for trouble shooting.
[0]PETSC ERROR: Petsc Release Version 3.12.4, Feb, 04, 2020
[0]PETSC ERROR: ./comp on a arch-linux-c-opt-O2 named ayala by ayala Thu
Feb 27 16:47:15 2020
[0]PETSC ERROR: Configure options --with-debugging=0 COPTFLAGS="-O2
-march=native -mtune=native" CXXOPTFLAGS="-O2 -march=native -mtune=native"
FOPTFLAGS="-O2 -march=native -mtune=native" --download-mpich=1
--download-fblaslapack=1 --with-cxx-dialect=C++11
[0]PETSC ERROR: #1 MatNorm() line 5123 in
/home/ayala/Documents/PETSc/petsc-3.12.4/src/mat/interface/matrix.c

We only updated the help manu, not internal implementation. In the next
> release, we'll introduce new set of API to consolidate the API of
> mat-mat-operations.
> Hong
>

I attach my test file, or maybe I'm doing something wrong. I tested this
file on my laptop ubuntu 18

Kind regards.
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