[petsc-users] Using PETSc MatIS, how to matmult a global IS matrix and a global vector ?

[Franck Houssen]

Using PETSc MatIS, how to matmult a global IS matrix and a global vector ? Example is attached : I don't get what I expect that is a vector such that proc0 = [1, 2] and proc1 = [2, 1] 

Franck 
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