[petsc-users] On the usage of MatSetValuesBlocked

[Edoardo alinovi]

Hello  Matt,

I see, so from an operation point of view, I should pass a 1D array... How
should I unroll my nComp x nComp matrix? by row or by column?

e.g. say that my block is:

A=[
      1 2 3
      4 5 6
      7 8 9
     ]

than v = [1 2 3 4 5 6 7 8 9] or [1 4 7 2 5 8 3 6 9]?
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