Problem with rectangular matrices

[Jed Brown]

Matthew Knepley wrote:

> I am fine with this too, which is option 1 in my original
> mail. However, this means that when users preallocate, they must
> understand the column layout.

They are going to multiply with a vector, the layout of which must be
compatible with the column layout of the matrix.  Might be good to have
a nonsquare example in MatMPIAIJSetPreallocation or the manual.

Jed

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