[petsc-users] MATNEST with shell matrices

[Jed Brown]

On Thu, Feb 21, 2013 at 5:59 PM, Boyce Griffith <griffith at cims.nyu.edu>wrote:

> There is no such thing as an IS for these data structures in the current
> implementation.



But there is a local and global size. (You had to pick something to create
the Vec.) Therefore, the global space is _defined_ as the concatenation of
all those contiguous local spaces. You need not store it that way, but the
abstract space exists. If you use interfaces that ask for ISs, they will be
with respect to that abstract space.
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