On Mar 15, 2011, at 6:33 PM, Jed Brown wrote: > On Wed, Mar 16, 2011 at 00:29, Barry Smith <bsmith at mcs.anl.gov> wrote: > Of course I know what A is. Because I am only doing this tracking after a > MatGetSubmatrix() has been called which provide the information about what A > is. > > Yes, that's much better and another reason for MatGetSubMatrix() to retain > ownership of the submatrices.
When you "retain ownership" you could also do things like zero the setvalues() pointer etc to prevent the user from changing it? Barry
