The only thing I'd add or maybe clarify re (B) below is that Replace also serves as "Insert (even if not already present)", so there's no need to have an 'invalid' component in order to Replace[Insert](invalids) into a field. Nevertheless, as we've both pointed out (to Neil), invalids are tricky. One of the most troubling things that has bitten us all (this is re (A) below), is if say "invalid connections" exist, but you then add or Replace ("invalid positions") into the field that aren't necessarily derived with reference to the "invalid connections". Weird things happen then. I think Nancy wrote something about this that should be findable in the list archive.
On Wednesday, Jul 2, 2003, at 14:25 America/New_York, Sharon Gibson wrote:
(A) Note: You have to be careful if you have done any other Includes on your field_______________________________
prior to the masking.
(B) I suspect that if
cull=1, you have no invalids to Replace (surprisingly, dx gives no error).
Chris Pelkie
Scientific Visualization Producer
622 Rhodes Hall, Cornell Theory Center
Ithaca, NY 14853
