On Jun 10, 2010, at 8:17 PM, Jason Grout wrote:
On 6/10/10 12:25 PM, Florent Hivert wrote:
Hi There,
I'd like to discuss a design question. Some time ago Adrien
Boussicault and
myself started to write some experimental code for copy-on-write in
Sage/Python. The idea is now more or less dropped because
performance gain was
not so good and the syntax was not very usable.
Rob and I were just talking yesterday how it's so inconvenient that
identity_matrix() now returns an immutable matrix, so constructing
something from it involves making a copy, which is not the most
obvious thing to a new person, or the most elegant thing to someone
that has been using matrices for a while now. It would be fantastic
if immutable matrices had copy-on-write semantics, not necessarily
for performance, but just for usability after some of the recent
design decisions (which I guess were made for performance reasons).
Copy on write *should* be rather easy to implement for matrices at
least.
- Robert
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