On Saturday 25 August 2007 15:48:00 Eric Firing wrote:

I've made a couple of small "emergency" edits, but a separate page would make things much more visible and less confusing.

So here it is: http://projects.scipy.org/scipy/numpy/wiki/MaskedArrayAlternative Please note the section : Optimizing maskedarray. You'll find the quick description of a test case (three implementations of divide) that emerged from on off-list discussion with Eric Firing. The problem can be formulated as "do we need to fill masked arrays before processing or not ?". Eric is in favor of the second solution (prefilling according to the domain mask), while the more it goes, the more I'm leaning towards the third one "bah, let numpy take care of that." I would be very grateful if you could post your comments/ideas/suggestions about the three implementations on that list. This is an issue I'd like to solve ASAP. Thanks a lot in advance Pierre