On Tue, Jun 5, 2012 at 11:51 AM, Zachary Pincus zachary.pincus@yale.eduwrote:

It isn't just the array() calls which end up getting problems. For example, in 1.5.x

sage: f = 10; type(f) <type 'sage.rings.integer.Integer'> sage: numpy.arange(f) array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]) #int64

while in 1.6.x

sage: numpy.arange(f) array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], dtype=object)

We also see problems with calls like

sage: scipy.stats.uniform(0,15).ppf([0.5,0.7]) array([ 7.5, 10.5])

which work in 1.5.x, but fail with a traceback "TypeError: array cannot be safely cast to required type" in 1.6.x.

I'm getting problems like this after a 1.6 upgrade as well. Lots of object arrays being created when previously there would either be an error, or an array of floats.

Also, lots of the "TypeError: array cannot be safely cast to required type" are cropping up.

Honestly, most of these are in places where my code was lax and so I just cleaned things up to use the right dtypes etc. But still a bit unexpected in terms of having more code to fix than I was used to for 0.X numpy revisions.

There is a fine line here. We do need to make people clean up lax code in order to improve numpy, but hopefully we can keep the cleanups reasonable.

Chuck