On Friday 23 July 2010 10:16:41 Ian Mallett wrote:
self.patches.sort( lambda x,y:cmp(x.residual_radiance,y.residual_radiance), reverse=True )
Using sort(key = lambda x: x.residual_radiance) should be faster.
Because I've never used arrays of Python objects (and Googling didn't turn up any examples), I'm stuck on how to sort the corresponding array in NumPy in the same way.
Of course, perhaps I'm just trying something that's absolutely impossible, or there's an obviously better way. I get the feeling that having no Python objects in the NumPy array would speed things up even more, but [...]
Exactly. Maybe you can use record arrays? (Have a look at "complex dtypes", i.e. struct-like dtypes for arrays.) Never tried sort on these, but I'd hope that's possible. HTH, Hans