[Numpy-discussion] need a better way to fill a grid

[John]

Thanks again everyone,

Just for completeness. First, there seems to be a problem with my
original method, but it must have to do with indexing. Apart from
being slow, it reports back maximum values a factor of two greater
than the other two methods, so something is amiss there. The other two
methods provide identical results in terms of the sums.

Original method:
~ 13.3 seconds

Pure Python per David:
~ 0.017 seconds

Numpy histogramdd per Vincent:
~ 0.007 seconds

Thanks,
john