[AstroPy] numerical problems in sum

[Gabriele Brambilla]

Hi,
I'm calculating the energy spectrum of photons emitted by of a lot of
accelerated particles.
After I have calculated the amount of energy for a single particle in a
particular energy interval I sum them all together in this way:

MYMAP[i, j, k] = MYMAP[i, j, k] + www

where the 3d matrix is a np.array.

I have strong reasons to think that in this operation happens some
numerical error...Have you suggestions to discover where it is?

My results differs a bit from the one obtained by another guy.

thanks

Gabriele
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