Re: [Numpy-discussion] From Python to Numpy

On 30 Dec 2016, at 20:36, Alex Rogozhnikov wrote:

Hi Nicolas, that's a very nice work!

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Comments/questions/fixes/ideas are of course welcome.

Boids example brought my attention too, some comments on it: - I find using complex numbers here very natural, this should speed up things and also shorten the code (rotating without einsum, etc.) - you probably can speed up things with going to sparse arrays - and you can go to really large numbers of 'birds' if you combine it with preliminary splitting of space into squares, thus analyze only birds from close squares

Also I think worth adding some operations with HSV / HSL color spaces as those can be visualized easily e.g. on some photo.

Thanks, Alex.

Thanks. I'm not sure to know how to use complex with this example. Could you elaborate ? For the preliminary splitting, a quadtree (scipy KDTree) could also help a lot but I wanted to stick to numpy only. A simpler square splitting as you suggest could make thing faster but require some work. I'm not sure yet I see how to restrict analysis to close squares. Nicolas

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23 дек. 2016 г., в 12:14, Kiko написал(а):

2016-12-22 17:44 GMT+01:00 Nicolas P. Rougier :

Dear all,

I've just put online a (kind of) book on Numpy and more specifically about vectorization methods. It's not yet finished, has not been reviewed and it's a bit rough around the edges. But I think there are some material that can be interesting. I'm specifically happy with the boids example that show a nice combination of numpy and matplotlib strengths.

Book is online at: http://www.labri.fr/perso/nrougier/from-python-to-numpy/ Sources are available at: https://github.com/rougier/from-python-to-numpy

Comments/questions/fixes/ideas are of course welcome.

Wow!!! Beautiful.

Thanks for sharing.

Nicolas _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org https://mail.scipy.org/mailman/listinfo/numpy-discussion

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