I would be very interested to see the “sliding window view” function merged into np.lib.stride_tricks. I don’t think it makes sense to add a suite of dedicated functions for sliding window calculations that wrap that function. If we are going to go down the path of adding sliding window calculations into a NumPy, they should use efficient algorithms, like those found in the “bottleneck” package. Best, Stephan On Sun, Aug 25, 2019 at 3:33 PM Nicholas Georgescu <nsg27@case.edu> wrote:

Hi all,

I opened a Pull Request <https://link.getmailspring.com/link/58478F5E-3390-4C6D-8AA4-0B8724FC079A@getmailspring.com/0?redirect=https%3A%2F%2Fgithub.com%2Fnumpy%2Fnumpy%2Fpull%2F13923&recipient=bnVtcHktZGlzY3Vzc2lvbkBweXRob24ub3Jn> to include this package in numpy <https://link.getmailspring.com/link/58478F5E-3390-4C6D-8AA4-0B8724FC079A@getmailspring.com/1?redirect=https%3A%2F%2Fpypi.org%2Fproject%2Fmvgavg%2F&recipient=bnVtcHktZGlzY3Vzc2lvbkBweXRob24ub3Jn>, along with the associated sliding window function in this PR <https://link.getmailspring.com/link/58478F5E-3390-4C6D-8AA4-0B8724FC079A@getmailspring.com/2?redirect=https%3A%2F%2Fgithub.com%2Fnumpy%2Fnumpy%2Fissues%2F7753&recipient=bnVtcHktZGlzY3Vzc2lvbkBweXRob24ub3Jn> .

The function picks the fastest method to do a moving average if there is no weighting, but with weights it resorts to the second-fastest method which has an easier implementation. It also contains a binning option which cuts the number of points down by a factor of n rather than by subtracting n. The details are in the package documentation and PR.

Thanks, Nicholas [image: Sent from Mailspring] _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@python.org https://mail.python.org/mailman/listinfo/numpy-discussion

On Mon, Aug 26, 2019 at 8:38 AM Todd <toddrjen@gmail.com> wrote:

I think having some function for common cases like moving average and spectrogram would be good. Having a jumping-off point and simple reference for testing against could encourage someone to make a faster implementation down the road.

This could also be done as a docstring example in the sliding window view function. It's pretty straightforward, the moving average function in PR 13923 (fnjn_mvgavg) is ~5 lines of code. That way we don't get stuck with a function that's not as efficient as it should be, and we can point from there to `bottleneck` and/or something else that's a high-quality implementation. Cheers, Ralf

-Todd

On Mon, Aug 26, 2019 at 12:24 AM Stephan Hoyer <shoyer@gmail.com> wrote:

...

I would be very interested to see the “sliding window view” function merged into np.lib.stride_tricks.

I don’t think it makes sense to add a suite of dedicated functions for sliding window calculations that wrap that function. If we are going to go down the path of adding sliding window calculations into a NumPy, they should use efficient algorithms, like those found in the “bottleneck” package.

Best, Stephan

On Sun, Aug 25, 2019 at 3:33 PM Nicholas Georgescu <nsg27@case.edu> wrote:

...

Hi all,

I opened a Pull Request <https://link.getmailspring.com/link/58478F5E-3390-4C6D-8AA4-0B8724FC079A@getmailspring.com/0?redirect=https%3A%2F%2Fgithub.com%2Fnumpy%2Fnumpy%2Fpull%2F13923&recipient=bnVtcHktZGlzY3Vzc2lvbkBweXRob24ub3Jn> to include this package in numpy <https://link.getmailspring.com/link/58478F5E-3390-4C6D-8AA4-0B8724FC079A@getmailspring.com/1?redirect=https%3A%2F%2Fpypi.org%2Fproject%2Fmvgavg%2F&recipient=bnVtcHktZGlzY3Vzc2lvbkBweXRob24ub3Jn>, along with the associated sliding window function in this PR <https://link.getmailspring.com/link/58478F5E-3390-4C6D-8AA4-0B8724FC079A@getmailspring.com/2?redirect=https%3A%2F%2Fgithub.com%2Fnumpy%2Fnumpy%2Fissues%2F7753&recipient=bnVtcHktZGlzY3Vzc2lvbkBweXRob24ub3Jn> .

The function picks the fastest method to do a moving average if there is no weighting, but with weights it resorts to the second-fastest method which has an easier implementation. It also contains a binning option which cuts the number of points down by a factor of n rather than by subtracting n. The details are in the package documentation and PR.

Thanks, Nicholas [image: Sent from Mailspring] _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@python.org https://mail.python.org/mailman/listinfo/numpy-discussion

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

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