[Yt-dev] sigma

[david collins]

I can make it an upper triangular matrix multiply.

You want a weighted sum because the numpy.array.sum function is super
optimized, over looping which is slow?

Are matrix multiplies similarly optimized?

d.

On Wed, Feb 4, 2009 at 8:35 AM, Matthew Turk <matthewturk at gmail.com> wrote:
> Guys,
>
> Dave and I talked last night about standard deviation of profiles.
> Can anybody see how to convert this one-pass algorithm:
>
> http://www.cs.berkeley.edu/~mhoemmen/cs194/Tutorials/variance.pdf
>
> into a weighted-average method?  My brain is not working today.
>
> -Matt
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