I saw this but I didn't see that you are reporting a colossal slowdown
in -"_1 1 . You shouldn't change the stats code; let me fix the bug.
Henry Rich
On 9/17/2020 3:55 AM, Joseph Novakovich wrote:
Hi,
I was writing off the stats/base addon, and I noticed the
implementation for deviation from mean is slower than should be for
lists:
x =: ? 1e6 $ 0
dev =: (-"_1 _ mean) NB. current
dev0=: (- mean)`(-"_1 _ mean)@.(1<#@$) NB. proposed
10 (6!:2) 'dev x'
0.155722
10 (6!:2) 'dev0 x'
0.0015065
I sent a patch https://github.com/jsoftware/stats_base/pull/2 and Ric
Sherlock suggested I should inquire here if it's something to look at
in the language implementation instead.
Thanks,
Joseph
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