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 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
