The reflexive case of the dyad i. (i.~y and y i. y)
on floating point arguments has been made faster
in J6.02. Likewise other verbs that depend on this
case, such as ~.y and ~:y . The following benchmarks
demonstrate the improvement.
y=: 0.07 * 1e6 [EMAIL PROTECTED] 5e5
6!:2 'Expression'
Expression J 6.02 J 6.01 Ratio
i.~ y 0.254155 0.393665 1.55
~. y 0.261515 0.400915 1.53
~: y 0.255329 0.395172 1.55
(</. [EMAIL PROTECTED]) y 0.502249 0.635284 1.26
----- Original Message -----
From: Richard Hill <[EMAIL PROTECTED]>
Date: Thursday, June 21, 2007 5:12 am
Subject: Re: [Jgeneral] Challenge to expert J'ers
> refer: J forum 07 06 20 R. Hui
> > Please re-run the benchmark on J6.01 and
> > APL+Win 6.4 on the following data:
> >
> > i=: ? 1e6 $ 5e5
> > f=: 0.07 * i
> > J6.01 APL+Win 6.4
> integer i.~ i 0.152 i{iota}i 0.511
> float i.~ f 0.985 f{iota}f 6.970
> on 1.7GHz Thinkpad 512MB
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