Thanks. Noticed that too when I measured performance in my latest post on this subject.
R.E. Boss > -----Oorspronkelijk bericht----- > Van: [email protected] [mailto:programming- > [email protected]] Namens Sherlock, Ric > Verzonden: woensdag 17 maart 2010 22:25 > Aan: Programming forum > Onderwerp: Re: [Jprogramming] How to use dyad I. > > A minor point, but because the dyad - is rank 0, performance will be > improved by using @: rather than @ . > i.e. : > TESTS1 ,: PRICES1 {~ BUCKETS1 (#...@[ <:@:- |....@[ I. ]) TESTS1 > > Or alternatively: > TESTS1 ,: PRICES1 {~ BUCKETS1 <:@(#...@[ - |....@[ I. ]) TESTS1 > > > From: R.E. Boss > > > > If I slightly change your BUCKETS, PRICES and TESTS in > > > > BUCKETS1 =: __ , ge , {: lt > > > > PRICES1 =: __ , _ ,~ out > > > > TESTS1=: BUCKETS1 , _ > > > > and use a verb which is equivalent to Schott's Idotr and Millers F, I > > get > > > > TESTS1 ,: PRICES1 {~ BUCKETS1 (#...@[ <:@- |....@[ I. ]) TESTS1 > > __ 0 0.06 0.11 0.16 0.21 0.26 0.31 0.36 0.41 0.46 0.51 0.56 0.61 0.66 > > 0.71 > > 0.76 0.81 0.86 0.91 0.96 1.01 _ > > __ 0.1 0.18 0.26 0.32 0.38 0.44 0.5 0.54 0.58 0.62 0.66 0.7 0.74 0.78 > > 0.82 > > 0.86 0.9 0.94 0.98 1 _ _ > > > > Is this what you want? > > > > > > R.E. Boss > > > > > > > Van: Dan Bron > > > > > > When using dyad I, how does one control how to handle the various > > edge > > > conditions gracefully (specifically out-of-bounds values and > > > values exactly between intervals)? > > > > > > (1) y is greater or lesser than the head or tail of x > > > (2) y is exactly equal to a value of x, and I want to > > > decide if that means it should fall to the left > > > of the value or to the right. > > > > > > All of this with an eye to performance, of course (I don't want to do > > the > > > equality outer product x=/y to handle edge conditions, for > > > example). > > > > > > For example, how would you solve > > > http://rosettacode.org/wiki/Price_Fraction cleanly? My first quick > > hack > > > is: > > > > > > 'ge lt out'=:ALL=:|: 0 ". ];._2 noun define > > > 0.00 0.06 0.1 > > > 0.06 0.11 0.18 > > > 0.11 0.16 0.26 > > > 0.16 0.21 0.32 > > > 0.21 0.26 0.38 > > > 0.26 0.31 0.44 > > > 0.31 0.36 0.5 > > > 0.36 0.41 0.54 > > > 0.41 0.46 0.58 > > > 0.46 0.51 0.62 > > > 0.51 0.56 0.66 > > > 0.56 0.61 0.7 > > > 0.61 0.66 0.74 > > > 0.66 0.71 0.78 > > > 0.71 0.76 0.82 > > > 0.76 0.81 0.86 > > > 0.81 0.86 0.9 > > > 0.86 0.91 0.94 > > > 0.91 0.96 0.98 > > > 0.96 1.01 1 > > > ) > > > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
