G'day,
Still J-ing along, I believe I ran into a little performance issue. I can strip it down into: A3=:?1000000 3$100 NB. three columns of random numbers 0 .. 99 A31 =: A3,.1 NB. with an extra column of 1-s A4=:?1000000 4$100 NB. or four random columns 6!:2 'echo $~.A3' 632783 3 0.037673 6!:2 'echo $~.A31' 632783 4 24.6091 That's 600 times longer! However, 6!:2 'echo $~.A4' 995025 4 0.43277 is again much quicker. This is consistent over versions 807, 903 and 904, all with Ubuntu linux. I do need the fourth column and it has many 1-s (not all). Thanks, Ben ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
