(*./"1 a<10) # a maybe?
On Wed, Feb 19, 2014 at 5:40 PM, Joe Bogner <[email protected]> wrote: > This is an easy one, but it's escaping me after searching and trying > several things > > How can I mimic this with a 2d array? I want to only return the rows the > match a boolean expression > > Works > a=: i. 10 > (a < 5) # a > 0 1 2 3 4 > > > Does not work the way I want... > > a=:i. 5 10 > a > 0 1 2 3 4 5 6 7 8 9 > 10 11 12 13 14 15 16 17 18 19 > 20 21 22 23 24 25 26 27 28 29 > 30 31 32 33 34 35 36 37 38 39 > 40 41 42 43 44 45 46 47 48 49 > > (a < 10) > 1 1 1 1 1 1 1 1 1 1 > 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 > > (a < 10) # a > |length error > > > This kind of does it: > > (a < 10) #"1 a > 0 1 2 3 4 5 6 7 8 9 > 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
