To go from indexes to mask delitems =: (] #~ [ 0:`[`]} 1 #~ #@])
1 2 delitems i. 7 2 0 1 6 7 8 9 10 11 12 13 On Tuesday, May 19, 2020, 07:56:08 a.m. EDT, HH PackRat <[email protected]> wrote: On 5/19/20, Michael Dykman <[email protected]> wrote: > In functional languages, you don't really delete so much as you make a > fresh copy absent of the undesirable elements. > Where you looking for this? > > ] a=. <"0 'abcdef' > ┌─┬─┬─┬─┬─┬─┐ > │a│b│c│d│e│f│ > └─┴─┴─┴─┴─┴─┘ > 0 0 1 1 0 1 # a > ┌─┬─┬─┐ > │c│d│f│ > └─┴─┴─┘ That kind of thing is what gave me the idea of a boolean mask of some type. However, can this be carried over, applying to rows of a table instead? I'm thinking that it probably does in some way, but I want confirmation on that. Thanks for your response! Harvey ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
