(Actually, no - it has to do with execution order and, of course, rank - parsing is the first step of execution in J, but I didn't think that one through properly.)
Thanks, -- Raul On Fri, Jan 22, 2016 at 11:03 AM, Raul Miller <[email protected]> wrote: > Order is important. > > Do you see why? > > (Hint: it has to do with implicit parenthesis provided by parsing.) > > Thanks, > > -- > Raul > > > On Fri, Jan 22, 2016 at 10:55 AM, Brian Schott <[email protected]> wrote: >> [Sorry, that was a mistake. This is a resend] >> >> #@:>@:;:'a man a plan a canal' NB. 1 >> 6 >> #@:>@;:'a man a plan a canal' NB. 2 >> 6 >> #@>@;:'a man a plan a canal' NB. 3 >> 1 3 1 4 1 5 >> #@>@:;:'a man a plan a canal' NB. 4 >> 1 3 1 4 1 5 >> #@(>@:;:)'a man a plan a canal' NB. 5 >> 6 >> #@(>@;:)'a man a plan a canal' NB. 6 >> 6 >> >> These examples are hard for me to grok. >> Comparing 1 and 2 and 4 suggests that either order is important or that # >> is effected and > is not. >> Example 6 suggests that parentheses can produce results like @: especially >> when compared with 2. >> >> My experience in the past has been especially puzzling when I try to >> combine atop with the MIDDLE TINE result of a fork as the following >> examples attempt to cover. In these example I use at and atop in the names >> to reflect the use of @ and @: ; I use app in the names to reflect the use >> of append . These examples especially the comparison between the >> application of meanatop and meanatopapp, clarify to me that atop uses the >> rank of its predecessor (% >> >> mean i. 3 4 >> 4 5 6 7 >> meanat =: +/ #@% # >> meanat i. 3 4 >> 1 1 1 1 >> meanatop =: +/ #@:% # >> meanatop i. 3 4 >> 4 >> meanatapp =: +/ #@,@% # >> meanatapp i. 3 4 >> 1 1 1 1 >> meanatopapp =: +/ #@:,@% # >> meanatopapp i. 3 4 >> 1 1 1 1 >> meanatopappparen =: +/ #@(,@%) # >> meanatopappparen i. 3 4 >> 1 1 1 1 >> meanatappparen =: +/ #@:(,@%) # >> meanatappparen i. 3 4 >> 4 >> >> >> On Fri, Jan 22, 2016 at 4:50 AM, Linda A Alvord <[email protected]> >> wrote: >> I think I finally understand the difference! >> >> A=:'a man a plan a canal' >> ;:A >> ┌─┬───┬─┬────┬─┬─────┐ >> │a│man│a│plan│a│canal│ >> └─┴───┴─┴────┴─┴─────┘ >> f=: 13 :'#>;:y' >> g=: 13 :'#@>;:y' >> h=: 13 :'#@:>;:y' >> >> >> -- >> (B=) <-----my sig >> Brian Schott >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
