see http://www.jsoftware.com/help/release/status.htm#4.05 when [. and ]. were introduced and http://www.jsoftware.com/help/release/noncpat.htm where they were removed.
R.E. Boss > -----Oorspronkelijk bericht----- > Van: programming-boun...@jsoftware.com [mailto:programming- > boun...@jsoftware.com] Namens Bo Jacoby > Verzonden: donderdag 9 februari 2012 12:12 > Aan: Programmingforum > Onderwerp: [Jprogramming] typo in concrete math companion, ([.) > > > > http://www.jsoftware.com/books/pdf/cmc.pdf chapter 5, page 44, says > > The binomial theorem expresses a power of a sum (that is, (x+y)^t) as an > equivalent > weighted sum of products of ascending powers of x and descending powers > of y: > x=: 3 [ y=: 5 [ t=: 4 [. Ei=: i.@>: > > I didn't understand [. , nor did the interpreter. > > |spelling error > | x=: 3 [ y=: 5 [ t=: 4 [. Ei=: i.@>: > | ^ > > > I guessed that is was supposed to say > x=: 3 [ y=: 5 [ t=: 4 [ Ei=: i.@>: > but that doesn't work either: > x > 3 [ (5 [ (4 [ (i.@>:))) > y > 5 [ (4 [ (i.@>:)) > t > 4 [ (i.@>:) > Ei > i.@>: > > > - Bo > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
