Hi Ben, No it's not. Apples and pears are never equal, because their type is different. Just like a number and a character always differ.
R.E. Boss > -----Oorspronkelijk bericht----- > Van: Programming <programming-boun...@forums.jsoftware.com> > Namens Ben Gorte > Verzonden: zaterdag 2 maart 2019 03:47 > Aan: programm...@jsoftware.com > Onderwerp: Re: [Jprogramming] Comparing comparisons > > Hi R.E., > > Isn't that like with the apples and pears? > You can say they're not equal. > > Greetings from Sydney, > Ben. > > On Sat, Mar 2, 2019 at 4:45 AM R.E. Boss <r.e.b...@outlook.com> wrote: > > > For comparisons we have equal (=) and not equal (~:) and less than (<) > > and larger than (>). > > I ignore min (<.) and max (>.) and less or equal (<:) and larger or > > equal > > (>:) since I consider them as direct derivatives of < and >. Also > > match > > (-:) is ignored. > > > > All four (=, ~:, < and >) have dyadic rank 0, but I am more interested > > in their differences, which, to me, are rather annoying. > > We get > > =/2 4 ?.@$ 2 > > 0 0 1 1 > > for obvious reasons, and likewise with the 3 other verbs. > > > > But why is the next behavior different? > > =/;/2 4 ?.@$ 2 > > 0 > > ~:/;/2 4 ?.@$ 2 > > 1 > > </;/2 4 ?.@$ 2 > > |domain error > > | </;/2 4?.@$2 > > >/;/2 4 ?.@$ 2 > > |domain error > > | >/;/2 4?.@$2 > > > > Because we can compare the boxed items, as is shown by > > /: ;/2 4 ?.@$ 2 > > 0 1 > > > > Needless to say also the other comparisons go wrong > > <./;/2 4 ?.@$ 2 > > |domain error > > | <./;/2 4?.@$2 > > <:/;/2 4 ?.@$ 2 > > |domain error > > | <:/;/2 4?.@$2 > > > > Of course I can circumvent the errors in one way or the other, e.g. by > > using /:, but usually that costs quite some performance. > > Is there any time soon that the techniques which are used to compare > > boxed atoms, like used in /: , will be used for < and > too? > > > > > > R.E Boss > > > > ---------------------------------------------------------------------- > > For information about J forums see > http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
