Henry said: <. = >. I'll try it out:
<. = >. 1 2.5 __ 3 4.5 6 1 0 0 0 0 0 0 1 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 Not sure what this does? Skip On Sun, Aug 2, 2020 at 7:30 AM Henry Rich <henryhr...@gmail.com> wrote: > <. = >. > > Henry Rich > > On 8/2/2020 8:24 AM, Skip Cave wrote: > > What I'm really looking for, is a verb that finds integers in a list: > > > > datatype 2.5 > > > > floating > > > > datatype 3 > > > > integer > > > > datatype __ > > > > floating > > > > > > So J considers __ as "floating" > > > > > > So I want a verb "isinteger" that marks the integers in a vector, > where __ > > is in the list, and is considered floating: > > > > isinteger 1 2.5 __ 3 4.5 6 > > 1 0 0 1 0 1 > > > > And maybe the inverse also: > > > > isfloating 1 2.5 __ 3 4.5 6 > > > > 0 1 1 0 1 0 > > > > > > My (=<,) doesn't do it: > > > > (=<.)1 2.5 __ 3 4.5 6 > > > > 1 0 1 1 0 1 > > > > > > So what would "isinteger" look like? > > > > > > Skip > > > > > > Skip Cave > > Cave Consulting LLC > > > > > > On Sun, Aug 2, 2020 at 1:44 AM Skip Cave <s...@caveconsulting.com> > wrote: > > > >> I use the (=<.) verb to find integers in a list: > >> > >> > >> * (=<.)1 2.5 2.7 3 4.5 6* > >> > >> *1 0 0 1 0 1* > >> > >> * (#~(=<.))1 2.5 2.7 3 4.5 6* > >> > >> *1 3 6* > >> > >> I ran across an interesting result when infinity is in the list: > >> > >> * (=<.)1 2.5 __ 3 4.5 6* > >> > >> *1 0 1 1 0 1* > >> > >> * (#~(=<.))1 2.5 __ 3 4.5 6* > >> > >> *1 __ 3 6* > >> > >> > >> So J is saying that the floor of infinity is infinity (and the ceiling > of > >> infinity is also infinity). Since infinity is not a number, it would > seem > >> that an error should be generated when taking the floor of infinity, or > >> perhaps NAN, or a zero? In any case, this messes up my nice > integer-finding > >> verb. Is the\re a mathematical justification for defining the floor of > >> infinity to be infinity? > >> > https://math.stackexchange.com/questions/981708/limit-of-floor-function-when-x-goes-infinity > >> > >> > >> Skip > >> > >> > >> Skip Cave > >> Cave Consulting LLC > >> > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > -- > This email has been checked for viruses by AVG. > https://www.avg.com > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
