I see: (<.= >.) 1 2.5 __ 3 4.5 6
1 0 1 1 0 1 This has the same issue as (=<.) Skip Cave On Sun, Aug 2, 2020 at 7:48 AM Skip Cave <[email protected]> wrote: > 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 <[email protected]> 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 <[email protected]> >> 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
