Why so? Did I miss a non-scalar verb somewhere? Thanks, Louis
> On 9 Aug 2017, at 14:47, Raul Miller <rauldmil...@gmail.com> wrote: > > I think you have assumed that the user will use these with "0 or only > on atomic numbers? > > Thanks, > > -- > Raul > > >> On Wed, Aug 9, 2017 at 3:39 PM, Louis de Forcrand <ol...@bluewin.ch> wrote: >> A few handy tests which are good to know: >> >> N=: GI *. 1 0 e.~ * NB. naturals >> Z=: GI *. R NB. integers >> R=: = + NB. reals >> C_R=: + = - NB. pure imaginaries (C-.R) >> GI=: = <. NB. gaussian integers >> >> These were made to accept any J number. They could be optimised if one knows >> that they are working only with real numbers, for example. In that case >> >> 1 0 e.~ * >> >> could be replaced by >> >>> :&0 >> >> and the test for reals can be skipped in Z. >> >> In addition, these work with the mathematical definitions of the different >> number sets, not with J's internal storage types. >> >> Louis >> >>> On 9 Aug 2017, at 11:42, Skip Cave <s...@caveconsulting.com> wrote: >>> >>> Martin, >>> >>> The original problem I was working on was a post on Quora ( >>> https://goo.gl/NrZde2). I use these Quora math questions to help sharpen my >>> J skills. I try to see if I can "brute force" the solutions using J, while >>> most other posters try to solve these things by algebraic manipulation. My >>> answer to that question is here: (https://goo.gl/FhdJAg). There are several >>> Quora problems that I have posted J solutions for, mostly to show how >>> simple a brute force solution can be when using an array language. You can >>> find those posts by searching for my name ("Skip Cave") in Quora >>> >>> In this problem all I really needed to do was to find all the results from >>> the equation that were integers, so I used the 0=1|| scheme to find them. >>> >>> Our discussion on the J forum got me thinking about finding both the >>> fractional part and the integer part of numbers, and I thought the pair of >>> verbs (fp, ip) would be a nice addition to the Phrases doc, which is >>> defined as listing phrases "useful to beginners in learning the language, >>> and of continuing use to practical programmers." >>> >>> Also, when I obtained the fractional part, I wanted to keep the fact that >>> the fractional part came from a negative number, hence the attempt to have >>> negative fractional parts. >>> >>> Skip >>> >>> Skip Cave >>> Cave Consulting LLC >>> >>>> On Wed, Aug 9, 2017 at 9:35 AM, Martin Kreuzer <i...@airkreuzer.com> wrote: >>>> >>>> From what I've gathered so far is, that people seem to not mind that much, >>>> when extracting the fractional part from a (negative) float, they use >>>> >>>> (1&|) _8.11 >>>> 0.89 >>>> >>>> or >>>> >>>> (1&#:) _8.11 >>>> 0.89 >>>> >>>> or >>>> >>>> (**1||) _8.11 >>>> _0.11 >>>> >>>> as long as the integer and fractional part added up produce the original >>>> float value. >>>> >>>> Q: Would somebody care to give a (scaled down) real-world example so as to >>>> give me a chance to understand where this ip/fp extraction usually comes >>>> into play and what part of the data is used for decision-making..? Thanks. >>>> >>>> -M >>>> >>>> >>>> >>> ---------------------------------------------------------------------- >>> 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 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
