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 <[email protected]> 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
