fc 3!:5 Do 5!:2 5!:4 and 5!:6 have names also?
Linda -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Roger Hui Sent: Monday, January 16, 2012 12:38 AM To: Programming forum Subject: Re: [Jprogramming] i.!.1e_7~ You can use the ideas and models in http://www.jsoftware.com/jwiki/Essays/Tolerant_Comparison . Tolerant index-of is not modeled there but obtains without much difficulty: tidot=: 1 : '#@[ - +/"1@:(+./\"1)@:(m teq"0/)~' x=: 2 1 3 y=: 1+0.1*i.25 x 0.1 tidot y 1 1 3 3 3 3 3 3 0 0 0 0 0 3 3 3 3 2 2 2 2 2 2 2 3 On Sun, Jan 15, 2012 at 9:11 PM, Raul Miller <rauldmil...@gmail.com> wrote: > Let's suppose that I have some low precision floating point numbers: > > require 'dll' > PIs=: _1 fc a.{~ 219 15 73 64 220 15 73 64 218 15 73 64 > PIs > 3.14159 3.14159 3.14159 > > I would like to be able to recognize that some of these values are > close to each other > i.!.3e_7~ PIs > |domain error > > I can't use comparison tolerance on i. for this purpose, because i. > throws a domain error when I try to specify the precision I want to > use. > > I also can't use ": because I can't rely on the numbers not being "off > by one" when formatted -- but I can rely on them being close enough > that if they were slightly different they would format the same. > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
