Hi Jürgen, Thanks go to you for the prompt response. I do really appreciate it.
Regards, Ala'a On Sat, Aug 12, 2017 at 12:26 AM, Juergen Sauermann <juergen.sauerm...@t-online.de> wrote: > Hi Ala'a, > > thanks, fixed in SVN 993. > > /// Jürgen > > > On 08/11/2017 03:22 PM, Ala'a Mohammad wrote: > > Hi Jürgen, > > I was playing with experimental support for rational numbers and found > that result was converted to float while using dyadic maximum, > minimum, even though I did not use the monadic + > > (1÷3) ⌈ (3÷4) > 0.75 > > (1÷3) ⌊ (3÷4) > 0.3333333333 > > Is this the intended display? > > Also by accident, I was playing with the support and the strange > display of the following occurred > > ÷¯1÷3 > 3÷18446744073709551615 > > Entering the above result gives another number > > 3÷18446744073709551615 > 1.626303259E¯19 > > The positive case works better (even though I had expected one digit > display only '3'), but somehow the neg mess-up the display > > ÷1÷3 > 3÷1 > > Regards, > > Ala'a > > On Sun, Jul 23, 2017 at 5:28 PM, Juergen Sauermann > <juergen.sauerm...@t-online.de> wrote: > > Hi Elias, > > the format bug is fixed in SVN 983. > > Rational numbers are exact, they are stored as a 64 bit numerator and a 64 > bit denominator. > You can convert a rational to a float with monadic +: > > ⎕PS←1 0 ⍝ display quotients > 2÷3 > 2÷3 > +2÷3 > 0.6666666667 > > Normally monadic + is not needed because conversion to double happens > automatically where needed. > > /// Jürgen > > > On 07/21/2017 06:19 AM, Elias Mårtenson wrote: > > There is an error in the rational code: > > In Archive.cc, line 218, the snprintf format is wrong. %lld is used, while > the types of the arguments are actually "long". Thus, "%lld÷%lld" should be > "%ld÷%ld" instead. > > On 21 July 2017 at 12:06, Elias Mårtenson <loke...@gmail.com> wrote: > > I haven't looked at this yet, but is this purely a display feature, or is > it a full implementation of rational numbers? > > In other words, is the result of 1÷3 exact? And if so, how do I convert a > rational number into a floating-point number? > > Regards, > Elias > > On 21 July 2017 at 00:05, Juergen Sauermann > <juergen.sauerm...@t-online.de> wrote: > > Hi, > > coming back to a proposal from Elias, I have added (experimental) support > for rational numbers in GNU APL. SVN 982. > > It has to be enabled explicitly: > > ./configure RATIONAL_NUMBERS_WANTED=yes > > In APL you can display rational numbers by setting ⎕PS[1]: > > ⎕PS←0 22 > 2÷3 > ╔════════════╗ > ║0.6666666667║ > ╚════════════╝ > ⎕PS←1 22 > 2÷3 > ╔═══╗ > ║2÷3║ > ╚═══╝ > > (The second item in ⎕PS is a boxing style as in the ]BOXING command). > > Best Regards, > Jürgen > > >
