Re: [Bug-apl] Rational Numbers

2017-07-23 Thread Juergen Sauermann 

  
  
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
0.67

  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 
  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 
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
╔╗
║0.67║
╚╝
  ⎕PS←1 22
  2÷3
╔═══╗
║2÷3║
╚═══╝
  
  (The second item in ⎕PS is a boxing
  style as in the ]BOXING command).
  
  Best Regards,
  Jürgen

Re: [Bug-apl] website problem

2017-07-23 Thread Juergen Sauermann 

  
  
Hi Dennis,
  
  not sure what you mean by "the script has stopped working. The
  link below is just
  an APL code listing.
  
  /// Jürgen
  

On 07/21/2017 11:23 AM, Dennis Yurichev
  wrote:


  Hi!

"In addition, GNU APL can be scripted. For example, this HTML page is the output of a CGI script written in APL."
( https://www.gnu.org/software/apl/ )

It seems, the script has stopped working... -> https://www.gnu.org/software/apl/APL_demo.html