[Octave-bug-tracker] [bug #54220] rats() function returns wrong result

[Ales Berkopec]

URL:
  <http://savannah.gnu.org/bugs/?54220>

                 Summary: rats() function returns wrong result
                 Project: GNU Octave
            Submitted by: johntheoe
            Submitted on: Sun 01 Jul 2018 02:02:28 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: JohnTheOE
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: other
        Operating System: GNU/Linux

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Details:

I found a case of input data for which rats() function returns wrong result. 

Numbers 1620 and 12019 have no common factors (computed correctly with
factor() function, see code below), but the result of rats(1620/12019) is
439/3257. The result is not completely off. It agrees with the correct value
up to 6th decimal place.


octave:4> rats(1620/12019)
ans =  439/3257
octave:5> factor(1620)
ans =

   2   2   3   3   3   3   5

octave:6> factor(12019)
ans =

     7    17   101

octave:10> 1620/12019
ans =  0.134786587902488
octave:11> 439/3257
ans =  0.134786613447958







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