[Octave-bug-tracker] [bug #38292] binopdf(0, n, 0) gives NaN instead of 1

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?38292>

                 Summary: binopdf(0,n,0) gives NaN instead of 1 
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sat Feb  9 19:31:30 2013
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Arie ten Cate
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.4
        Operating System: Microsoft Windows

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Details:

By definition, with n > 0: 
 
   binopdf(0,n,0) == 1 

This is the probability that out of n experiments, each with zero probability
of success, the are zero successes. However, Ocave gives a NaN instead of 1.

With positive but very-near-zero probability of success, Octave gives a 1. For
instance: 
 
   binopdf(0,2,1E-20) == 1 

With a finite machine precision, this is correct. 

   





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