[Octave-bug-tracker] [bug #35297] besseli returns incorrect results for negative integer orders

[Robert T. Short]

URL:
  <http://savannah.gnu.org/bugs/?35297>

                 Summary: besseli returns incorrect results for negative
integer orders
                 Project: GNU Octave
            Submitted by: rtshort
            Submitted on: Thu 12 Jan 2012 05:11:38 PM GMT
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: Robert T. Short
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.4.2
        Operating System: GNU/Linux

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Details:

In theory, besseli(n,x) = bessel(-n,x) when n is an integer.

In octave we get (for example)

octave:1> besseli(20,1),besseli(-20,1)
ans =  3.9668e-25
ans = -9.8143e+07







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