[Octave-bug-tracker] [bug #36328] Poissrnd bug for lambda =0 (again)

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?36328>

                 Summary: Poissrnd bug for lambda =0 (again)
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sat 28 Apr 2012 02:00:27 PM UTC
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.1
        Operating System: GNU/Linux

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Details:

Hi 

poissrnd(0, 1,1)
returns a NaN.

Poissonrnd should return a zero instead.
(Mathematically there is nothing wrong with a poisson process
with rate 0, the outcome is simply always zero)

The fix is simple.
In poissrnd.m replace twice
if (lambda > 0...
with
if (lambda >= 0...


Note this is a regression from  bug  address@hidden reported ages ago.






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