[Numpy-discussion] problem with poisson generators

Robert Kern rkern at ucsd.edu
Thu Jul 14 00:28:06 CDT 2005


Flavio Coelho wrote:

> I  have  both numeric 23.7 and numarray 1.3.1 installed  and on neither 
> of them I could reproduce the bug when I called them directly from the 
> python interpreter. However they fail on mean 0.0 every time when called 
> within my code. So it appears to me that the Bug you mentioned is not 
> what is causing my problem. It seems to stem from interaction with the 
> way its being called, maybe some carryover from previous calls...
> this is the test I ran on the interpreter:
> [(poisson(i),i) for i in uniform(-20,20,1000) if i<=0]
> 
> I also ran:
> 
>  sum(poisson(0,100000))
> 
> they both worked flawlessly. In the first test I wanted to see if there 
> was some carry over from previous runs when called with various means 
> (which is closer to the way it is used within my code), but it returned 
> zero every time. (I don't use negative means in my code, but I wanted to 
> try it here just in case)

Are you sure that you don't have other versions of Numeric or numarray 
installed that might be getting picked up by your code?

-- 
Robert Kern
rkern at ucsd.edu

"In the fields of hell where the grass grows high
  Are the graves of dreams allowed to die."
   -- Richard Harter




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