MathGroup Archive 2011

[Date Index] [Thread Index] [Author Index]

Search the Archive

Strange Probability function behavior (Bug?)

  • To: mathgroup at
  • Subject: [mg122883] Strange Probability function behavior (Bug?)
  • From: Brentt <brenttnewman at>
  • Date: Mon, 14 Nov 2011 07:07:18 -0500 (EST)
  • Delivered-to:


If I go to the Probability function  documentation, and evaluate a
probability function in the documentation notebook, the probability
function works as would be expected, for example:

In[0]:= Probability[x == 3, Distributed[x, PoissonDistribution[m]]]
> Out[0]= 1/6 E^-m m^3

So far so good.

But strangely, if I open up a new notebook and copy and paste the exact
expression from above into it, I get this

In[0]:= Probability[x == 3, Distributed[x, PoissonDistribution[m]]]
> Out[0]:= Probability[True, 3 \[Distributed] PoissonDistribution[m]]

What could possibly be happening here? Is this a bug?

  • Prev by Date: Re: large integration result for simple problem: 1/x,, also BesselJ
  • Next by Date: Re: Replace in an elegant way
  • Previous by thread: Re: Math for Trendlines
  • Next by thread: Re: Strange Probability function behavior (Bug?)