Re: Strange Probability function behavior (Bug?)

• To: mathgroup at smc.vnet.net
• Subject: [mg122902] Re: Strange Probability function behavior (Bug?)
• From: Brentt <brenttnewman at gmail.com>
• Date: Tue, 15 Nov 2011 05:50:33 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <201111141207.HAA11675@smc.vnet.net>

```Oh wait, never mind, it works now that I've restarted the program. Not sure
what happened. But its fine now.

On Mon, Nov 14, 2011 at 5:43 AM, Bob Hanlon <hanlonr357 at gmail.com> wrote:

> Works here. Probability is new in version 8. Are you using version 8?
>
> \$Version
>
> "8.0 for Mac OS X x86 (64-bit) (October 5, 2011)"
>
> Probability[x == 3, Distributed[x, PoissonDistribution[m]]]
>
> ((1/6)*m^3)/E^m
>
>
> Bob Hanlon
>
>
> On Mon, Nov 14, 2011 at 7:07 AM, Brentt <brenttnewman at gmail.com> wrote:
> > Hello,
> >
> > 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?
> >
>

```

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