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Re: Strange Probability function behavior (Bug?)

• To: mathgroup at smc.vnet.net
• Subject: [mg122899] Re: Strange Probability function behavior (Bug?)
• From: Bob Hanlon <hanlonr357 at gmail.com>
• Date: Tue, 15 Nov 2011 05:50:01 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <201111141207.HAA11675@smc.vnet.net>

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?
>

• References:
  • Strange Probability function behavior (Bug?)
    • From: Brentt <brenttnewman@gmail.com>