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Re: problem with ExpectedValue[xx-x, PoissonDistribution[m],x]

• To: mathgroup at smc.vnet.net
• Subject: [mg50539] Re: [mg50126] problem with ExpectedValue[xx-x, PoissonDistribution[m],x]
• From: "Blimbaum, Jerry AA R22" <jerry.blimbaum at navy.mil>
• Date: Thu, 9 Sep 2004 05:18:51 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

I don't know the answer but one that you did not evaluate and
interestingly enough,  given the one that didn't work, worked....

ExpectedValue[x  x  - a x , PoissonDistribution[m], x]

Jerry blimbaum


-----Original Message-----
From: W Randolph Franklin [mailto:math at wrfranklinNOSPAM.org] 
To: mathgroup at smc.vnet.net
Subject: [mg50539] [mg50126] problem with ExpectedValue[xx-x,
PoissonDistribution[m],x]


(This is a repeat of my posting of Aug 5, since there were no replies,
and I am still interested in the answer.)

Why can Mathematica not evaluate 

ExpectedValue[x x  -  x, PoissonDistribution[m], x]

?

It can correctly evaluate all the following:

ExpectedValue[x x , PoissonDistribution[m], x]
ExpectedValue[x  , PoissonDistribution[m], x]
ExpectedValue[x  x  + x , PoissonDistribution[m], x] ExpectedValue[x  x
+ a x , PoissonDistribution[m], x]

Is it anticipating to think that I've found a Mathematica bug, in my
first hour of using Mathematica?  (If so, that's rather good for me and
new SW packages).

Thanks.

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