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. remove the NOSPAM to reply