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Re: TransformedDistribution -- odd problem

• To: mathgroup at smc.vnet.net
• Subject: [mg120498] Re: TransformedDistribution -- odd problem
• From: Paul von Hippel <paulvonhippel at yahoo.com>
• Date: Tue, 26 Jul 2011 07:06:51 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <j0gh7s$bd7$1@smc.vnet.net> <201107251129.HAA25532@smc.vnet.net> <4E2EA10E.813B.006A.0@newcastle.edu.au>
• Reply-to: Paul von Hippel <paulvonhippel at yahoo.com>

That problem went away, thanks. I upgraded to 8.0.1, and I learned that Mathematica can have trouble evaluating symbols with subscripts.



________________________________
From: Barrie Stokes <Barrie.Stokes at newcastle.edu.au>
To: mathgroup at smc.vnet.net; paulvonhippel at yahoo <paulvonhippel at yahoo.com>
Sent: Monday, July 25, 2011 8:12 PM
Subject: [mg120498] Re: TransformedDistribution -- odd problem

Hi Paul

Could we see an example of "a more complicated example where Mathematica will give the mean of A and the mean of B, but when I ask for the mean of A+B Mathematica just echoes the input", please?

Barrie

>>> On 25/07/2011 at 9:29 pm, in message <201107251129.HAA25532 at smc.vnet.net>,
paulvonhippel at yahoo <paulvonhippel at yahoo.com> wrote:
> I also have a more complicated example where Mathematica will give the
> mean of A and the mean of B, but when I ask for the mean of A+B
> Mathematica just echoes the input. (Here A and B are complicated
> functions of several random variables.) This strikes me as really odd,
> since of course Mean(A+B)=Mean(A)+Mean(B).
> 
> What could be going on here? Under what circumstances does Mathematica
> echo the input when asked to provide a Mean? Is there a setting I need
> to change? I suspect this is a software issue rather than a
> mathematical issue.

• References:
  • Re: TransformedDistribution -- odd problem
    • From: paulvonhippel at yahoo <paulvonhippel@yahoo.com>