Groups > comp.soft-sys.math.mathematica > #16753

Bug with ProbabilityDistribution

From	CHARLES GILLINGHAM <cgillingham1@me.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Bug with ProbabilityDistribution
Date	2014-04-09 08:15 +0000
Message-ID	<li2via$pdi$1@smc.vnet.net> (permalink)
Organization	Time-Warner Telecom

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Evaluate this:

	ProbabilityDistribution[
 		Piecewise[{{0, x1 == 1 && x2 == 1}, {1/2, x1 == 1 && x2 == 0}, {0, x1 == 0 && x2 == 1}, {1/2, x1 == 0 && x2 == 0}}],
		 {x1, 0, 1, 1}, {x2, 0, 1, 1}
	 ]
	PDF[%][{1, 1}]

And you get:

	Undefined

But the probability is obviously 0

Is there something I am misunderstanding about how simple Boolean probability distributions should be set up?

Thanks.

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Bug with ProbabilityDistribution CHARLES GILLINGHAM <cgillingham1@me.com> - 2014-04-09 08:15 +0000

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