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Groups > comp.soft-sys.math.mathematica > #16758
| From | Bill Rowe <readnews@sbcglobal.net> |
|---|---|
| Newsgroups | comp.soft-sys.math.mathematica |
| Subject | Re: Bug with ProbabilityDistribution |
| Date | 2014-04-10 07:07 +0000 |
| Message-ID | <li5fuv$3jl$1@smc.vnet.net> (permalink) |
| Organization | Time-Warner Telecom |
On 4/9/14 at 4:14 AM, cgillingham1@me.com (CHARLES GILLINGHAM) wrote:
>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?
Start with a fresh session and pay attention to the syntax
coloring. Note that x1 and x2 are undefined and your syntax does
not make these local variables. That is entering
f[x_]:=2 x
will cause x to be colored differently than your x1, x2 above.
You get undefined as a result since x1 and x2 are never defined.
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Re: Bug with ProbabilityDistribution Bill Rowe <readnews@sbcglobal.net> - 2014-04-10 07:07 +0000
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