Re: DiscreteUniformDistribution PDF isn't piecewise?
- To: mathgroup at smc.vnet.net
- Subject: [mg107652] Re: DiscreteUniformDistribution PDF isn't piecewise?
- From: "Nasser M. Abbasi" <nma at 12000.org>
- Date: Mon, 22 Feb 2010 03:07:17 -0500 (EST)
- References: <hlqu3v$go8$1@smc.vnet.net>
"richard.wesley.todd" <richard.wesley.todd at gmail.com> wrote in message news:hlqu3v$go8$1 at smc.vnet.net... >A PDF for a discrete uniform distribution, say for a die roll... > > In[101]:= PDF[DiscreteUniformDistribution[{1, 6}]] > > Out[101]= 1/6 & > > ... gives 1/6 for all inputs, _not_ just between 1 and 6. Shouldn't > it be defined piecewise? This is from Mathematica 7.0.1.0 on > Windows. The CDF is correct. > > Not sure what you mean as you showed no example of the problem. This dist means the probability of drawing an integer between 1 and 6 by random from it is 1/6. Any random integer drawn this this pdf will have the same chance as any other. There is 1/6 chance of getting 1 or 2 or 3 or 4 or 5 or 6. That is why it is called uniform? You can't get a random number from it which is not one of those. This is how you defined it. It can only return back one of these 6 integers. Not sure how you called it, this is how I call it: In[13]:= RandomInteger[DiscreteUniformDistribution[{1,6}]] Out[13]= 4 May be there was a problem in how you called it? it will help if you show an example of the problem you had. most likely it was a programming error? fyi. I have a demo at WRI which allows one to try all the discrete distributions http://demonstrations.wolfram.com/Mathematica7sDiscreteDistributions/ --Nasser
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