Re: DiscreteUniformDistribution PDF isn't piecewise?
- To: mathgroup at smc.vnet.net
- Subject: [mg107696] Re: DiscreteUniformDistribution PDF isn't piecewise?
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Tue, 23 Feb 2010 08:03:50 -0500 (EST)
On 2/22/10 at 3:07 AM, nma at 12000.org (Nasser M. Abbasi) wrote: >"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. I believe what the original poster was doing is something like In[5]:= f = PDF[DiscreteUniformDistribution[{1, 6}]]; f[10] Out[6]= 1/6 Which is clearly the wrong result for 10. But, if f is defined as: In[7]:= Clear[f]; f = PDF[DiscreteUniformDistribution[{1, 6}], #] &; f[10] Out[9]= 0 the correct answer is obtained