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Thank you!



2010/9/6 David Winsemius <dwinsemius@comcast.net>

>
> On Sep 6, 2010, at 1:13 PM, tamas barjak wrote:
>
>  Hello!
>>
>> I need some help.
>> How I know it to draw the formula of the poisson distribution?
>>
>> expr<-expression(P(xi == k) == frac(lambda^k, factorial(k))*e^-lambda)
>> --->
>> not good
>>
>
> ?plotmath
>
> (Do not see factorial as a plotmath "function"
>
> Try:
>
> expr<-expression(P(xi == k) == frac(lambda^k, k*"!")*e^-lambda)
>
>
>
>> on the screen the " k! " not the Poisson Formula, but "factorial(k)"
>>
>> Thanx!
>>
>
> -- David.
>

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