Perhaps use lgamma?

> lgamma(220)
[1] 964.8206

Jonathan


On Wed, Sep 29, 2010 at 3:22 PM, song song <rprojecthelp@gmail.com> wrote:

> for example, when I am calculating a posterior density, I need to calculate
> gamma(75*3+5)=gamma(220) which is out of the bound of gamma function. what
> shall I do for this condition>
>
> Thank you
>
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