[R] Newbie

Prof Brian Ripley ripley at stats.ox.ac.uk
Thu Nov 22 15:33:42 CET 2001

```On Thu, 22 Nov 2001, Yannick Wurm wrote:

> Hi
> I started studying Bioinformatics at my engineering school (INSA de
> lyon!) in september. We started learning statistics and did two classes
> of R hands-on, but I want to learn to use R better. (As in for my every
> day calculations - I'm in front of a computer anyway so why should I
> have to take out my TI-30?) I'm having trouble finding some of the
> simpler stat functions though. (despite help.search()-ing quite a bit)
> 	How can I calculate a factorial (as in 5! = 5*4*3*2*1)?

Use gamma.  gamma(n+1) = n!

> 	How can I calculate Cnp,  the number of combinations of p elements
> out of n elements? I found binomial() but that is the binomial law and
> not simply Cnp.

?choose

> 	Does anyone have a *simple* R reference sheet for R beginners who
> only want to do simple things?

Simple is in the eye of the beholder.  These seem fairly esoteric to me.

--
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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