[R] Calculate an equation

[P.Branco]

Dear all,

I was wondering if you could help me with the following.

I want to do calculate this equation:

Ps(t)=  (∑_(r=1)^N Xtr* 1/√drs)/(∑_(r=1)^N 1/√drs)

Ps(t) – Probability that taxon t will occur at site s (300 sites s)
N – Number of sites = from 1 to 49
Xtr – Value for taxon t at site r (I have this information in a table, 40
taxa (columns) t, 49 sites r)
drs – Distance from site r to site s (this information is on a table, s
sites (columns)) 

I thought that R would be the software to use, but I am experiencing some
difficulties

Thanks to everyone,
P.Branco

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