[R] 2d rndom walk

[David Winsemius]

On Jun 29, 2011, at 6:01 AM, Komal wrote:

> Hi all,
>
> Can anyone please tell me how to calculate the expected distance  
> covered in
> a 2d random walk. Please!

If  the "2d random walk" is the binomial version you were looking at  
in Jim Holtmans' function from Dec 2010 on a 2D lattice, would it be  
trivially (and with zero variance) either t*2 or t*sqrt(2) depending  
on whether you define the term "distance travelled" by the edges of  
successive squares or by their diagonals?

-- 

David Winsemius, MD
West Hartford, CT