[R] Clarks 2Dt function in R

[bialozyt at biologie.uni-marburg.de]

Dear Ben,

you answerd to Nancy Shackelford about Clarks 2Dt function.
Since the thread ended just after your reply,
I would like to ask, if you have an idea how to use this function in R

I defined it the following way:

function(x , p, u) {
  (p/(pi*u))*(1+(x^2/u))^(p+1)
}

and would like to fit this one to my obeservational data (count)

       [,1] [,2]
 [1,]   15   12
 [2,]   45   13
 [3,]   75   10
 [4,]  105    8
 [5,]  135   16
 [6,]  165    5
 [7,]  195   15
 [8,]  225    8
 [9,]  255    9
[10,]  285   12
[11,]  315    5
[12,]  345    4
[13,]  375    1
[14,]  405    1
[15,]  435    1
[16,]  465    0
[17,]  495    1
[18,]  525    2
[19,]  555    0
[20,]  585    0
[21,]  615    0
[22,]  645    0
[23,]  675    0

but I am not able to fit anything.
Do you have an idea?
I guess there is something wrong in my formula for Clarks 2Dt

Thank you for reading 

Ciao
Ronald Bialozyt