R help - Jun 2013 - How to cast a numeric argument to a two-dimensional array in an inline C function?

Hello --

For convenience, I would like to use a two dimensional array 
inside an inline C function. However, any numeric array in R 
is passed to C code as double *. So, how can I cast a (double 
*) to a double[][]?

thank you for your time, 

Mikhail

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