[R] Matrix or grid conversion of spatial data

[John Kane]

--- Marco Visser <visser_md at yahoo.com> wrote:

> Dear Happy R-users & experts,
> 
> I am in need of advice, 
> While working with spatial data (x & y coordinates
> of seed locations) I have come accross the problem
> that I need to convert my point data into a matrix
> or grid system. I then need to count how often a
> point falls into a certain position in the matrix or
> grid. I have searched all day online, asked
> collegeas but nothing works.
> 
> Sadly my R "box of tricks" has run out.
> 
> My (point) data looks like this;
> 
> x         y
> 2.3    4.5
> 3.4      0.2
> 
> and continues for another million records. 
> 
> Now my question; is there any function that is able
> to "count" how often a point falls into a grid based
> on the x and y location? So I need to discretize the
> spatial locations to a regular grid and then
> counting how often  a point occurs.
> 
> Many thanks for your thoughts on this problem.
> 
> Marco Visser

Would something like ?crossprod do it?
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