grf and RasterLayer

Do you know how I can have not fixed resolution in a RasterLayer?

?Hello.
I am pretty new to R and to geoR as well.


? A) I would like to implement an area of X*X ?km that would be used to
"Simulate" an

area map (eg. city's area, suburban area).

-X would be a parameter so I do not want it to be fixed
-In this map I would like to place users (people), thus I do not know in advance

if in one place there would be one,two, or more users..
-I would also like to not have fixed resolution in my map and specify it as a
parameter during run-time. In my X*X area I would like sometimes to have
resolution of 1Km and others resolution of 10 meters. As resolution increases (1

km->100m->10m) less users would be found in the same "place".

Do you know how I can have not fixed resolution in a RasterLayer?



? B)I also need some help regarding grf()

According to the geoR short manual grf() takes the following arguments



? ?* n number of points (spatial locations) in each simulations.
? ?* grid optional. An n ? 2 matrix with coordinates of the simulated data.
? ?* nx optional. Number of points in the X direction.
? ?* ny optional. Number of points in the Y direction.

What I want to create is a matrix (at least this is a matlab in matrix) that
contains values created from grf(). The array is of dimensions x*y so the grf()
needs to create a x*y map.

If you see the parameters again you will notice that there is a n (n number of
points) and nx and ny also.

If I put nx=400 and ny=200 (this is just an example) the grf() will return
values for 400 cells (for some reason picks the highest values of nx and ny). If
I try something like n=x*y I get the message that the RandomField package must
be used. Really do you what the parameter n is about (number of points))?

I would like to thank you in advance for your help

Best Regards
Alex.



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