Tamas,
You could write convenience functions, but I have used the C99 mechanism
for variable length arrays with no problems calling from R. One thing
you have to keep in mind though is that (as far as I know) the
dimensions must be passed before the array reference. So for example,
r <- .C("foo",
as.integer(ni),
as.integer(nj),
x = double(ni * nj),
...)
with your function defined as
void foo(int *ni, int *nj, double x[*ni][*nj])
{
...
Then in C you can access elements of x via x[3][4], for example.
Ben
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