The predation kernel depends only on the predator/prey mass ratio, so on the
geometric grid it is a function of the offset \(m\) between the predator
and prey grid indices alone. phis[i, m + 1] holds the weight of species
\(i\) at offset \(m\). This helper writes those weights into the
(predator species x predator size x prey size) array that the non-FFT code
paths work with.
expand_kernel_offsets(phis, params, species)An array (predator species x predator size x prey size).
A species-by-offset matrix of kernel weights, with the offset
running from 0 to length(params@w_full) - 1.
A MizerParams object supplying the grid.
A character vector of species names for the dimnames.