Internal helper holding the arithmetic shared by getFlux.MizerParams and
getFlux.MizerSim. Keeping it separate lets the MizerSim method resolve the
rate functions once and reuse them across all saved time steps.
flux_from_rates(params, n, g, d, rdd, power = 0)A plain species x size matrix of fluxes (no mizer array class).
A valid MizerParams object.
A matrix of species abundances (species x size).
Growth rate matrix (species x size), as from getEGrowth().
Diffusion rate matrix (species x size), as from getDiffusion().
Density-dependent reproduction rate vector (one per species), as
from getRDD().
The flux at weight \(w\) is multiplied by \(w\) raised to
power. The default power = 0 leaves the flux of individuals unchanged.