Allow feeding kernel to be kept in MizerParams object even when using FFT method about mizer HOT 4 CLOSED

The full feeding kernel would be useful for cases where species are expected to have variable PPMR with size. This applies to planktivorous fish, that feed on small prey even when they grow large. Same is true for many coastal benthivorous fish, which are dominant species in e.g. Tasmanian coastal model.
The method we are trying to implement is published in Heneghan et al. 2016 (http://journal.frontiersin.org/article/10.3389/fmars.2016.00201/abstract) and only requires one extra parameter m. The code is more or less implemented in https://github.com/astaaudzi/mizer-rewiring (although the final version has not been pushed yet). We are just waiting for the resolution on the differences between different integration method for the feeding kernel (issue #39)

from mizer.

@astaaudzi this issue is specifically about keeping the feeding kernel around also when the PPMR is not variable. When the PPMR is variable, then of course the feeding kernel needs to be kept around because it is then needed to calculate the feeding and mortality rates because the FFT method can not be used. I will therefore split your comment into a new issue #41

from mizer.

Yes, I agree.
@reum has developed useful codes and plots to track diets across species and sizes, where the full kernel is useful (although diet composition plots might be a yet another issue? :) )

from mizer.

You can now keep the feeding kernel around by passing store_kernel = TRUE to MizerParams. By default the kernel is kept when there are 100 or fewer size bins.

from mizer.