getFeedingLevel method for the size based model

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Description

Calculates the amount of food consumed by a predator by predator size based on food availability, search volume and maximum intake. This method is used by the project method for performing simulations.

Arguments

object

A MizerParams or MizerSim object

n

A matrix of species abundance (species x size). Only used if object argument is of type MizerParams.

n_pp

A vector of the background abundance by size. Only used if object argument is of type MizerParams.

phi_prey

The PhiPrey matrix (optional) of dimension no. species x no. size bins. If not passed in, it is calculated internally using the getPhiPrey() method. Only used if object argument is of type MizerParams.

time_range

Subset the returned fishing mortalities by time. The time range is either a vector of values, a vector of min and max time, or a single value. Default is the whole time range. Only used if the object argument is of type MizerSim.

drop

should extra dimensions of length 1 in the output be dropped, simplifying the output. Defaults to TRUE

Note

If a MizerParams object is passed in, the method returns a two dimensional array (predator species x predator size) based on the abundances also passed in. If a MizerSim object is passed in, the method returns a three dimensional array (time step x predator species x predator size) with the feeding level calculated at every time step in the simulation.

See Also

getPhiPrey

Examples

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## Not run: 
data(NS_species_params_gears)
data(inter)
params <- MizerParams(NS_species_params_gears, inter)
# With constant fishing effort for all gears for 20 time steps
sim <- project(params, t_max = 20, effort = 0.5)
# Get the feeding level at one time step
n <- sim@n[21,,]
n_pp <- sim@n_pp[21,]
fl <- getFeedingLevel(params,n,n_pp)
# Get the feeding level at all saved time steps
fl <- getFeedingLevel(sim)
# Get the feeding level for time 15 - 20
fl <- getFeedingLevel(sim, time_range = c(15,20))

## End(Not run)

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