validGearParams()handle NAs more gracefully and check that there are no duplicates.
upgradeParams()works also on params objects that were created with a development version of mizer.
upgradeParams()does a better job at guessing the value for
steady()now work also when model has extra components.
plotFeedinglevel()when called with
include_critical = TRUE, see #162.
species_paramsis a tibble.
getDiet()also takes into account possible contributions by user-defined other components.
project()is called with
t_max < t_savethen
t_saveis automatically reduced so that the result at
t_maxwill get saved.
project_simple()that projects a given number of time steps. This might be useful to extension writers.
project()is passed on to the dynamics and rate functions.
steady()runs faster by using
Some inconsistencies in the choice of names for parameters was removed by renaming
This is a major new release with many new features, an internal refactoring of the code and a new extension mechanism.
Nevertheless this version of mizer is almost fully backwards compatible with version 1.0 with the exception of bug fixes and the following breaking changes:
print_itargument from plot functions.
all.sizes = TRUE.
sex_ratioargument has been removed from
set_scaling_model()function has been removed because such models can now be set up with
newTraitParams()with the options
perfect_scaling = TRUEand
egg_size_scaling = TRUE.
retuneAbundance()have been removed to the “mizerExperimental” package (https://sizespectrum.org/mizerExperimental)
project()a progress bar is displayed by default. You can turn this off with the option `progress_bar = FALSE.
The new functions
replace the old functions
MizerParams(), which are now deprecated. The new functions choose better default values, in particular for metabolic rate and maximum intake rate.
After setting up a mizer model, it is possible to change specific model parameters with the new functions
The documentation for these functions serves to explain the details of the mizer model.
Along with these setter functions there are accessor functions for getting the parameter arrays:
The MizerParams object now also contains the initial values for the size spectra. This is particularly useful if the model has been tuned to produce the observed steady state. The new function
steady() finds a steady state for a model and sets it as the initial value. The initial values can be accessed and changed via functions
initialNResource(). The initial values can be set to the final values of a previous simulation with
The MizerParams object now has a slot
initial_effort that specifies the initial fishing effort to which the steady state has been calibrated.
Mizer now has an extension mechanism that allows other R packages to be written to generalise the mizer model. See
setComponent(). This mechanism is still experimental and may change as we gain experience in writing extensions for mizer.
plotlyBiomass()as the plotly version of
plotBiomass(), and so on.
plotGrowthCurves()plots growth curves and compares them to the von Bertalanffy growth curve.
plotDiet()plots the diet composition as a function of predator size.
highlightargument to all plot functions that display curves for multiple species. Displays highlighted species with wider lines.
plot()method for MizerParams object to plot the initial state.
plotFeedingLevel()allows to show also the critical feeding level.
plotSpectra()in analogy to the existing
ylimargument to limit the w range in the plot.
solidbut this can be changed via the
box_pred_kernel()implements a box-shaped kernel as an alternative to the default
power_law_pred_kernel()implements a power-law kernel with sigmoidal cutoffs at both ends. This is suitable for filter feeders.
setPredKernel()). Mizer automatically falls back on the old non-FFT code to handle this. (#41)
getPredKernel()returns the full 3-dimensional predation kernel array, even when this is not stored in MizerParams object.
upgradeSim()can upgrade objects from previous versions of mizer so they work with the new version.
getDiet()calculates the diet of predators. (#43)
SheperdRDD()for density-dependence in reproduction, as well as
double_sigmoid_length()allows modelling of escape of large individuals.
sigmoidal_weight()is weight-based trawl selectivity function. (Ken H Andersen)
getGrowthCurves()calculates the growth curves (size at age).
mizerRates()calculates all the rates needed in the model and collects them in a list.
times()to extract the times at which simulation results are saved in a MizerSim object.
finalNOther()as well as
idxFinalT()to access the values at the final time of a simulation.
getCriticalFeedingLevel()returns the critical feeding level for each species at each size.
melt()function from the reshape2 package which allows users to convert the arrays returned by mizer functions into data frames that can be used for example in ggplot2 and plotly.
validSpeciesParams()checks validity of species parameter data frame and sets defaults for missing but required parameters.
qas well as the feeding level
f0can now be set at the species level via columns in
fccan now be specified as a species parameter and will be used to calculate the metabolic rate parameter
ksif it is not supplied.
project()now shows a progress bar while a simulation is running. Can be turned off with
progress_bar = FALSEargument.
interaction_resourcecolumn in the species parameter data frame.
w_mat25column in the species parameter dataframe, which gives the size at which 25% of the individuals of a species are mature.
mcolumn in the species parameter data frame.
project()can now continue projection from last time step of a previous simulation if the first argument is a MizerSim object. The new
appendargument then controls whether the new results are appended to the old.
n_otherarguments from the initial values in the
newTraitParams()to produce a perfectly scale-invariant model.
newTraitParams()allows the inclusion of external mortality.
NS_paramswith the North Sea model MizerParams object.
getSSB(), the calculation of the spawning stock biomass is done correctly using the maturity ogive instead of the proportion of energy allocated to reproduction. (#47)
getPredRate()now set names on the returned arrays.
ylimargument is not handled correctly in plots.
display_frame()is now exported.
summary()of MizerParams object reflects the number of non-empty resource bins. (@patricksykes)
get_ks_default(), making it easier to change or extend these in the future.
set_species_param_default()makes it easier to set default values for species parameters.
@inheritfunctionality of roxygen2 to reduce duplication in roxygen documentation.
getPhiPrey()is replaced by
getEncounter()which now returns the full encounter rate, including the contribution from other components. Even in the absence of other components,
getEncounter()differs from the old
getPhiPrey()because it includes the search volume factor.
paramsto refer to an argument of class MizerParams,
simto refer to an argument of class MizerSim, and
objectto an argument that can be either.
setClass()to follow the new guidelines, replacing
progress_barbecause they control any type of progress bar.
tapply()where possible to improve readability.
anyNA()because they were not available in R 3.1
@activityslots into a single
@species_paramsinto its own slot.
@maturityto hold the maturity ogive.
@pred_kernelto hold predation kernel if it has variable predator/prey ratio.
@resource_dynamicsto allow user to specify alternative resource dynamics.
@gear_dynamicsto species to be targeted by multiple gears.
@ft_maskthat is used when calculating predation rates using the Fourier transform method.
@rates_funcsto allow mizer extensions to replace mizer rate functions with their own rate functions.
@srrwe now have the name of the function in
@rate_funcs$RDD, see #91.
@initial_n_otherto allow mizer extensions to add more ecosystem components.
set_scaling_model(), see section 12 in the vignette.
PlotYield()no longer fails when species names are numbers or when a species abundance is zero
totalparameter to several plot functions to add the curve for the total community (sum over all species and resource)
speciesparameter to all plot functions to allow for only a selection of species to be plotted
@initial_n_ppslots to MizerParams class.