run_biocro {BioCro}

Simulate Crop Growth with BioCro

Description

Runs a full crop growth simulation using the BioCro framework

Usage

  run_biocro(
      initial_values = list(),
      parameters = list(),
      drivers,
      direct_module_names = list(),
      differential_module_names = list(),
      ode_solver = BioCro::default_ode_solvers$homemade_euler,
      verbose = FALSE
  )

Arguments

initial_values

A list of named quantities representing the initial values of the differential quantities, i.e., the quantities whose derivatives are calculated by differential modules

parameters

A list of named quantities that don't change with time; must include a 'timestep' parameter (see 'drivers' for more info)

drivers

A data frame of quantities defined at equally spaced time intervals. The time interval should be specified in the 'parameters' as a quantity called 'timestep' having units of hours. The drivers must include columns for either (1) 'time' (in units of days) or (2) 'doy' and 'hour'.

direct_module_names

A character vector or list of the fully-qualified names of the direct modules to use in the system; lists of available modules can be obtained via the get_all_modules function.

differential_module_names

A character vector or list of the fully-qualified names of the differential modules to use in the system; lists of available modules can be obtained via the get_all_modules function.

ode_solver

A list specifying details about the numerical ODE solver. The required elements are:

• type: A string specifying the name of the algorithm to use; a list of available options can be obtained using the get_all_ode_solvers function.

• output_step_size: The output step size. If smaller than 1, it should equal 1.0 / N for some integer N. If larger than 1, it should be an integer.

• adaptive_rel_error_tol: used to set the relative error tolerance for adaptive step size methods

• adaptive_abs_error_tol: used to set the absolute error tolerance for adaptive step size methods

• adaptive_max_steps: determines how many times an adaptive step size method will attempt to find a new step size before indicating failure

verbose

A logical variable indicating whether or not to print dynamical system validation information. (More detailed startup information can be obtained with the validate_dynamical_system_inputs function.)

Details

run_biocro is the most important function in the BioCro package. The input arguments to this function are used to define a dynamical system and solve for its time evolution during a desired time period. For more details about how this function operates, see Lochocki et al. (2022) [doi:10.1093/insilicoplants/diac003].

When using one of the pre-defined crop growth models, it may be helpful to use the with command to pass arguments to run_biocro; see the documentation for crop_model_definitions for more information.

Value

A data frame where each column represents one of the quantities included in the simulation (with the exception of the parameters, since their values are guaranteed to not change with time) and each row represents a time point

See Also

• get_all_modules

• get_all_ode_solvers

• validate_dynamical_system_inputs

• partial_run_biocro

Examples

# Example: running a miscanthus simulation using weather data from 2005
result <- run_biocro(
  miscanthus_x_giganteus$initial_values,
  miscanthus_x_giganteus$parameters,
  get_growing_season_climate(weather$'2005'),
  miscanthus_x_giganteus$direct_modules,
  miscanthus_x_giganteus$differential_modules,
  miscanthus_x_giganteus$ode_solver
)

lattice::xyplot(
  Leaf + Stem + Root + Grain ~ TTc,
  data=result,
  type='l',
  auto=TRUE
)