sim_vonB function

Closure for simulating length given age using von Bertalanffy notation

This function outputs a function which holds the parameter values supplied and the function either simulates lengths given ages or generates a length age key give a sequence of ages.

sim_vonB(
  Linf = 120,
  L0 = 5,
  K = 0.1,
  log_sd = 0.1,
  length_group = 3,
  digits = 0,
  plot = FALSE
)

Arguments

• Linf: Mean asymptotic length
• L0: Length at birth
• K: Growth rate parameter
• log_sd: Standard deviation of the relationship in log scale
• length_group: Length group for length age key. Note that labels on the matrix produced are midpoints using the DFO conventions; see group_lengths. Also note that this length group will dictate the length group used in the stratified analysis run by run_strat.
• digits: Integer indicating the number of decimal places to round the values to
• plot: Produce a simple plot of the simulated values?

Returns

Returns a function for use inside sim_abundance.

Examples

growth_fun <- sim_vonB(Linf = 100, L0 = 5, K = 0.2, log_sd = 0.05, length_group = 1, plot = TRUE)
growth_fun(age = rep(1:15, each = 100))
growth_fun(age = 1:15, length_age_key = TRUE)
sim_abundance(growth = sim_vonB(plot = TRUE))