Obtain von Bertalanffy growth increments
Usage
get_growth_increment_vb(
midpoint = seq(31, 91, 2),
linf = 120,
k = 0.1,
gcv = 0.5,
gobs = 1,
gdd = 0,
gmin = 0.01,
biomass = 1,
tau = 1
)Arguments
- midpoint
a
numericvector of length bin midpoints (mm).- linf
the von Bertalanffy asymptotic length parameter \(L_{\infty}\) (mm).
- k
the von Bertalanffy growth rate parameter \(K\) (per year).
- gcv
the process error parameter \(G_{CV}\) as a coefficient of variation.
- gobs
the observation error parameter \(G_{obs}\) (mm).
- gdd
the density-dependence parameter affecting growth.
- gmin
the minimum standard deviation of growth increment (mm).
- biomass
the biomass used for density-dependent growth calculations.
- tau
the time at liberty (years).
Value
a list containing a vector of growth increments and a vector of the standard deviation for each increment.
Examples
get_growth_increment_vb()
#> $gi
#> [1] 8.469470 8.279145 8.088819 7.898494 7.708169 7.517844 7.327519 7.137194
#> [9] 6.946868 6.756543 6.566218 6.375893 6.185568 5.995243 5.804917 5.614592
#> [17] 5.424267 5.233942 5.043617 4.853292 4.662967 4.472641 4.282316 4.091991
#> [25] 3.901666 3.711341 3.521016 3.330690 3.140365 2.950040 2.759715
#>
#> $sigma
#> [1] 4.351204 4.258645 4.166203 4.073886 3.981704 3.889665 3.797780 3.706060
#> [9] 3.614518 3.523169 3.432026 3.341108 3.250432 3.160021 3.069897 2.980086
#> [17] 2.890617 2.801524 2.712843 2.624616 2.536890 2.449720 2.363167 2.277300
#> [25] 2.192202 2.107964 2.024694 1.942517 1.861578 1.782045 1.704114
#>