growth_rate_curve: Function that creates a skewed sinusoidal growth rate (GR)...
In ShellChron: Builds Chronologies from Oxygen Isotope Profiles in Shells

Description Usage Arguments Value References Examples

Takes the specified parameters for amplitude, period, phase, average value and skewness factor as well as the number of years specified and the time interval. It then creates a skewed sinusoid based on the boundary conditions. The skewness factor (G_skw) determines whether the sinusoid is skewed towards the front (G_skw < 50) or the back of the annual peak in growth rate (G_skw > 50). Used as intermediate step during iterative modeling.

1	growth_rate_curve(G_par, years = 1, t_int = 1)

`G_par`	List of four parameters describing (in order) amplitude (`G_amp`; in micrometer/day), period (`G_per`; in days), phase (`G_pha` in day of the year), average growth rate (`G_av`; in micrometer/day) and the skewness factor (`G_skw` between 0 and 100)
`years`	Length of the preferred sinusoid in number of years (defaults to 1)
`t_int`	Time interval of sinusoidal record (in days)

A matrix containing columns for time (in days) and GR (in micrometer/day)

doi: 10.1016/j.palaeo.2017.09.034

# Set parameters
G_amp <- 20
G_per <- 365
G_pha <- 100
G_av <- 15
G_skw <- 70
G_par <- c(G_amp, G_per, G_pha, G_av, G_skw)
# Run GR model function
GR <- growth_rate_curve(G_par, 1, 1)