SSscard3: self start for smooth cardinal temperature response

SSscard3R Documentation

self start for smooth cardinal temperature response

Description

Self starter for smooth cardinal temperature response function

Usage

scard3(x, tb, to, tm, curve = 2)

SSscard3(x, tb, to, tm, curve = 2)

Arguments

x

input vector (x) which is normally ‘temperature’.

tb

base temperature

to

optimum temperature

tm

maximum temperature

curve

curvature (default is 2)

Details

An example application can be found in (doi:10.1016/j.envsoft.2014.04.009)

This function is described in Archontoulis and Miguez (2015) - (doi:10.2134/agronj2012.0506) - Equation 5.1 in Table 1.

Value

scard3: vector of the same length as x using a scard3 function

Author(s)

Caio dos Santos and Fernando Miguez

Examples


## A temperature response function
require(ggplot2)
set.seed(1234)
x <- 1:50
y <- scard3(x, 13, 25, 36) + rnorm(length(x), sd = 0.05)
dat1 <- data.frame(x = x, y = y)
fit1 <- nls(y ~ SSscard3(x, tb, to, tm), data = dat1)

ggplot(data = dat1, aes(x, y)) + 
  geom_point() + 
  geom_line(aes(y = fitted(fit1)))


nlraa documentation built on May 29, 2024, 2:01 a.m.