SScard3: self start for cardinal temperature response

In nlraa: Nonlinear Regression for Agricultural Applications

self start for cardinal temperature response

Description

Self starter for cardinal temperature response function

Usage

card3(x, tb, to, tm)

SScard3(x, tb, to, tm)

Arguments

x	input vector (x) which is normally ‘temperature’.
tb	base temperature
to	optimum temperature
tm	maximum temperature

Details

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

Value

card3: vector of the same length as x using a card3 function

Author(s)

Caio dos Santos and Fernando Miguez

Examples

## A temperature response function
require(ggplot2)
set.seed(1234)
x <- 1:50
y <- card3(x, 13, 25, 36) + rnorm(length(x), sd = 0.05)
dat1 <- data.frame(x = x, y = y)
fit1 <- nls(y ~ SScard3(x, tb, to, tm), data = dat1)

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

nlraa documentation built on July 9, 2023, 6:08 p.m.