SStemp: self start for Collatz temperature response

In nlraa: Nonlinear Regression for Agricultural Applications

self start for Collatz temperature response

Description

Self starter for Collatz temperature response function

Usage

temp3(x, t.m, t.l, t.h)

SStemp3(x, t.m, t.l, t.h)

Arguments

x	input vector (x) which is normally ‘temperature’.
t.m	medium temperature
t.l	low temperature
t.h	high temperature

Details

Collatz GJ , Ribas-Carbo M Berry JA (1992) Coupled Photosynthesis-Stomatal Conductance Model for Leaves of C4 Plants. Functional Plant Biology 19, 519-538. https://doi.org/10.1071/PP9920519

Value

temp3: vector of the same length as x using a temp function

Examples

## A temperature response function
require(ggplot2)
set.seed(1234)
x <- 1:50
y <- temp3(x, 25, 13, 36) + rnorm(length(x), sd = 0.05)
dat1 <- data.frame(x = x, y = y)
fit1 <- nls(y ~ SStemp3(x, t.m, t.l, t.h), 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.