nlraa (version 1.2)

SStemp3: 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)

Value

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

Arguments

x

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

t.m

medium temperature

t.l

low temparature

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

Examples

# \donttest{
## 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)))
# }