exp3: Parallel or double first order exponential

In nlraa: Non-linear regression for agricultural applications

Description

Parallel or double first order exponential. This is equation 1.3 in Table S.1 referenced in the paper below.

Usage

exp3(time, Yo, rate1, rate2, fraction)

Arguments

time	a numeric vector of values at which to evaluate the model.
Yo	a numeric parameter representing the asymptote.
rate1	first rate
rate2	second rate
fraction	Fraction (0-1) which determines the size of each pool

Value

a numeric vector of length equal to the inputs

Author(s)

Fernando E. Miguez Sotiris Archontoulis

References

Nonlinear Regression Models and Applications in Agricultural Research. Sotirios V. Archontoulis and Fernando E. Miguez. Agronomy Journal. doi: 10.2134/agronj2012.0506

Examples

require(lattice)
## Set parameter values and plot the relationship
time <- seq(0, 100,5)
ans1 <- exp3(time, Yo=1, rate1=0.01, rate2=0.05, fraction=0.3)
ans2 <- exp3(time, Yo=1, rate1=0.01, rate2=0.05, fraction=0.1)
ans3 <- exp3(time, Yo=1, rate1=0.01, rate2=0.05, fraction=0.9)
xyplot(ans1 + ans2 + ans3 ~ time, type="l", auto.key=TRUE, ylab = "text", xlab = "time")

nlraa documentation built on May 2, 2019, 5 p.m.