Nothing
fitsoilwater3 <-
function (theta, x, xlab = NULL, ylab = NULL, ...)
{
if (!requireNamespace("rpanel", quietly = TRUE))
stop("package rpanel is required")
if (!inherits(c(theta, x), "numeric"))
stop("non-numeric arguments!")
if (length(theta) != length(x))
stop("incompatible dimensions!")
dat <- data.frame(theta, x)
if (is.null(xlab))
xlab = "Matric potential"
if (is.null(ylab))
ylab = "Soil water content"
f.graph <- function() {
plot(theta ~ x, data = dat, las = 1, xlab = xlab, ylab = ylab,
main = "Soil Water Retention Curve", ...)
}
f.graph()
theta_R <- a1 <- p1 <- a2 <- p2 <- NULL
f.panel <- function(pan) {
f.graph()
with(pan, curve(soilwater3(x, theta_R, a1, p1, a2, p2),
add = TRUE, col = "red"))
return(pan)
}
f.fit <- function(pan) {
start <- with(pan, pan[c("theta_R", "a1", "p1", "a2",
"p2")])
fit <- try(with(pan, nls(theta ~ soilwater3(x, theta_R,
a1, p1, a2, p2), data = dat, start = start)))
if (inherits(fit, "try-error")) {
rpanel::rp.messagebox("No convergence... try other initial values.",
title = "Warning!")
}
else {
f.graph()
est <- coef(fit)
curve(soilwater3(x, est[1], est[2], est[3], est[4],
est[5]), add = TRUE, col = "blue")
print(summary(fit))
print(Rsq(fit))
}
return(pan)
}
panel <- rpanel::rp.control("Interactive fit")
ran.t <- 2 * range(theta)
rpanel::rp.slider(panel, variable = theta_R, from = 0, to = max(theta),
resolution = 0.01, initval = 0.8 * min(theta), title = "theta_R",
action = f.panel)
rpanel::rp.doublebutton(panel, variable = theta_R, step = 0.01, title = "",
action = f.panel, showvalue = TRUE, foreground = "blue")
rpanel::rp.slider(panel, variable = a1, from = -0.5, to = 10, resolution = 0.01,
initval = 0.07, title = "a1", action = f.panel)
rpanel::rp.doublebutton(panel, variable = a1, step = 0.01, title = "",
action = f.panel, showvalue = TRUE, foreground = "blue")
rpanel::rp.slider(panel, variable = p1, from = 0, to = 15000, resolution = 5,
initval = 3670, title = "p1", action = f.panel)
rpanel::rp.doublebutton(panel, variable = p1, step = 1, title = "",
action = f.panel, showvalue = TRUE, foreground = "blue")
rpanel::rp.slider(panel, variable = a2, from = 0, to = 10, resolution = 0.01,
initval = 0.32, title = "a2", action = f.panel)
rpanel::rp.doublebutton(panel, variable = a2, step = 0.01, title = "",
action = f.panel, showvalue = TRUE, foreground = "blue")
rpanel::rp.slider(panel, variable = p2, from = 0, to = 1500, resolution = 5,
initval = 70, title = "p2", action = f.panel)
rpanel::rp.doublebutton(panel, variable = p2, step = 1, title = "",
action = f.panel, showvalue = TRUE, foreground = "blue")
rpanel::rp.button(panel, title = "NLS estimates", action = f.fit,
foreground = "white", background = "navy")
rpanel::rp.button(panel, title = "__________________ Quit __________________",
action = function(pan) return(pan), quitbutton = TRUE,
foreground = "red")
}
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