Nothing
# Visualize Whittaker smoother
demo.discreteSmo <- function(y=NULL,...)
{
whitsm = function(y, lambda = 10, d = 2)
{
m <- length(y)
E <- diag(m)
D <- diff(E, diff = d)
z <- solve(E + lambda * t(D) %*% D, y)
return(z)
}
# Simulate data
if (is.null(y))
{
n <- 100
x <- seq(0, 1, length = n)
set.seed(123)
y <- 1.2 + sin(5 * x) + rnorm(n) * 0.2
}
else
{
y <- y
x <- seq(1, length(y), step=1)
}
order <- 2
lla <- 1
if (interactive())
{
ws.smooth = function(panel)
{
lla <- panel$lla
order <- panel$order
lambda <- 10 ^ lla
z <- whitsm(y, lambda, order)# gamlss(y~rw(1))
tl <- paste('Whittaker smoothing; order = ', order, ', log10(lambda) = ', lla, sep = '')
plot(x, y, type = 'l', xlab = '', ylab = '', lwd = 1.5, main = tl, ...)
lines(x, z, col = 'red', lty = 1, lwd = 3)
panel
}
ws.panel = rp.control('Whittaker', lla = 1)
rp.slider(ws.panel, var = lla, from = -2, to = 10, action = ws.smooth, resolution = 0.1, showvalue = T, title = 'Set log10(lambda)')
rp.doublebutton(ws.panel, var = order, action = ws.smooth, initval = 2, step = 1, range = c(1, 4), showvalue = T, "Order")
}
}
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