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## ----plot-concavities, fig.align="center", fig.width = 7, fig.height = 5, echo = FALSE----
e <- 0:15
IWTotal <- function (k) e / (e + k)
IW <- function (k) {
iwTotal <- IWTotal(k)
iwStep <- iwTotal[-1] - iwTotal[-length(e)]
iwStep / max(iwStep)
}
IWPoints <- function (k, n) {
points(IW(k) ~ e[-1], type = "b", col = n, pch = 2, lty = 2)
}
plot(e[-1], e[-1], type = "n", frame.plot = FALSE,
xlab = "Extra step",
ylab = "Relative cost of this extra step",
ylim = c(0, 1))
k <- c(3, 10, 30)
for (i in seq_along(k)) IWPoints(k[i], i)
PP <- function (a, col, n = 40) {
char <- rep(0:1, c(a, n - a))
si <- TreeSearch::StepInformation(char)
points(I(si / max(si)) ~ I(seq_along(si)), type = "b", col = col, pch = 1)
}
p <- c(3, 8, 20)
for (i in seq_along(p)) PP(p[i], i + 3)
legend("topright", col = 1:6, lty = c(rep(2, 3), rep(1, 3)),
pch = c(rep(2, 3), rep(1, 3)),
bty = "n", cex = 0.9,
c(paste0("IW, k = ", k),
paste0("PP, ", p, " | ", 40 - p)))
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