Nothing
see.mnom.tck <- function ()
{
old.par <- par(no.readonly = TRUE)
if (!exists("slider.env"))
slider.env <- NULL
suppressWarnings(rm(slider.env))
slider.env <<- new.env()
n <- 10
p1 <- 0.5
assign("n", tclVar(n), envir = slider.env)
assign("p1", tclVar(p1), envir = slider.env)
norm.refresh <- function(...) {
n <- as.numeric(evalq(tclvalue(n), envir = slider.env))
p1 <- as.numeric(evalq(tclvalue(p1), envir = slider.env))
p2 <- 1 - p1
x1 <- seq(0, n); x2 <- n - x1
z <- dbinom(x1, n, p1)
dev.hold()
par(mar = c(5,4,0,2))
scatterplot3d(x = x1, y = x2, z = z, type = "h", zlab = expression(paste(italic(f),"(",italic(y)[1],",",italic(y)[2],")", sep = "")), xlab = expression(italic(y)[1]), ylab = expression(italic(y)[2]), xlim = c(0,20), ylim= c(0,20), pch=19, cex.symbols=.8, box = FALSE)
mtext(bquote(paste(italic(Y)[1],", ",italic(Y)[2], " ~ ", italic(MNOM), "(",
.(n), ", ", .(p1), ", ", .(1-p1),")", sep = "")), line = -3, side = 3)
dev.flush()
}
tclServiceMode(TRUE)
m <- tktoplevel()
tkwm.title(m, "MNOM(n, \u03C0\u2081, \u03C0\u2082)")
tkpack(tklabel(m, text = " Visualizing the Multinomial Distribution "))
tkwm.geometry(m, "+0+0")
tkpack(fr <- tkframe(m), side = "top")
tkpack(tklabel(fr, text = "n", font = c("Helvetica", "9",
"italic"), width = "20"), side = "right")
tkpack(sc <- tkscale(fr, command = norm.refresh, from = 1,
to = 20, orient = "horiz", resolution = 1, showvalue = TRUE),
side = "left")
assign("sc", sc, envir = slider.env)
evalq(tkconfigure(sc, variable = n), envir = slider.env)
tkpack(fr <- tkframe(m), side = "top")
tkpack(tklabel(fr, text = "\u03C0\u2081", width = "20"), side = "right")
tkpack(sc <- tkscale(fr, command = norm.refresh, from = 0,
to = 1, orient = "horiz", resolution = 0.01, showvalue = TRUE),
side = "left")
assign("sc", sc, envir = slider.env)
evalq(tkconfigure(sc, variable = p1), envir = slider.env)
tkpack(tkbutton(m, text = "Refresh", command = norm.refresh),
side = "left")
tkpack(tkbutton(m, text = "Exit", command = function() tkdestroy(m)),
side = "right")
on.exit(par(old.par))
}
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