Nothing
see.M <- function ()
{
if (!exists("slider.env"))
slider.env <- NULL
suppressWarnings(rm(slider.env))
slider.env <<- new.env()
cval <- 0
assign("cval", tclVar(cval), envir = slider.env)
xmin <- -5
assign("xmin", tclVar(xmin), envir = slider.env)
xmax <- 5
assign("xmax", tclVar(xmax), envir = slider.env)
norm.refresh <- function(...) {
cval <- as.numeric(evalq(tclvalue(cval), envir = slider.env))
xmin <- as.numeric(evalq(tclvalue(xmin), envir = slider.env))
xmax <- as.numeric(evalq(tclvalue(xmax), envir = slider.env))
xx <- seq(xmin, xmax, length = 500)
yy <- sapply(xx, function(x) {
min(1, cval/abs(x))
})
dev.hold()
p <- plot(xx, yy, type = "l", xlim = c(xmin, xmax), ylab = "Weight",
xlab = expression(paste(italic(x), " - ", hat(mu))),
lwd = 2, bty = "l")
grid(p)
legend("topright", legend = bquote(paste(italic(c)," = ", .(cval), sep = "")), box.col = "white",
bg = "white")
dev.flush()
}
tclServiceMode(TRUE)
m <- tktoplevel()
tkwm.title(m, "Visualizing M-estimation of location")
tkwm.geometry(m, "+0+0")
tkpack(fr <- tkframe(m), side = "top")
tkpack(tklabel(fr, text = "c", width = "20"), side = "right")
tkpack(sc <- tkscale(fr, command = norm.refresh, from = 0.01,
to = 5, orient = "horiz", resolution = 0.01, showvalue = TRUE),
side = "left")
assign("sc", sc, envir = slider.env)
evalq(tkconfigure(sc, variable = cval), envir = slider.env)
tkpack(fr <- tkframe(m), side = "top")
tkpack(tklabel(fr, text = "Xmin:", width = 6), side = "left")
tkpack(e <- tkentry(fr, width = 8), side = "left")
assign("e", e, envir = slider.env)
evalq(tkconfigure(e, textvariable = xmin), envir = slider.env)
tkpack(tklabel(fr, text = "Xmax:", width = 6), side = "left")
tkpack(e <- tkentry(fr, width = 8), side = "left")
assign("e", e, envir = slider.env)
evalq(tkconfigure(e, textvariable = xmax), envir = slider.env)
tkpack(tkbutton(m, text = "Refresh", command = norm.refresh),
side = "left")
tkpack(tkbutton(m, text = "Exit", command = function() tkdestroy(m)),
side = "right")
}
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