A proposal: dotchart() should accept xlim.
Below my additions and changes (marked with "NEW") to the function.
Regards
Wolfram
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dotchart <-
function (x, labels = NULL, groups = NULL, gdata = NULL, cex =
par("cex"),
pch = 21, gpch = 21, bg = par("bg"), color = par("fg"),
gcolor = par("fg"),
lcolor = "gray", main = NULL, xlab = NULL, ylab = NULL,
#--- NEW ---
xlim = range(x[is.finite(x)]),
#---
...)
{
opar <- par("mar", "cex", "yaxs")
on.exit(par(opar))
par(cex = cex, yaxs = "i")
n <- length(x)
if (is.matrix(x)) {
if (is.null(labels))
labels <- rownames(x)
if (is.null(labels))
labels <- as.character(1:nrow(x))
labels <- rep(labels, length = n)
if (is.null(groups))
groups <- col(x, as.factor = TRUE)
glabels <- levels(groups)
}
else {
if (is.null(labels))
labels <- names(x)
if (!is.null(groups))
glabels <- levels(groups)
else glabels <- NULL
}
plot.new()
linch <- 0
ginch <- 0
if (!is.null(labels))
linch <- max(strwidth(labels, "inch"), na.rm = TRUE)
goffset <- 0
if (!is.null(glabels)) {
ginch <- max(strwidth(glabels, "inch"), na.rm = TRUE)
goffset <- 0.4
}
lheight <- strheight("M", "inch")
if (!(is.null(labels) && is.null(glabels))) {
nmar <- mar <- par("mar")
nmar[2] <- nmar[4] + (max(linch + goffset, ginch) + 0.1)/lheight
par(mar = nmar)
}
if (is.null(groups)) {
o <- 1:n
y <- o
ylim <- c(0, n + 1)
}
else {
o <- sort.list(as.numeric(groups), decreasing = TRUE)
x <- x[o]
groups <- groups[o]
color <- rep(color, length = length(groups))[o]
lcolor <- rep(lcolor, length = length(groups))[o]
offset <- cumsum(c(0, diff(as.numeric(groups)) != 0))
y <- 1:n + 2 * offset
ylim <- range(0, y + 2)
}
#--- NEW ---
plot.window(xlim = xlim, ylim = ylim, log = "")
#--- ORIGINAL ---
# plot.window(xlim = range(x[is.finite(x)]), ylim = ylim, log = "")
#---
xmin <- par("usr")[1]
if (!is.null(labels)) {
linch <- max(strwidth(labels, "inch"), na.rm = TRUE)
loffset <- (linch + 0.1)/lheight
labs <- labels[o]
for (i in 1:n) mtext(labs[i], side = 2, line = loffset,
at = y[i], adj = 0, col = color, las = 2, cex = cex,
...)
}
abline(h = y, lty = "dotted", col = lcolor)
points(x, y, pch = pch, col = color, bg = bg)
if (!is.null(groups)) {
gpos <- rev(cumsum(rev(tapply(groups, groups, length)) +
2) - 1)
ginch <- max(strwidth(glabels, "inch"), na.rm = TRUE)
goffset <- (max(linch + 0.2, ginch, na.rm = TRUE) + 0.1)/lheight
for (i in 1:nlevels(groups)) mtext(glabels[i], side = 2,
line = goffset, at = gpos[i], adj = 0, col = gcolor,
las = 2, cex = cex, ...)
if (!is.null(gdata)) {
abline(h = gpos, lty = "dotted")
points(gdata, gpos, pch = gpch, col = gcolor, bg = bg,
...)
}
}
axis(1)
box()
title(main = main, xlab = xlab, ylab = ylab, ...)
invisible()
}
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