parvin karimi -4 years ago 56
R Question

# Is there a way in a R `dotchart()` to supress x-axis?

I was wondering if there is any way to suppress x-axis from being drawn in the

`dotchart()`
in R?

Here is a
`dotchart()`
example:

``````groups = factor( rep(1:2, times = c(5, 15) ) )
dotchart(rnorm(20), groups = groups)
``````

Looking inside the `dotchart` function, one can see in the last rows the `axis(1)` command, which adds the x-axis to the plot.
A simple solution is to create a modified copy of the `dotchart` function as follows:

``````mydotchart <- function (x, labels = NULL, groups = NULL, gdata = NULL, cex = par("cex"),
pt.cex = cex, pch = 21, gpch = 21, bg = par("bg"), color = par("fg"),
gcolor = par("fg"), lcolor = "gray", xlim = range(x[is.finite(x)]),
main = NULL, xlab = NULL, ylab = NULL, ...)
{
opar <- par("mai", "mar", "cex", "yaxs")
on.exit(par(opar))
par(cex = cex, yaxs = "i")
if (!is.numeric(x))
stop("'x' must be a numeric vector or matrix")
n <- length(x)
if (is.matrix(x)) {
if (is.null(labels))
labels <- rownames(x)
if (is.null(labels))
labels <- as.character(1L:nrow(x))
labels <- rep_len(labels, n)
if (is.null(groups))
groups <- col(x, as.factor = TRUE)
glabels <- levels(groups)
}
else {
if (is.null(labels))
labels <- names(x)
glabels <- if (!is.null(groups))
levels(groups)
if (!is.vector(x)) {
warning("'x' is neither a vector nor a matrix: using as.numeric(x)")
x <- as.numeric(x)
}
}
plot.new()
linch <- if (!is.null(labels))
max(strwidth(labels, "inch"), na.rm = TRUE)
else 0
if (is.null(glabels)) {
ginch <- 0
goffset <- 0
}
else {
ginch <- max(strwidth(glabels, "inch"), na.rm = TRUE)
goffset <- 0.4
}
if (!(is.null(labels) && is.null(glabels))) {
nmai <- par("mai")
nmai[2L] <- nmai[4L] + max(linch + goffset, ginch) +
0.1
par(mai = nmai)
}
if (is.null(groups)) {
o <- 1L: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_len(color, length(groups))[o]
lcolor <- rep_len(lcolor, length(groups))[o]
offset <- cumsum(c(0, diff(as.numeric(groups)) != 0))
y <- 1L:n + 2 * offset
ylim <- range(0, y + 2)
}
plot.window(xlim = xlim, ylim = ylim, log = "")
lheight <- par("csi")
if (!is.null(labels)) {
linch <- max(strwidth(labels, "inch"), na.rm = TRUE)
loffset <- (linch + 0.1)/lheight
labs <- labels[o]
mtext(labs, side = 2, line = loffset, at = y, adj = 0,
col = color, las = 2, cex = cex, ...)
}
abline(h = y, lty = "dotted", col = lcolor)
points(x, y, pch = pch, col = color, bg = bg, cex = pt.cex/cex)
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
mtext(glabels, side = 2, line = goffset, at = gpos, 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,
cex = pt.cex/cex, ...)
}
}
# axis(1)
box()
title(main = main, xlab = xlab, ylab = ylab, ...)
invisible()
}
``````

Now we can use this function:

``````set.seed(1)
groups <- factor( rep(1:2, times = c(5, 15) ) )
mydotchart(rnorm(20), groups = groups)
``````

and the graph is:

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