You can edit the barplot function to do this:
mybarplot <-
function (height, width = 1, space = NULL, names.arg = NULL,
legend.text = NULL, beside = FALSE, horiz = FALSE, density = NULL,
angle = 45, col = NULL, border = par("fg"), main = NULL,
sub = NULL, xlab = NULL, ylab = NULL, xlim = NULL, ylim = NULL,
xpd = TRUE, log = "", axes = TRUE, axisnames = TRUE, cex.axis
par("cex.axis"),
cex.names = par("cex.axis"), inside = TRUE, plot = TRUE,
axis.lty = 0, offset = 0, add = FALSE, args.legend = NULL,
...)
{
if (!missing(inside))
.NotYetUsed("inside", error = FALSE)
if (is.null(space))
space <- if (is.matrix(height) && beside)
c(0, 1)
else 0.2
space <- space * mean(width)
if (plot && axisnames && is.null(names.arg))
names.arg <- if (is.matrix(height))
colnames(height)
else names(height)
if (is.vector(height) || (is.array(height) && (length(dim(height)) =
1))) {
height <- cbind(height)
beside <- TRUE
if (is.null(col))
col <- "grey"
}
else if (is.matrix(height)) {
if (is.null(col))
col <- grey.colors(nrow(height))
}
else stop("'height' must be a vector or a matrix")
if (is.logical(legend.text))
legend.text <- if (legend.text && is.matrix(height))
rownames(height)
stopifnot(is.character(log))
logx <- logy <- FALSE
if (log != "") {
logx <- length(grep("x", log)) > 0L
logy <- length(grep("y", log)) > 0L
}
if ((logx || logy) && !is.null(density))
stop("Cannot use shading lines in bars when log scale is
used")
NR <- nrow(height)
NC <- ncol(height)
if (beside) {
if (length(space) == 2)
space <- rep.int(c(space[2L], rep.int(space[1L],
NR - 1)), NC)
width <- rep(width, length.out = NR)
}
else {
width <- rep(width, length.out = NC)
}
offset <- rep(as.vector(offset), length.out = length(width))
delta <- width/2
w.r <- cumsum(space + width)
w.m <- w.r - delta
w.l <- w.m - delta
log.dat <- (logx && horiz) || (logy && !horiz)
if (log.dat) {
if (min(height + offset, na.rm = TRUE) <= 0)
stop("log scale error: at least one 'height + offset'
value <= 0")
if (logx && !is.null(xlim) && min(xlim) <= 0)
stop("log scale error: 'xlim' <= 0")
if (logy && !is.null(ylim) && min(ylim) <= 0)
stop("log scale error: 'ylim' <= 0")
rectbase <- if (logy && !horiz && !is.null(ylim))
ylim[1L]
else if (logx && horiz && !is.null(xlim))
xlim[1L]
else 0.9 * min(height, na.rm = TRUE)
}
else rectbase <- 0
if (!beside)
height <- rbind(rectbase, apply(height, 2L, cumsum))
rAdj <- offset + (if (log.dat)
0.9 * height
else -0.01 * height)
delta <- width/2
w.r <- cumsum(space + width)
w.m <- w.r - delta
w.l <- w.m - delta
if (horiz) {
if (is.null(xlim))
xlim <- range(rAdj, height + offset, na.rm = TRUE)
if (is.null(ylim))
ylim <- c(min(w.l), max(w.r))
}
else {
if (is.null(xlim))
xlim <- c(min(w.l), max(w.r))
if (is.null(ylim))
ylim <- range(rAdj, height + offset, na.rm = TRUE)
}
if (beside)
w.m <- matrix(w.m, ncol = NC)
if (plot) {
opar <- if (horiz)
par(xaxs = "i", xpd = xpd)
else par(yaxs = "i", xpd = xpd)
on.exit(par(opar))
if (!add) {
plot.new()
plot.window(xlim, ylim, log = log, ...)
}
xyrect <- function(x1, y1, x2, y2, horizontal = TRUE,
...) {
if (horizontal)
rect(x1, y1, x2, y2, ...)
else rect(y1, x1, y2, x2, ...)
}
if (beside)
xyrect(rectbase + offset, w.l, c(height) + offset,
w.r, horizontal = horiz, angle = angle, density = density,
col = col, border = border)
else {
for (i in 1L:NC) {
xyrect(height[1L:NR, i] + offset[i], w.l[i],
height[-1, i] + offset[i], w.r[i], horizontal = horiz,
angle = angle, density = density, col = col,
border = border[ifelse(i > length(border), 1, i)])
######## Line edited
}
}
if (axisnames && !is.null(names.arg)) {
at.l <- if (length(names.arg) != length(w.m)) {
if (length(names.arg) == NC)
colMeans(w.m)
else stop("incorrect number of names")
}
else w.m
axis(if (horiz)
2
else 1, at = at.l, labels = names.arg, lty = axis.lty,
cex.axis = cex.names, ...)
}
if (!is.null(legend.text)) {
legend.col <- rep(col, length.out = length(legend.text))
if ((horiz & beside) || (!horiz & !beside)) {
legend.text <- rev(legend.text)
legend.col <- rev(legend.col)
density <- rev(density)
angle <- rev(angle)
}
xy <- par("usr")
if (is.null(args.legend)) {
legend(xy[2L] - xinch(0.1), xy[4L] - yinch(0.1),
legend = legend.text, angle = angle, density = density,
fill = legend.col, xjust = 1, yjust = 1)
}
else {
args.legend1 <- list(x = xy[2L] - xinch(0.1),
y = xy[4L] - yinch(0.1), legend = legend.text,
angle = angle, density = density, fill = legend.col,
xjust = 1, yjust = 1)
args.legend1[names(args.legend)] <- args.legend
do.call("legend", args.legend1)
}
}
title(main = main, sub = sub, xlab = xlab, ylab = ylab,
...)
if (axes)
axis(if (horiz)
1
else 2, cex.axis = cex.axis, ...)
invisible(w.m)
}
else w.m
}
mybarplot(matrix(1:6, ncol=3), border = c(NA, "red", NA))
On Tue, Jan 12, 2010 at 3:06 PM, RINNER Heinrich
<HEINRICH.RINNER at tirol.gv.at> wrote:> Dear R-users,
>
> I am using R version 2.10.1 under windows.
>
> In a barplot, I want to mark one of the bars with a special border color.
> For example:
> barplot(c(3, 7, 11), border = c(NA, "red", NA))
>
> But how to do this when the bars are stacked?
> for example:
> barplot(matrix(1:6, ncol=3)) # border of second bar (i.e. the one with
total height = 7) should be red again, I try:
> barplot(matrix(1:6, ncol=3), border = c(NA, "red", NA))
>
> Obviously, this doesn't give me what I want.
> Your advice would be appreciated;
> kind regards
> Heinrich.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O