points(x, ...) points.default(x, y=NULL, type="p", pch=1, col="black", bg=NA, cex=1, ...)
x, y
| coordinate vectors of points to plot. |
type
|
character indicating the type of plotting; actually any of
the type s as in plot(..) .
|
pch
|
plotting `character', i.e. symbol to use. pch can
either be a character or an integer code for a set of
graphics symbols. The full set of S symbols is available with
pch=0:18 .
In addition, there is a special set of R plotting symbols which
can be obtained with
|
col
|
color code or name, see colors ,
palette .
|
bg
| background (``fill'') color for open plot symbols |
cex
| character expansion |
...
|
Further graphical parameters (see plot.xy
and par ) may also be supplied as arguments.
|
points
is a generic function to draw a sequence of points at
the specified coordinates. The specified character(s) are plotted,
centered at the coordinates.
Graphical parameters are permitted as arguments to this function.
plot
, lines
, and the underlying
``primitive'' plot.xy
.plot(-4:4, -4:4, type = "n")# setting up coord. system points(rnorm(200), rnorm(200), col = "red") points(rnorm(100)/2, rnorm(100)/2, col = "blue", cex = 1.5) ##-------- Showing all the extra & some char graphics symbols ------------ Pex <- if(.Device=="postscript") 5 else 20 ipch <- 1:(np <- 25+11); k <- floor(sqrt(np)); dd <- c(-1,1)/2 rx <- dd + range(ix <- (ipch-1) %/% k) ry <- dd + range(iy <- 3 + (k-1)-(ipch-1) %% k) pch <- as.list(ipch) pch[25+ 1:11] <- as.list(c("*",".", "o","O","0","+","-",":","|","%","#")) plot(rx, ry, type="n", axes = F, xlab = "", ylab = "", main = "plot symbols : points (.. pch = * )") abline(v = ix, h = iy, col = "lightgray", lty = "dotted") for(i in 1:np) { pc <- pch[[i]] points(ix[i], iy[i], pch = pc, col = "red", bg = "yellow", cex = Pex) ## red symbols with a yellow interior (where available) text(ix[i] - .3, iy[i], pc, col = "brown", cex = 1.5) }