plotSticks {oce} | R Documentation |
The arrows are drawn with directions on the graph that match the directions
indicated by the u
and v
components. The arrow size is set
relative to the units of the y
axis, according to the value of
yscale
, which has the unit of v
divided by the unit of
y
.
The interpretation of diagrams produced by plotSticks
can be
difficult, owing to overlap in the arrows. For this reason, it is often
a good idea to smooth u
and v
before using this function.
plotSticks(x, y, u, v, yscale = 1, add = FALSE, length = 1/20, mgp = getOption("oceMgp"), mar = c(mgp[1] + 1, mgp[1] + 1, 1, 1 + par("cex")), xlab = "", ylab = "", ...)
x |
x coordinates of stick origins. |
y |
y coordinates of stick origins. If not supplied, 0 will be used; if length is less than that of x, the first number is repeated and the rest are ignored. |
u |
x component of stick length. |
v |
y component of stick length. |
yscale |
scale from u and v to y (see “Description”). |
add |
boolean, set |
length |
value to be provided to |
mgp |
3-element numerical vector to use for |
mar |
value to be used with |
xlab, ylab |
labels for the plot axes. The default is not to label them. |
... |
graphical parameters passed down to |
Dan Kelley
library(oce) # Flow from a point source n <- 16 x <- rep(0, n) y <- rep(0, n) theta <- seq(0, 2*pi, length.out=n) u <- sin(theta) v <- cos(theta) plotSticks(x, y, u, v, xlim=c(-2, 2), ylim=c(-2, 2)) rm(n, x, y, theta, u, v) # Oceanographic example data(met) t <- met[["time"]] u <- met[["u"]] v <- met[["v"]] p <- met[["pressure"]] oce.plot.ts(t, p) plotSticks(t, 99, u, v, yscale=25, add=TRUE)