Draw Error Bars on an Existing xy Diagram

Usage

errorbars(x, y, xe, ye, percent = FALSE, style = 0, length = 0.025, ...)

x, y: coordinates of points on the existing plot.
xe, ye: errors on x and y coordinates of points on the existing plot, each either a single number or a vector of length identical to that of the corresponding coordinate.
percent: boolean flag indicating whether xe and ye are in terms of percent of the corresponding x and y values.
style: indication of the style of error bar. Using style=0 yields simple line segments (drawn with segments()) and style=1 yields line segments with short perpendicular endcaps.
length: length of endcaps, for style=1 only; it is passed to arrows(), which is used to draw that style of error bars.
...: graphical parameters passed to the code that produces the error bars, e.g. to segments() for style=0.

Dan Kelley

library(oce)
data(ctd)
S <- ctd[["salinity"]]
T <- ctd[["temperature"]]
plot(S, T)
errorbars(S, T, 0.05, 0.5)