errbar function

Scatter Plot with Error Bars

Draws a scatter plot, adding vertical error bars to all the points.

errbar(x, y, yplus, yminus, cap = 0.015,
       ylim = range(y,yplus,yminus),
       xlab= deparse(substitute(x)),
       ylab= deparse(substitute(y)), ...)

Arguments

• x: vector of x values.
• y: vector of y values.
• yplus: vector of y values: the tops of the error bars.
• yminus: vector of y values: the bottoms of the error bars.
• cap: the width of the little lines at the tops and bottoms of the error bars in units of the width of the plot. Default is 0.015.
• ylim: (numeric of length 2): the y-axis extents with a sensible default.
• xlab, ylab: axis labels for the plot, as in plot.default.
• ...: Graphical parameters (see par) may also be supplied as arguments to this function.

Author(s)

Originally Charles Geyer, U.Chicago, early 1991; then Martin Mächler.

See Also

errbar in package list("Hmisc") is similar.

Examples

y <- rnorm(10); d <- 1 + .1*rnorm(10)
errbar(1:10, y, y + d, y - d, main="Error Bars example")