[R] plotting simple plot with error bars

[Uwe Ligges]

Timur Elzhov wrote:
> 
> Hello!
> 
> I'm novice in R, so excuse me if my question will be quite trivial.
> I look through all the demos and examples, but could not find how could I
> plot 'classical' simple graph with error bars.  That is, I have dataframe
> with 3 columns: "x", "y" and "dy" -- how can I get points (x, y) with,
> for example, short lines of length "dy" up and down from "y"?

Use segments(). Example:

 mydat <- data.frame(x=1:10, y=1:10, dy=rnorm(10))
 attach(mydat)
 plot(x, y, ylim = range(y, y + dy))
 segments(x, y, x, y + dy)

Uwe Ligges
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