[R] Error Bars

Anon. bob.ohara at helsinki.fi
Thu Nov 8 10:07:15 CET 2001

I'm trying to draw some error bars on a bar chart.  I'm using code like

thing <- c(3,3,3)
se <- c(1,1,1)
names(thing) <- c("A", "B", "C")
barplot(thing, ylim=c(0,4))
arrows(c(1:3), thing-se, c(1:3), thing+se, code=3, angle=90,length=0.1)

Using c(1:3) has 2 problems: 
1. Obviously it is untidy, but using names(thing) doesn't work, and I
can't find out what will work.
2. It draws the lines in the wrong place (i.e. not in the middle of the

I'm sure this problem has a well know and obvious solution, but it's not
so well known or obvious to me.

Thanks in advance.


Bob O'Hara
Metapopulation Research Group
Division of Population Biology
Department of Ecology and Systematics
PO Box 17 (Arkadiankatu 7)
FIN-00014 University of Helsinki

tel: +358 9 191 28779  fax: +358 9 191 28701
email: bob.ohara at helsinki.fi
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