[R] Error Bars
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")
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.
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