plotting group means

Thanks for all the suggestions, but it seems, that all these functions need
a rearrangement of my data, since in my case, the dependent variables are in
different columns. The error.bars.by-function seems to be the only plotting
function, that does not need a rearrangement. Are there other functions,
which can do that or is there an easy way to rearrange the columns into one?

Thanks

Erich


-----Urspr?ngliche Nachricht-----
Von: hadley wickham [mailto:h.wickham at gmail.com] 
Gesendet: Dienstag, 9. September 2008 15:02
An: ONKELINX, Thierry
Cc: Erich Studerus; r-help at r-project.org
Betreff: Re: [R] plotting group means

On Tue, Sep 9, 2008 at 6:56 AM, ONKELINX, Thierry

Dear Erich,

Have a look at ggplot2

library(ggplot2)
dataset <- expand.grid(x = 1:20, y = factor(LETTERS[1:4]), value = 1:10)
dataset$value <- rnorm(nrow(dataset), sd = 0.5) + as.numeric(dataset$y)

Or with stat_summary:

qplot(x, value, data=dataset, colour=y, group = y) +
stat_summary(geom="line", fun="mean",size=2)

http://had.co.nz/