Your post seems to be messed up but I will assume you have a
5 column data frame and the questino is how to run f on the first
three columns and separately on the last two. I think the
easiest is just the following where I have used the builtin iris
data set where I have assumed that the operation you want
to perform is summary for purposes of example:
summary(iris[,1:3])
summary(iris[,4:5])
If this is not your real problem and the real problem has many more
divisions then try this where div is a factor that defines the division
of columns into sets:
div <- factor(c(1,1,1,2,2))
lapply(split(names(iris), div), function(n) summary(iris[n]))
On 1/31/06, Stephane CRUVEILLER <scruveil at genoscope.cns.fr> wrote:
Hi,
I would like to perform computations on some variables belonging to the
same dataframe. For instance my data frame has the following shape:
toto1toto2toto3toto4toto5
1 12345
2678910
I would like to perform the calculation on c("toto1","toto2","toto3") and
then the same calculation on c("toto4","toto5"). Is there a way to tell R
to do it using 3 loop (a list of lists)??
Stephane.
--
==========================================================
Stephane CRUVEILLER Ph. D.
Genoscope - Centre National de Sequencage
Atelier de Genomique Comparative
2, Rue Gaston Cremieux CP 5706
91057 Evry Cedex - France
Phone: +33 (0)1 60 87 84 58
Fax: +33 (0)1 60 87 25 14
EMails: scruveil at genoscope.cns.fr ,scruvell at infobiogen.fr