[R] List of lists???

[Stephane CRUVEILLER]

Thx for the hint...
the div <- factor(c(1,1,1,2,2)) did exactly what I was expecting...

Stéphane.

Le Mardi 31 Janvier 2006 15:50, Gabor Grothendieck a écrit :
> 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
> >
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-- 
==========================================================
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