Hi,
I would like to perform computations on some variables belonging to the same
dataframe. For instance my data frame has the following shape:
????????????????toto1??????toto2??????toto3??????toto4??????toto5
1 ????????????1??????????????2??????????????3??????????????4??????????????5
2??????????????6??????????????7??????????????8??????????????9??????????????10
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 a 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
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 > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html >
Thx for the hint... the div <- factor(c(1,1,1,2,2)) did exactly what I was expecting... St??phane. Le Mardi 31 Janvier 2006 15:50, Gabor Grothendieck a ??crit :> 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 > > > > ______________________________________________ > > R-help at stat.math.ethz.ch mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide! > > http://www.R-project.org/posting-guide.html-- =========================================================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