[R] converting a list to a data.frame

[Dimitris Rizopoulos]

try something like this:

lis <- list(c(1,2,4), c(4,5,2,1), c(3,4,6,3), c(3,1,76,4,2))
##########
n.max <- max(sapply(lis, length))
val <- NA # what to fill in
fill <- function(x) c(x, rep(val, n.max - length(x)))
as.data.frame(do.call(rbind, lapply(lis, fill)))


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Biscarini, Filippo" <Filippo.Biscarini at wur.nl>
To: <r-help at stat.math.ethz.ch>
Sent: Tuesday, April 03, 2007 11:28 AM
Subject: [R] converting a list to a data.frame


> Hello,
>
> I have a list with n numerical components of different length (3, 4 
> or 5
> values in each component of the list); I need to export this as a 
> text
> file where each component of the list will be a row and where 
> missing
> values should fill in the blanks due to the different lengths of the
> components of the list.
> I think that as a first step I should convert my list to a data 
> frame,
> but this is not such a simple task to accomplish: I was thinking of 
> the
> following "for" loop:
>
> X<-data.frame(1,1,1,1,1);
>
> for (i in 1:length(list)) {
>
>    X[i,]<-unlist(list[[i]]);
>
> }
>
> Unfortunately, when the number of elements in the components of the 
> list
> are lower than 5 (maximum), I get errors or undesired results. I 
> also
> tried with rbind(), but again I couldn't manage to make it accept 
> rows
> of different length.
>
> Does anybody have any suggestions? Working with lists is very nice, 
> but
> I still have to learn how to transfer them to text files for 
> external
> use.
>
> Thnak you,
>
> Filippo Biscarini
> Wageningen University
>
> [[alternative HTML version deleted]]
>
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