Re: [R] converting a list to a data.frame

From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.be>
Date: Tue 03 Apr 2007 - 11:55:28 GMT

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


> 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]]
>
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Tue Apr 03 21:59:45 2007

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