Re: [R] Group a dinamic number of vectors in a data.frame

From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.be>
Date: Tue 21 Feb 2006 - 02:40:16 EST

one way is:

```N1 <- rnorm(4)
N2 <- rnorm(4)
N3 <- rnorm(4)
N4 <- rnorm(4)
X1 <- LETTERS[1:4]
###################
```

nams <- c(paste("N", 1:4, sep = ""), "X1") dat <- data.frame(lapply(nams, get))
names(dat) <- nams
dat

# check also
sapply(dat, data.class)

I hope it helps.

Best,
Dimitris

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

```Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://www.med.kuleuven.be/biostat/
http://www.student.kuleuven.be/~m0390867/dimitris.htm

```
• Original Message ----- From: "Daniele Medri" <dmedri@gmail.com> To: <r-help@stat.math.ethz.ch> Sent: Monday, February 20, 2006 4:26 PM Subject: [R] Group a dinamic number of vectors in a data.frame

> Hi all,
>
> I need to create a data.frame from a variable number of vectors.
> The number of these vectors could change so I need a dinamic way to
> group all in a data.frame. The number is length(abc).
>
> e.g. vectors in my workspace
>
> N1 <-c(1,2,3,4)
> N2 <-c(1,2,3,4)
> N3 <-c(1,2,3,4)
> abc <-c(1,2,3)
>
> the data.frame I want to create:
>
> tcm <-data.frame(OneVector, TwoVector, paste("N",1:length(abc)))
>
> Obviously :) if I am here this approach doesn't work, so any kind of
> tip
> is welcome.
>
> Cheers
> --
> Daniele Medri
>
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