Re: [R] Creating a data.frame

From: Andrew Robinson <A.Robinson_at_ms.unimelb.edu.au>
Date: Thu, 14 Feb 2008 10:13:37 +1100

Hi Joe,

cbind coerces the data to be the same type. Much nicer is:

d <- data.frame(x=x, y=y, z=z)

Cheers

Andrew

On Wed, Feb 13, 2008 at 05:17:32PM -0500, Joe Trubisz wrote:
> OK...newbie question here.
> Either I'm reading the docs wrong, or I'm totally confused.
>
> Given the following:
>
> x<-c("aaa","bbb","ccc")
> y<-rep(0,3)
> z<-rep(0,3)
>
> is.character(x)
> [1] TRUE
>
> is.numeric(y)
> [1] TRUE
>
> Now...I want to create a data frame, but keep the data types.
> In reading the docs, I assume you do it this way:
>
> d<-data.frame(cbind(x=I(x),y=y,z=z)
>
> But, when I do str(d), I get the following:
>
> 'data.frame': 3 obs. of 3 variables:
> $ x: Factor w/ 3 levels "aaa","bbb","ccc": 1 2 3
> $ y: Factor w/ 1 level "0": 1 1 1
> $ z: Factor w/ 1 level "0": 1 1 1
>
> I thought the I() prevents character from becoming factors, right?
> Secondly, how do I force y and z in the data frame to become numeric?
>
> Thanks in advance
> Joe
>
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-- 
Andrew Robinson  
Department of Mathematics and Statistics            Tel: +61-3-8344-6410
University of Melbourne, VIC 3010 Australia         Fax: +61-3-8344-4599
http://www.ms.unimelb.edu.au/~andrewpr
http://blogs.mbs.edu/fishing-in-the-bay/

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Received on Wed 13 Feb 2008 - 23:29:49 GMT

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