[R] Creating a data.frame

[Peter Alspach]

Joe

d <- data.frame(x=x, y=y, z=z)
sapply(d, class)
        x         y         z 
 "factor" "numeric" "numeric" 

d <- data.frame(x=x, y=y, z=z, stringsAsFactors=F)
sapply(d, class)
          x           y           z 
"character"   "numeric"   "numeric" 

HTH ....

Peter Alspach
 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Joe Trubisz
> Sent: Thursday, 14 February 2008 11:18 a.m.
> To: r-help at r-project.org
> Subject: [R] Creating a data.frame
> 
> 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
> 
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
> 

The contents of this e-mail are privileged and/or confidential to the named
 recipient and are not to be used by any other person and/or organisation.
 If you have received this e-mail in error, please notify the sender and delete
 all material pertaining to this e-mail.