[R] array vs matrix vs dataframe?

[Duncan Murdoch]

On 10/1/2006 7:02 PM, r user wrote:
> What is the difference among an array, a dataframe and
> a matrix?

Really, r, I think this is pretty well documented.  Could you let us 
know what you've read that left this ambiguous?

> 
> Why is the size of a dataframe so much larger? (see
> example below)

I suspect it's the row names.

Duncan Murdoch

> 
> a<-c(rep(1:1000000,1))
> b<-c(rep(1:1000000,1))
> c1<-cbind(a,b)
> cdf<-as.data.frame(cbind(a,b))
> cm<-as.matrix(cbind(a,b))
> 
> object.size(a)/1000000
> object.size(b)/1000000
> object.size(c1)/1000000
> object.size(cdf)/1000000
> object.size(cm)/1000000
> 
> ______________________________________________
> R-help at stat.math.ethz.ch 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.