Re: [R] Construct a data.frame in a FOR-loop

From: Kristel Joossens <>
Date: Mon 05 Dec 2005 - 03:10:30 EST

Serguei Kaniovski wrote:
> Say I have a FOR-loop for computing powers (just a trivial example)
> for(i in 1:5)
> {
> x<-i^2
> y<-i^3
> }
> How can I create a data.frame and a 3D plot of (i,x(i),y(i)), i.e. for
> each iteration

First of all you can easily avoid for-loops in such examples. You can better work with matrices, so just do

R> i <- 1:5
R> x <- i^2
R> y <- i^3

Second, maybe very interesting, if you want to look somethimg up and do not know the R-command. You can always try with RSiteSearch("...").

I'm not sure what you mean with ``construct a data.frame in a for loop''. As far as I know you can better first do the loop and construct at the end the data.frame. Anyway, to create a data.frame, you can e.g. do R> resdf <-,x,y))

To create 3D-plot there are seeral possibilities. Try ?persp (for surfaces)
or you can download the scatterplot3d package available on CRAN (for points and lines).

Hopefully this helps,
Good luck,

Disclaimer: mailing list PLEASE do read the posting guide! Received on Mon Dec 05 04:23:37 2005

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