Hi Josh,
Sorry, your examples have equal number of rows in both df and df2.
In my situation they haven't.
Strangely, your solution have worked only when I am copy post the code into the
command line.
If I use the code inside of a function I get an error at:
return(ds)
ERROR: arguments imply differing number of rows
Thanks,
Rui
> Date: Sat, 21 May 2011 11:46:05 -0700
> Subject: Re: [R] How to intantiate a list of data.frames?
> From: jwiley.ps...@gmail.com
> To: ruimax...@hotmail.com
> CC: r-help@r-project.org
>
> Hi Rui,
>
> Here is one option:
>
> ds <- vector("list", 6)
> for(i in 1:6) ds[[i]] <- list(df = mtcars[, c(i, i + 2)], df2 =
> mtcars[, c(i, i + 2)] + 10)
>
> another could be:
>
> altds <- lapply(1:6, function(x) {
> list(df = mtcars[, c(x, x + 2)], df2 = mtcars[, c(x, x + 2)] + 10)
> })
>
> all.equal(ds, altds)
>
> For some documentation, see
>
> ?vector
> ?lapply
>
> Cheers,
>
> Josh
>
> On Sat, May 21, 2011 at 10:47 AM, Rui Maximo <ruimax...@hotmail.com> wrote:
> >
> > Hello,
> >
> > I am newbie to R and I want to do this:
> >
> > for(i in 1:6)
> > {
> > ds[i] <- list(df=data.frame(oilDF[,1],oilDF[,i+2]),
> > df2=data.frame(oilDF2[,1],oilDF2[,i+2]))
> > }
> >
> > #oilDF and oilDF2 are 2 data frames with several columns. They have
> > different number of rows
> >
> > #I want to have for example ds[1]$df, ds[1]$df2 with the respective
> > data.frames.
> > #How can I instantiate a list of data.frames pairs with different number of
> > rows?
> >
> > Thank you,
> > Rui
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@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.
> >
>
>
>
> --
> Joshua Wiley
> Ph.D. Student, Health Psychology
> University of California, Los Angeles
> http://www.joshuawiley.com/
[[alternative HTML version deleted]]
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