Ko-Kang Kevin Wang
2002-Sep-18 03:46 UTC
More on list to data frame (was: Re: [R] List to Data Frame
Hi,
Now suppose I have just one list called FOO, which has 25 objects, e.g.:
[[1]]
1 2 3 4 5
[[2]]
6 7 8 9 10
.
.
.
And I want to do something like:
FRED <- data.frame(cbind(unlist(FOO[[1]]),
unlist(FOO[[2]]),
# ... for all 25 subsets
))
Is it possible to do this, without doing unlist(FOO[[i]]) 25 times?
Cheers,
Kevin
On Fri, 23 Aug 2002, Patrick Connolly wrote:
> Date: Fri, 23 Aug 2002 17:02:37 +1200
> From: Patrick Connolly <p.connolly at hortresearch.co.nz>
> To: Ko-Kang Kevin Wang <kwan022 at stat.auckland.ac.nz>
> Subject: Re: [R] List to Data Frame
>
> On Fri, 23-Aug-2002 at 01:35PM +1200, Ko-Kang Kevin Wang wrote:
>
> |> Hi,
> |>
> |> Suppose I have two lists. The first list is called FOO while the
second
> |> is called FRED.
> |>
> |> Say FOO looks (I've simplifed it) like:
> |> [[1]]
> |> [,1]
> |> [1,] 1
> |> [2,] 2
> |>
> |> [[2]]
> |> [,1]
> |> [1,] 3
> |> [2,] 4
> |> while FRED looks like:
> |> [[1]]
> |> [,1]
> |> [1,] 5
> |> [2,] 6
> |>
> |> [[2]]
> |> [,1]
> |> [1,] 7
> |> [2,] 8
> |>
> |> Can I turn this list into a dataframe which looks like:
> |> FOO FRED
> |> theta1.1 1 5
> |> theta2.1 2 6
> |> theta1.2 3 7
> |> theta2.2 4 8
> |> or something close to this form?
>
> I think this would get you pretty close:
>
> data.frame(FOO = unlist(FOO), FRED = unlist(FRED))
>
>
> best
>
>
> --
> Patrick Connolly
> HortResearch
> Mt Albert
> Auckland
> New Zealand
> Ph: +64-9 815 4200 x 7188
> ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~
> I have the world`s largest collection of seashells. I keep it on all
> the beaches of the world ... Perhaps you`ve seen it. ---Steven Wright
> ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~
>
>
> ______________________________________________________
> 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.
> ______________________________________________________
>
Cheers,
Kevin
------------------------------------------------------------------------------
Ko-Kang Kevin Wang
Postgraduate PGDipSci Student
Department of Statistics
University of Auckland
New Zealand
Homepage: http://www.stat.auckland.ac.nz/~kwan022
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Ko-Kang Kevin Wang
2002-Sep-18 04:24 UTC
More on list to data frame (was: Re: [R] List to Data Frame
Hi,
I've solved the problem. I unlisted the list into a matrix first.
For those who are interested, this is what I did:
FOO.mm <- matrix(rep(NA, length(unlist(FOO))),
nrow = 25, ncol = 23)
for(i in 1 : n) {
FOO.mm[ ,i] <- unlist(FOO[[i]])
}
FRED <- as.data.frame(FOO.mm)
On Wed, 18 Sep 2002, Ko-Kang Kevin Wang wrote:
> Date: Wed, 18 Sep 2002 15:46:01 +1200 (NZST)
> From: Ko-Kang Kevin Wang <kwan022 at stat1.stat.auckland.ac.nz>
> To: R Help <r-help at stat.math.ethz.ch>
> Subject: More on list to data frame (was: Re: [R] List to Data Frame
>
> Hi,
>
> Now suppose I have just one list called FOO, which has 25 objects, e.g.:
> [[1]]
> 1 2 3 4 5
> [[2]]
> 6 7 8 9 10
> .
> .
> .
>
> And I want to do something like:
> FRED <- data.frame(cbind(unlist(FOO[[1]]),
> unlist(FOO[[2]]),
> # ... for all 25 subsets
> ))
>
> Is it possible to do this, without doing unlist(FOO[[i]]) 25 times?
>
> Cheers,
>
> Kevin
>
>
> On Fri, 23 Aug 2002, Patrick Connolly wrote:
>
> > Date: Fri, 23 Aug 2002 17:02:37 +1200
> > From: Patrick Connolly <p.connolly at hortresearch.co.nz>
> > To: Ko-Kang Kevin Wang <kwan022 at stat.auckland.ac.nz>
> > Subject: Re: [R] List to Data Frame
> >
> > On Fri, 23-Aug-2002 at 01:35PM +1200, Ko-Kang Kevin Wang wrote:
> >
> > |> Hi,
> > |>
> > |> Suppose I have two lists. The first list is called FOO while
the second
> > |> is called FRED.
> > |>
> > |> Say FOO looks (I've simplifed it) like:
> > |> [[1]]
> > |> [,1]
> > |> [1,] 1
> > |> [2,] 2
> > |>
> > |> [[2]]
> > |> [,1]
> > |> [1,] 3
> > |> [2,] 4
> > |> while FRED looks like:
> > |> [[1]]
> > |> [,1]
> > |> [1,] 5
> > |> [2,] 6
> > |>
> > |> [[2]]
> > |> [,1]
> > |> [1,] 7
> > |> [2,] 8
> > |>
> > |> Can I turn this list into a dataframe which looks like:
> > |> FOO FRED
> > |> theta1.1 1 5
> > |> theta2.1 2 6
> > |> theta1.2 3 7
> > |> theta2.2 4 8
> > |> or something close to this form?
> >
> > I think this would get you pretty close:
> >
> > data.frame(FOO = unlist(FOO), FRED = unlist(FRED))
> >
> >
> > best
> >
> >
> > --
> > Patrick Connolly
> > HortResearch
> > Mt Albert
> > Auckland
> > New Zealand
> > Ph: +64-9 815 4200 x 7188
> >
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~
> > I have the world`s largest collection of seashells. I keep it on all
> > the beaches of the world ... Perhaps you`ve seen it. ---Steven Wright
> >
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~
> >
> >
> > ______________________________________________________
> > 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.
> > ______________________________________________________
> >
>
> Cheers,
>
> Kevin
>
>
------------------------------------------------------------------------------
> Ko-Kang Kevin Wang
> Postgraduate PGDipSci Student
> Department of Statistics
> University of Auckland
> New Zealand
> Homepage: http://www.stat.auckland.ac.nz/~kwan022
>
>
>
Cheers,
Kevin
------------------------------------------------------------------------------
Ko-Kang Kevin Wang
Postgraduate PGDipSci Student
Department of Statistics
University of Auckland
New Zealand
Homepage: http://www.stat.auckland.ac.nz/~kwan022
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at
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Uwe Ligges
2002-Sep-18 06:17 UTC
More on list to data frame (was: Re: [R] List to Data Frame
Ko-Kang Kevin Wang wrote:> > Hi, > > Now suppose I have just one list called FOO, which has 25 objects, e.g.: > [[1]] > 1 2 3 4 5 > [[2]] > 6 7 8 9 10 > . > . > . > > And I want to do something like: > FRED <- data.frame(cbind(unlist(FOO[[1]]), > unlist(FOO[[2]]), > # ... for all 25 subsets > )) > > Is it possible to do this, without doing unlist(FOO[[i]]) 25 times?If want to coerce a list with appropriate elements to a data.frame, as in your example, just use as.data.frame(FOO). Uwe Ligges -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._