Re: [R] ls() and classes

From: Henrik Bengtsson <hb_at_stat.berkeley.edu>
Date: Wed, 19 Mar 2008 12:35:14 -0700

> library(R.oo)
> example(data.frame)
> example(matrix)
> example(iris)
> ll()

   member data.class dimension objectSize

1  author  character         1        120
2       d data.frame   c(10,3)       1136
3     d.0 data.frame    c(0,3)        824
4      d0 data.frame   c(10,0)        320
5     d00 data.frame    c(0,0)        312
6      dd data.frame   c(10,4)       1680
7    dni3       list         3        392
8      ii data.frame  c(150,5)       6424
9      L3  character         3        136
10   mdat     matrix    c(2,3)        480

> subset(ll(), data.class == "data.frame")

  member data.class dimension objectSize
2      d data.frame   c(10,3)       1136
3    d.0 data.frame    c(0,3)        824
4     d0 data.frame   c(10,0)        320
5    d00 data.frame    c(0,0)        312
6     dd data.frame   c(10,4)       1680
8     ii data.frame  c(150,5)       6424

> subset(ll(), data.class %in% c("character", "matrix") & objectSize > 125)

   member data.class dimension objectSize

9      L3  character         3        136
10   mdat     matrix    c(2,3)        480

You can also add your own column annotations given some rules of yours by passing special functions. See help(ll) for more details.

/Henrik

On Wed, Mar 19, 2008 at 7:50 AM, David Winsemius <dwinsemius_at_comcast.net> wrote:
> Rolf Turner <r.turner@auckland.ac.nz> wrote in
> news:72856D72-D960-48ED-AA77-ABD353548C08_at_auckland.ac.nz:
>
>
> >
> > On 19/03/2008, at 4:39 PM, Erin Hodgess wrote:
> >
> >> Dear R People:
> >>
> >> I want to get the class of all of the objects in my directory.
> >>
>
> >
>
> > Too easy!!!
> >
> > sapply(ls(),function(x){class(get(x))})
> >
>
>
> Thank you, Rolf. That supplied the needed index to the question I
> struggled with yesterday: How to get a list of only my dataframes:
>
> ls()[sapply(ls(),function(x){class(get(x))}) == "data.frame"]
>
> --
> David Winsemius
>
>
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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>



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. Received on Wed 19 Mar 2008 - 19:39:55 GMT

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