[R] list of data frame objects

Dimitris Rizopoulos Dimitris.Rizopoulos at med.kuleuven.be
Sun Feb 18 10:36:20 CET 2007

try something like the following (untested):

objs <- ls()
sapply(objs, function(obj) inherits(get(obj), "data.frame"))

I hope it helps.


Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/

Quoting Tim McDonald <tim_b_mcdonald at yahoo.com>:

> Hi Folks,
> I need to extract the list of all my data frame objects. With     
> objects() I can list all objects and was hoping to use something   
> like the following:
> objects()[is.data.frame(objects())] to extracts all my objects that   
> are data frame...
> What am I doing wrong?
> Thanks - Tim
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