R help - Feb 2007 - list of data frame objects

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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try something like the following (untested):

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


I hope it helps.

Best,
Dimitris

----
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/
      http://www.student.kuleuven.be/~m0390867/dimitris.htm


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
>
>
> ---------------------------------
> Any questions?  Get answers on any topic at Yahoo! Answers. Try it now.
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>


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