On Wed, 7 Apr 2010, Ivan Calandra wrote:
Hi,
I'm not sure what your goal is, but why don't you use a list?
You can store each new dataframe name in a new element of the list.
At the end, if each element has the same length, you can use as.data.frame()
or something similar.
Using a list would be my first choice.
You can also use an environment, which gives you access to list like
idioms, or which you can attach() to access the objects from the search
list:
my.dfs <- new.env()
dfname <- 'a.df'
assign(dfname, as.data.frame(diag(2)),env=my.dfs)
dfname <- 'b.df'
assign(dfname, as.data.frame(diag(3)),env=my.dfs)
ls(my.dfs)
[1] "a.df" "b.df"
sapply(my.dfs,function(x) coef(lm(V1~.,x)))
$b.df
(Intercept) V2 V3
1 -1 -1
$a.df
(Intercept) V2
1 -1
HTH,
Chuck
Since you didn't provide any sample data, I'm not sure if that's really what
you're looking for, but what I said might get you started.
I'm no expert, but I might be able to help you a bit further if you provide
the necessary information (which you can find in the posting guide)
Ivan
Le 4/7/2010 18:13, Kavitha Venkatesan a écrit :
Hi,
I'd greatly appreciate any insight into the problem in my previous
message below: Please note that I would like to loop through the
following steps for a list of data frames whose names are dynamically
assigned at run time, so I have a character string variable, called
"variable.df", which stores the name of the data frame at any given
point ...and I need to be able to manipulate the contents of the data
frame somehow using this character string :
> colnames(variable.df) = colnames(some.other.df)
> variable.df = rbind(variable.df, some.other.df)
> write.table(variable.df, file=some.file)
>
Thanks!
Kavitha
On Sat, Mar 20, 2010 at 5:07 PM, Kavitha Venkatesan
<kavitha.venkate...@gmail.com> wrote:
> Hi,
>
> I would like to do the following operations:
>
> variable.df is a character string that contains the name of the data
> frame that I want to do the following operations on:
>
> variable.df<- data.frame();
> # I can do the above command using
> assign( variable.df, data.frame() )
>
> How can I perform the assignment statements below ?
>
> colnames(variable.df) = colnames(some.other.df)
> variable.df = rbind(variable.df, some.other.df)
> write.table(variable.df, file=some.file)
>
> Doing
> eval( substitute( colnames(var), list(var=as.name(variable.df) ) ) )
> didn't get me all the way there.
>
> Thanks!
> Kavitha
>
>
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--
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. Säugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calan...@uni-hamburg.de
**********
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http: //webapp5.rrz.uni-hamburg.de/mammals/eng/mitarbeiter.php
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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.
Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:cbe...@tajo.ucsd.edu UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
______________________________________________
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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.
