I know you already got a good answer from Joshua Wiley.
Here is a function I find useful.
Anyone who wants to suggest improvements, please do so!
> my.ls
function(pos=1, sorted=FALSE, mode, class){
.result <- sapply(ls(pos=pos, all.names=TRUE),
function(..x)object.size(eval(as.symbol(..x))))
if (sorted){
.result <- rev(sort(.result))
}
.ls <- as.data.frame(rbind(as.matrix(.result),"**Total"=sum(.result)))
names(.ls) <- "Size"
.ls$Size <- formatC(.ls$Size, big.mark=',', digits=0, format='f')
.ls$Mode <- c(unlist(lapply(rownames(.ls)[-nrow(.ls)],
function(x)base::mode(eval(as.symbol(x))))), '-------')
if (!missing(mode)) {
.ls <- .ls[sapply(.ls$Mode, function(x) any(unlist(strsplit(x, ", "))
%in% mode)), , drop=FALSE]
}
.ls$Class <- c(sapply(rownames(.ls)[-nrow(.ls)],
function(x) paste(unlist(base::class(eval(as.symbol(x)))), collapse=",
")), '-------')
if (!missing(class)) {
.ls <- .ls[sapply(.ls$Class, function(x) any(unlist(strsplit(x, ", "))
%in% class)), , drop=FALSE]
}
.ls
}
So:
> my.ls(class='data.frame')
Size Mode Class
df 1,320 list data.frame
DF 648 list data.frame
DF2 712 list data.frame
geu1 72,864 list data.frame
result 1,384 list data.frame
t 896 list data.frame
HTH,
-- David L. Reiner
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Erin Hodgess
Sent: Saturday, October 01, 2011 10:38 PM
To: R help
Subject: [R] getting list of data.frame names
Dear R People:
This is probably a very simple question. I know that if I want to get a list
of the classes of the objects in the workspace, I can do this:
> sapply(ls(), function(x)class(get(x)))
a a1.df b d
"list" "data.frame" "integer" "numeric"
Now I want to get just the data frames.
> sapply(ls(), function(x)class(get(x))=="data.frame")
a a1.df b d
FALSE TRUE FALSE FALSE
However, I would like the names of the data frames, rather than the True/False
for the objects.
I've been trying all sorts of combinations/permutations with no success.
Any suggestions would be much appreciated.
Thanks,
Sincerely,
Erin
--
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences University of Houston -
Downtown
mailto: erinm.hodg...@gmail.com
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