[R] how to use do.call("rbind", get(list(mlist)))

[McGehee, Robert]

get() doesn't take a list. You need to wrap it in an lapply so that it
grabs the dataframes individually and then wraps it into a list for
do.call().

The easy way, however, that doesn't involve do.call or get is to simply
construct the proper text rbind query and then run it with eval.

eval(parse(text = paste("rbind(", paste("m", 302:500, sep = "", collapse
= ", "), ")")))

To use the do.call() / get() construct, I think this is what you were
thinking of:

mlist <- paste("m",302:500,sep="")
do.call("rbind", lapply(mlist, get))

Best,
Robert

-----Original Message-----
From: roger bos [mailto:roger.bos at gmail.com] 
Sent: Friday, January 21, 2005 12:07 PM
To: r-help at stat.math.ethz.ch
Subject: [R] how to use do.call("rbind", get(list(mlist)))


I have around 200 data frames I want to rbind in a vectorized way. 
The object names are:

m302
m303
...
m500

So I tried:

mlist <- paste("m",302:500,sep="")
dat <- do.call("rbind", get(list(mlist)))

and I get "Error in get(x, envir, mode, inherits) : invalid first
argument"

I know "rbind" is valid because 

dat <- rbind(m302, m303, m304, m305)

works, I am just too lazy to type it out to m500.

I also tried it without the get() portion, but then dat ends up being
a column with just the names of the objects, not the objects
themselves.

Thanks in advance for showing me the errors in my attempts.

Roger

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