On 24/04/15 10:41, Erin Hodgess wrote:
Hello!
I have a cbind type question, please: Suppose I have the following:
dog <- 1:3
cat <- 2:4
tree <- 5:7
and a character vector
big.char <- c("dog","cat","tree")
I want to end up with a matrix that is a "cbind" of dog, cat, and tree.
This is a toy example. There will be a bunch of variables.
I experimented with "do.call", but all I got was
1
2
3
I don't understand how you managed to get *that*. When I did the
"obvious" thing --- do.call(cbind,as.list(big.char)) --- I got
(as expected :-) )
[,1] [,2] [,3]
[1,] "dog" "cat" "tree"
Any suggestions would be much appreciated. I still think that do.call
might be the key, but I'm not sure.
R Version 3-1.3, Windows 7.
do.call(cbind,lapply(big.char,get,envir=.GlobalEnv))
Note: I had to throw in the specification of "envir" otherwise get()
got the cat() function from "base" rather than your vector "cat".
Probably not a problem for your real application; shouldn't hurt, but.
Another salutary example of why it's not a good idea to give data sets
names that are names of R built-ins.
cheers,
Rolf
--
Rolf Turner
Technical Editor ANZJS
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276
Home phone: +64-9-480-4619
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