On Mar 31, 2011, at 3:46 PM, Henrique Dallazuanna wrote:
Take a look in ?assign
On Thu, Mar 31, 2011 at 5:42 PM, Noah Silverman <n...@smartmediacorp.com
> wrote:
Hi,
I want to create variable names from within my code, but can't find
any documentation for this.
An example is probably the best way to illustrate. I am reading
data in from a file, doing a bunch of stuff, and want to generate
variables with my output. (I could make a "list of lists" and name
all the elements, but I really want separate variables.)
#################
#This is just a dummy example, please excuse any shortcuts...
data <- read.table("file", ....)
animals <- (data[,animal])
animals
"cat", "dog", "horse" # Not known what these are before I read
the data file
# do a bunch of stuff
mean_cat <- abc
var_cat <- dfd
mean_dog <- 123
var_dog <- 453
etc..
##############
This form can be worked into your loop:
> dat.a <- read.table(textConnection('cat dog horse\n1 2 3\n4 5 6\n7
8 9'), header=TRUE)
> animals <- names(dat.a)
> assign( paste("mean", animals[1], sep="_"),
mean(dat.a[[animals[1]]]) )
> mean_cat
[1] 4
Doesn't seem very R-ish, though.
I thought of trying to use the paste() function to create the
variable name, but that doesn't work:
for( animal in animals){
paste("mean", animal "_") <- 123
}
Any ideas???
--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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