On Apr 24, 2009, at 11:56 AM, Jennifer Brea wrote:
I wanted to ask how I can make a for loop or a function return an R
object with a unique name based on either some XX of the for loop or
some input for the function.
For example
if I have a function:
fn<-function(data,year){
which does does some stuff
}
How do I return an object from the function called X.year, such that
if I run fn(data,1989), the output is an object called X.1989?
Read:
?assign
?paste
#and FAQ 7.21
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-variable_003f
In a separate but related process, I'm also trying to subset data by
year, where there are multiple observations by years, using the
subset() function. For example:
data.1946<-subset(data, year==1946)
data.1947<-subset(data, year==1947)
data.1948<-subset(data, year==1948)
data.1949<-subset(data, year==1949)
...
list.of.subsets <- sapply(1946:200, function(x) subset(data,
year==x) ) # with no example ... untested
Using data as a dataframe names is poor R programming practice, since
many functions use data a a parameter name and it is also a function
name.
How should I set this up? I was thinking of writing a for loop, but
I have never written a for loop that creates objects based on the
loop's index, for example a loop for(i in 1946:2000) that returns 55
objects with the object names based on the index.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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