Within a function I'm assigning dynamic variable names and values to them
using the "assign" function. I want to pass back the results but am
uncertain how to do this.
Basically, my function reads a number of data files and uses the filename of
each file as the variable name for a list-to-become-dataframe. I want then
to pass all these lists back, but again, the names of the lists to pass back
have been "assign-ed" to the filename. See code snippet below, especially
the "*** WHAT DO I PUT HERE ***" part!
Thanks in advance for any help!!!
-Scott
CODE SNIPPET BELOW:
loadFiles <- function()
{
fullFileNames <- choose.files(filters = c("Fluor file (*.data,*.Dat)",
"*.dat;*.Dat"))
numFiles <- length(fullFileNames)
fileNames <- basename(fullFileNames) # removes the all the paths from the
full filenames
splitNames <- strsplit(fileNames,"_") # create a "list" of strings
separated by the "_" character
dfNames <- sapply(splitNames,"[",1)
# or I could use "sapply(splitNames, function (x) x[1])" OR EVEN
"unlist(lapply(splitNames, function(x)x[1]))" -- [Thanks to Andy Liaw,
Simon Blomberg, Gabor Grothendieck,
#James Holtman and Robert Keefe for their helpful responses on this
question - See posting on returning the first elements of a list of vectors]
#
for (i in 1:numFiles)
{
assign(dfNames[[i]],ReadFileCreateDF(fullFileNames[[i]]))
# we use "assign" since we want the quoted string in dfNames to be assigned
the value of the function call
# the ReadFileCreateList is a function that reads an
individual file and sends back a number of parameters in a list
}
return(list( *** WHAT DO I PUT HERE***))
}
Scott Norton, Ph.D.
Engineering Manager
Nanoplex Technologies, Inc.
2375 Garcia Ave.
Mountain View, CA 94043
www.nanoplextech.com
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