I often use the paste() and assign() approach that David suggested.
Another approach is to read into R a vector of file names and then
loop over that vector.
Along the lines of:
infiles <- list.files(pattern='data*.dat')
dlist <- list()
length(dlist) <- length(infiles)
names(dist) <- infiles
for (inf in infiles) {
tmpd <- read.table(inf, *other args*)
## if you need to keep copies within R of all 500 sets of data
dlist[[inf]] <- tmpd
## data analasyis using tmpd or dlist[[inf]]
}
-Don
At 10:22 AM -0500 11/12/09, David Winsemius wrote:
On Nov 12, 2009, at 8:42 AM, Jeff Harring wrote:
I have a question regarding automatizing simulation runs in R...
I have 500 external data sets for a simulation study that I would
like to bring into R to analyze. They have the names data1.dat,
data2.dat, ..., dataN.dat
Is there a way to automatize the bringing in of these data sets in
R using the read.table function within a looping cycle?
For example...
for (j in 1:N){
data_"j" = read.table("data"j".dat, header=F)
Perhaps something like this:
for (j in 1:N){
assign(paste("data", j, sep="_") , read.table(
paste("data",j,".dat", sep=""), header=F) }
Or even better might be to assign to a list which would augmentalize
your future automatizabilationabilty:
flist <- list()
for (j in 1:N){
flist[[j]] <- read.table( paste("data",j,".dat", sep=""), header=F) }
--
David
executable code
.
.
.
}
bring in the next data set.
SAS uses a ampersand "&" to automatize the process.
Example code:
data _NULL_;
set final;
filename out "C:\data&k..dat";
file out;
put variables;
run;
I would welcome any insight into how to address this issue.
Thank you.
Jeff Harring
--
**********************************************************
Jeffrey R. Harring, Assistant Professor
Department of Measurement, Statistics & Evaluation (EDMS)
1230 Benjamin Building
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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--
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
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and provide commented, minimal, self-contained, reproducible code.
