Hi,
Try:
dir.create("final")
lst1 <- 
split(list.files(pattern=".csv"),gsub("\\_.*","",list.files(pattern=".csv"))) 
lst2 <-  lapply(lst1,function(x1) lapply(x1, function(x2) {lines1 <- 
readLines(x2); header1 <- lines1[1:2]; dat1 <- 
read.table(text=lines1,header=FALSE,sep=",",stringsAsFactors=FALSE, skip=2); 
colnames(dat1) <- Reduce(paste,strsplit(header1,","));dat1}))

lstYear <- lapply(lst2,function(x) lapply(x, function(y) 
y[,1,drop=FALSE])[[1]]) 


lapply(seq_along(lst2),function(i) {lstN <-lapply(lst2[[i]],function(x) 
x[,-1]); arr1 <- 
array(unlist(lstN),dim=c(dim(lstN[[1]]),length(lstN)),dimnames=list(NULL,lapply(lstN,names)[[1]]));res
 <- cbind(lstYear[[i]],rowMeans(arr1,dims=2,na.rm=TRUE)); names(res) <- 
gsub("\\_$","",gsub(" ", "_",names(res))); res[,1] <- gsub(" <", "",res[,1]); 
write.csv(res,paste0(paste(getwd(),"final",names(lst1)[[i]],sep="/"),".csv"),row.names=FALSE,quote=FALSE)
   }) 


A.K.

On Thursday, April 10, 2014 11:55 PM, Zilefac Elvis <zilefacel...@yahoo.com> 
wrote:

HI AK,
I have finished calculating my statistics and would like to merge the files 
into 1 files resulting from 100 simulations.

In the attached .zip file, I have 4 files for site G100_ and 4 for site G101_ 
identified by site code. I have 12000 (120 sites * 100 sims) such files to deal 
with but I have provided a sample only.

1) Replace any empty spaces (no values) with NA
2) Take the mean of values in each cell

Create a folder called "final" and store the results in it. For this sample, 
the folder "final" will have two files (G100 and G101). The contents of each 
file being the mean from 4 files. The headers, rows and columns of files in 
"final" are exactly the same as those of any file in sample.zip. Headers, rows 
and columns are the same for all files in sample.zip.

Thanks AK. Please do it at your convenience.
Regards,
Atem.

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