Question

Possible Duplicate:
Read multiple CSV files into separate data frames

How can I fill part of URL with a for loop, I tried one URL it worked, eg:

data <- read.table("http://somelink.php?station=2&start=2012-01-01&etc", header=T,sep="|")

But when I changed the code into a loop, it failed:

station <- c(1:10)
Year <- format(Sys.time(), "%Y")

for (i in station){
data <- read.table("http://somelink.php?station=i&start=Year-01-01&etc", header=T,sep="|")
}

Answer 1

The problem is that your iterator i is inside the quotation marks and hence not being evaluated as intended. use paste0(.)

---

Also, you may want your variable data to be list-like. And perhaps not called data.

myData <- list(length = length(station))
for (i in station){
  urli <- paste0("http://somelink.php?station=", i, "&start=Year-01-01&etc")
  myData[[i]] <- read.table(urli, header=T,sep="|")
}

---

Edit (mnel)

or more idiomatically

urls <-paste0("http://somelink.php?station=",station, "&start=", Year, "01-01&etc")
myData <- lapply(urls, read.table, header = TRUE, sep = '|')