On Feb 6, 2012, at 8:05 PM, frauke wrote:
Hey everybody,
it would be really appreciate if you knew the solution to the
following
problem.
I am trying to load data from the internet into R without having to
save
them. However, I need to acess a different website for each dataset.
So I
want to alternate an element in the URL. Eventually, I want to fill
a 3
dimensional matrix/array where each slice is a two-dimensional
matrix from
the corresponding website. For example:
###############################################################################
ID=c(1,5,6,8,10) #ID of dataset/website, each
dataset
contains a matrix [4x6]
data=array(numeric(0),length(ID) ,4,6) #empty array [5x4x6]
?array ## with attention to the dim argument
for (kk in 1:length(ID)) {
url <-cat("http://ministry.gov/case",ID[kk],"_agencyk";) #should
return
"http://ministry.gov/case1_agencyk"; for kk=1, etc.
import.data <- as.matrix( read.table(url) )
for (tt in 1:4) {
for (mm in 1:6) {
data[kk,tt,mm] <- import.data[tt,mm]
}}}
################################################################################
I got all to work, but the problem is assembling the URL. In the
code above
url just returns NULL.
Right. `cat` always returns NULL. If you want to paste things
together, then ... use `paste`
Once that is solved I have trouble because
read.table needs the URL to be in "". If I put read.table("url") R
wont
recognize it as the url I defined earlier.
You do not want quotes around url. And its a bad idea to give it the
name of a function as well. Can't really offer tested code because http://ministry.gov/case1_agencyk
doesn't exist.
--
David.
But I also do not know how to use
cat() to get " at beginning and end.
If I am approaching this in a totally dorky way (likely...), please
let me
know, too.
Thank you!! Frauke
Frauke Hoss
PhD student Carnegie Mellon
--
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David Winsemius, MD
West Hartford, CT
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