On Nov 8, 2011, at 6:32 PM, Mary Kindall wrote:
I am downloading say 100 files from ucsc website and storing it into
dest
folder.
download.file function create a file in destination folder even if
the file
is not present which is something I dont want.
So I wrote if condition to remove the file if the download function
has non
zero value.
Now it exits when there is an error or file not present. How can I use
"try" and "if" condition together so that the program does not exit on
error and delete the created file in destination folder.
for (i in 1: 100)
{
fileUrl = ucscfilenames[i]
if (download.file(fileUrl, destFile, 'wget' , quiet = TRUE) != 0)
{
file.remove(destFile)
}
}
I do not see where destFile gets its values. I don't think you can
just give it a path. And why would you want to remove a file that was
never successfully created, anyway?
Wouldn't it be something like (pseudo-) :
<define a vector of destination file names>
if( try(download.file(fileUrl, destFile[i], 'wget' , quiet = TRUE) ) ) {
<write to error log> } else {
<write to success log> }
--
David Winsemius, MD
West Hartford, CT
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