On Tue, 23 Jun 2009, David Young wrote:
Hi I'm new to R and would like to implement a SAS-like macro variable
in R.
What I'd like to do is take the simple R code below and change the
"=TEF" to different letters to refer to different companies' data for
download.
# DOWNLOADS FILES FROM YAHOO INTERNET
download.file('http://ichart.yahoo.com/table.csv?s=TEF.MC&a=00&b=1&c=2003&d=05&e=23&f=2009&g=d&ignore=.csv',
'c:\\projects\\stock data\\data\\test.csv',quiet=TRUE)
As you can see the text I want to change is within the quoted Internet
address. Is this possible in R?
I do this sort of thing with sub() or gsub()
download.file(sub('TEF','http://ichart.yahoo.com/table.csv?s=TEF.MC&a=00&b=1&c=2003&d=05&e=23&f=2009&g=d&ignore=.csv',thing_to_sub_for_TEF),
'c:\\projects\\stock data\\data\\test.csv',quiet=TRUE)
I would also use forward slashes / rather than double backslashes \\, but
that's just a matter of taste.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
tlum...@u.washington.edu University of Washington, Seattle
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