I typically do something like this:
nm <- 'TEF'
## split into multiple lines only to make it easier to read
dpath <- paste('http:// ichart.yahoo.com/table.csv?s=',
nm,
'.MC&a=00&b=1&c=2003&d=05&e=23&f=2009&g=d&ignore=.csv', sep='')
download.file( dpath, 'c:\\projects\\stock data\\data\\test.csv',quiet=TRUE)
Then just change the value of nm to different letters.
I have also used the sub() or gsub() approach like Thomas, and the
"wrap it in a function" approach like David, though I would use
paste() inside the function, not the substitute() that he uses.
So you see, R tends to have multiple ways to do things.
-Don
At 7:40 PM +0200 6/23/09, 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?
Thanks in advance for any assistance.
--
Best regards,
David Young
Marketing and Statistical Consultant
Madrid, Spain
+34 913 540 381
http:// www. linkedin.com/in/europedavidyoung
mailto:dyo...@telefonica.net
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PLEASE do read the posting guide http:// www. R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
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and provide commented, minimal, self-contained, reproducible code.
