One reason to duplicate is adjustments --
the adjusted close changes over time for
the same day.
Pat
On 26/04/2012 23:46, Gordon Erlebacher wrote:
Hi Brian,
I have huge amounts of disk. The issue is time efficiency. Why download 150
days of 7000 stocks each day, when I need only download 1 day of each
stock. Of course, I can write my own caching system, but why duplicate what
somebody may have done already. I am relatively new to R, but I have done
similar things in other computer languages (not in Finance though).
On an aside, using attachSymbols, I can load on demand. I would like to
cycle through the list of 7000 stocks. I can get the list, but given "AAPL"
for example, I need to execute AAPL. I do not know how to do this yet.
Thanks for the input!
Gordon
On Thu, Apr 26, 2012 at 6:39 PM, Brian G. Peterson<br...@braverock.com>wrote:
On Thu, 2012-04-26 at 18:22 -0400, Gordon Erlebacher wrote:
I wish to keep the last 150 days of 7000 stocks on disk. Every day, I
would like to run an update that removes the earliest entry of every
stock, and stores the latest entry of every stock. So cache size
remains constant, but contents change.
Any ideas? Am I clear?
Disk is cheap, and getSymbols supports from and to dates.
Buy more disk.
--
Brian G. Peterson
http://braverock.com/brian/
Ph: 773-459-4973
IM: bgpbraverock
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Patrick Burns
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http://www.portfolioprobe.com/blog
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