aggregate
In fact since you have dates and not datetimes use as.Date() instead of strptime().
On 5/11/05, bogdan romocea wrote:
Assuming dfr["day","o","h","l","c"] and day like 2004-12-28: dt <- strptime(as.character(dfr$day),format="%Y-%m-%d") + 0 wk <- format(dt,"%Yw%U") aggr <- aggregate(list(dfr$o,dfr$h,dfr$l,dfr$c),list(wk),mean) colnames(aggr) <- etc -----Original Message----- From: Omar Lakkis [mailto:uofiowa at gmail.com] Sent: Wednesday, May 11, 2005 3:45 PM To: r-help at stat.math.ethz.ch Subject: [R] aggregate I have a data frame of daily open, high, low and settle prices. How can I aggregate this data weekly? The data frame has five columns, the first is the date column and the rest are the prices.
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