need more help.... Re: iterating over a data frame the R way?
Hum. data.frame was left off. Trying again... -------------- next part --------------
On Jan 1, 2010, at 10:20 AM, donahchoo at me.com wrote:
Okay, I don't know if I'm blocking because of my other programming language experience of if I'm just being dense. I have a data.frame with high,open,low,last,day, and start_time time columns. What I want to do is get all the rows with the same day and process each of those columns. If I was able to run a query against the data.frame I would be want something like: result = all the rows where the day is equal to 2007-12-05 Then I would want get max(result["high"]), min(result["low"]) How do I do this? I tired sqldf, but its complaining about libtcl0.5.8 not being found. I'm on OS X 10.5.8 and haven't yet tired to install a new version of tcl in /usr/local. Here's the dataframe:
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