Re: [R] iterating over a data frame the R way?

On Dec 31, 2009, at 5:46 PM, William Dunlap wrote: mytable$duration <- mytable$end_time - mytable$start_time mytable start_timeend_timeduration 1 2009-12-31 15:27:00 2009-12-31 15:27:00 0 secs 2 2009-12-31 16:27:00 2010-01-01 15:27:00 82800 secs ... 11 2010

Re: [R] iterating over a data frame the R way?

> -Original Message- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of Gabor Grothendieck > Sent: Thursday, December 31, 2009 3:15 PM > To: donahc...@me.com > Cc: r-help@r-project.org > Subject: Re: [R] iterating over a

Re: [R] iterating over a data frame the R way?

Here are a couple of R-type commands on a data.frame. >> >> mydata  <- data.frame(vec1 =  seq(19,109, by=10), >> vec2 =seq(30,120, by=10)) >> >> mydata[,1]+mydata[,2] >> apply(mydata, 2, mean) >> >> >> >> --- On Thu, 12/31/09, donahc...@me

Re: [R] iterating over a data frame the R way?

nt to do to it/them? Here are a couple of R-type commands on a data.frame. mydata <- data.frame(vec1 = seq(19,109, by=10), vec2 =seq(30,120, by=10)) mydata[,1]+mydata[,2] apply(mydata, 2, mean) --- On Thu, 12/31/09, donahc...@me.com wrote: From: donahc...@me.com Subject: [R] iterati

Re: [R] iterating over a data frame the R way?

me.com > Subject: [R] iterating over a data frame the R way? > To: r-help@r-project.org > Received: Thursday, December 31, 2009, 2:44 PM > Hi, > > I have a data frame that was create by issuing a select > against my sqlite database.  I want to get each row > from the data frame

[R] iterating over a data frame the R way?

Hi, I have a data frame that was create by issuing a select against my sqlite database. I want to get each row from the data frame and use the each of the column values. The data frame looks like this: start_timeend_time 09:30:00 10:00:00 10:00:01 10:30:00 etc Can a point m