Hi G See, Thanks but I have been watching "?merge" hundreds of times...
It's very terse and there are lots of hidden tricks... Thanks a lot any way! And thanks a lot for all the help folks! On Tue, Jan 24, 2012 at 2:53 AM, G See <[email protected]> wrote: > Michael, > > Maybe you do not realize that when someone writes a word with a > question mark in front of it, it means that you should look at the > help page for that function. For example, if you type "?merge" in an > R terminal (without the quotes) it will open the help page for that > function. Another option is to type help(merge) > > Hope this makes it easier for you to find answers in the future, > Garrett > > On Mon, Jan 23, 2012 at 5:53 PM, Michael <[email protected]> wrote: > > Oh I forgot one thing: > > > > xts_one and xts_two are not neccessarily the same length... > > > > In effect, I was looking for a time series set-operation "intersect".... > > > > Thank you! > > > > On Mon, Jan 23, 2012 at 12:35 PM, Jun Zhu <[email protected]> wrote: > > > >> Assume you are testing the first column > >> > >> l_result <- ifelse(l_xts_one[,1] == l_xts_two[,1], l_xts_one[,1],NA) > >> > >> > >> > >> > >> --- On *Mon, 1/23/12, Brian G. Peterson <[email protected]>* wrote: > >> > >> > >> From: Brian G. Peterson <[email protected]> > >> Subject: Re: [R-SIG-Finance] How do I intersecttwo time series? > >> To: "Michael" <[email protected]> > >> Cc: "r-sig-finance" <[email protected]> > >> Date: Monday, January 23, 2012, 8:25 AM > >> > >> On Mon, 2012-01-23 at 08:06 -0600, Michael wrote: > >> > I have two xts objects...and they have coulmns with the same names.ie > >> > their column represent the same variables. > >> > > >> > The only difference is that the values in the rows may be different. > >> > At > >> > precisely the same timestamps the observations can be exactly the > >> > same. > >> > > >> > How do I find the intersection of these two time series ie the rows > >> > where > >> > the observations are identical including the time stamps? > >> > > >> > How do I find intersection where a few specified coulmns are identical > >> > including the time stamps? > >> > > >> > Thanks a lot! > >> > >> ?merge > >> > >> ?ifelse > >> > >> merge is amply covered in the xts documentation, and ifelse is covered > >> in many write-ups on vectorized operations in R. > >> > >> _______________________________________________ > >> [email protected]< > http://mc/[email protected]>mailing list > >> https://stat.ethz.ch/mailman/listinfo/r-sig-finance > >> -- Subscriber-posting only. If you want to post, subscribe first. > >> -- Also note that this is not the r-help list where general R questions > >> should go. > >> > >> > > > > [[alternative HTML version deleted]] > > > > _______________________________________________ > > [email protected] mailing list > > https://stat.ethz.ch/mailman/listinfo/r-sig-finance > > -- Subscriber-posting only. If you want to post, subscribe first. > > -- Also note that this is not the r-help list where general R questions > should go. > [[alternative HTML version deleted]] _______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-sig-finance -- Subscriber-posting only. If you want to post, subscribe first. -- Also note that this is not the r-help list where general R questions should go.
