Is there a way in which I can setup a model like that? Regards, Ankur Seth
On Sat, Sep 7, 2013 at 4:49 PM, Rui Barradas <ruipbarra...@sapo.pt> wrote: > Hello, > > It will not change the value automatically, you will have to rerun the > code. > > Rui Barradas > > Em 07-09-2013 11:52, Ankur Seth escreveu: > >> Thanks Rui, but this does not change the value in the new column >> automatically if I change the value in the data column. Any ideas? >> >> Regards, >> Ankur Seth >> >> >> On Sat, Sep 7, 2013 at 2:11 PM, Rui Barradas <ruipbarra...@sapo.pt> >> wrote: >> >> Hello, >>> >>> Try the following. >>> >>> dat <- read.table(text = " >>> >>> Date Value >>> 08/01/2013 100 >>> 08/02/2013 100.5 >>> 08/03/2013 102 >>> ", header = TRUE) >>> >>> >>> dat$New <- c(NA, diff(dat$Value)) >>> dat >>> >>> >>> Hope this helps, >>> >>> Rui Barradas >>> >>> Em 07-09-2013 06:06, Ankur Seth escreveu: >>> >>> Hello All, >>>> >>>> I am trying to build a model in R. I am facing the following problem... >>>> >>>> My Data Frame contains the following data... >>>> >>>> Date Value >>>> 08/01/2013 100 >>>> 08/02/2013 100.5 >>>> 08/03/2013 102 >>>> .... >>>> >>>> Now I want to add a column to this data frame where New Column Value = >>>> Difference of two subsequent observations. For Eg. on 08/02/2013 the new >>>> value = 100.5 - 100=0.5 >>>> >>>> I want to do this dynamically such that if I change the value in Value >>>> column the new column should recalculate automatically. >>>> >>>> Is there a way to do this in R? >>>> >>>> Regards, >>>> Ankur Seth >>>> >>>> [[alternative HTML version deleted]] >>>> >>>> ______________________________****________________ >>>> R-help@r-project.org mailing list >>>> https://stat.ethz.ch/mailman/****listinfo/r-help<https://stat.ethz.ch/mailman/**listinfo/r-help> >>>> <https://stat.**ethz.ch/mailman/listinfo/r-**help<https://stat.ethz.ch/mailman/listinfo/r-help> >>>> > >>>> PLEASE do read the posting guide http://www.R-project.org/** >>>> posting-guide.html >>>> <http://www.R-project.org/**posting-guide.html<http://www.R-project.org/posting-guide.html> >>>> > >>>> >>>> and provide commented, minimal, self-contained, reproducible code. >>>> >>>> >>>> >> >> -- Regards, Ankur Seth [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
