From: Mark Knecht <markkne...@gmail.com> To: r-help <r-help@r-project.org> Date: Fri, 10 Jul 2009 09:07:29 -0700 Subject: Re: [R] ReShape/cast question - sum of value in table On Fri, Jul 10, 2009 at 8:38 AM, Mark Knecht<markkne...@gmail.com> wrote: Hi Mark, You can simplify the code a bit:
> > <SNIP> > > What I need/want is that instead of displaying '1' or '2' - the > > number of events that fit these EnTime/ExTime values - I need to have > > the sum of the 'value' column from ReShape.Y. > > > > Is this possible? I'm sure it's related the the Aggregation > > requires fun.aggregate but cannot find an example of doing this sort > > of thing, or don't recognize it when I'm looking at it. > > > > Thanks, > > Mark > > > SOLVED > > It's so strange that after looking at this off and on for two days > then I suddenly discover > > cast(ReShape.Y, EnTime ~ ExTime, function(x) sum(x)) > all you really need is cast(ReShape.Y, EnTime ~ ExTime, sum) although I prefer cast(ReShape.Y, EnTime ~ ExTime, fun.aggregate=sum) for readability. Also, you may want to look at the melt function in the reshape package for the original conversion from the wide to the long form. Note that the author of the reshape package has additional resources on his website: http://had.co.nz/reshape/ -Ista > > > which does what I need: > > > cast(ReShape.Y, EnTime ~ ExTime, function(x) sum(x)) > EnTime 950 1125 1155 1210 1245 1305 1310 > 1 740 0 0 0 0 0 0 1760 > 2 750 0 0 0 0 0 0 -710 > 3 755 -1340 0 0 0 0 0 1650 > 4 800 0 0 -830 0 0 0 520 > 5 805 0 0 0 0 0 0 1080 > 6 810 0 0 0 0 0 0 -60 > 7 815 0 0 0 0 0 0 440 > 8 820 0 0 0 0 0 0 2150 > 9 850 0 -1120 0 0 0 0 0 > 10 855 0 0 0 0 -1040 0 0 > 11 925 0 0 0 0 0 0 680 > 12 935 0 0 0 -810 0 0 0 > 13 945 0 0 0 0 0 0 -340 > 14 950 0 0 0 0 0 0 -550 > 15 1125 0 0 0 0 0 -1420 0 > 16 1155 0 0 0 0 0 0 160 > 17 1210 0 0 0 0 0 0 1440 > 18 1245 0 0 0 0 0 0 110 > 19 1305 0 0 0 0 0 0 180 > > > > NOTE: There should have been a require(reshape) in the previous code > for anyone trying to look at this later. > > Cheers, > Mark ______________________________________________ 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.
