Dear Rheannon, Try
DF = c(4, 3, 2, 1, 0, -1, -2, -3, -2, 2, 1, -1, -2, -3, -2, -1, 1, 2) sum(DF[DF<0]) [1] -17 HTH, Jorge On Tue, Jul 15, 2008 at 5:35 PM, Rheannon <[EMAIL PROTECTED]> wrote: > > Hello, > > I'd like to sum the values of a row from the first negative number (FN) to > the last negative number (LN), but not add any positive values to the sum. > Then apply this to each row of the data frame. > > For example if I have a dataframe with Row 1 values > DF = (4, 3, 2, 1, 0, -1, -2, -3, -2, 2, 1, -1, -2, -3, -2, -1, 1, 2) > I would like to sum the numbers from column 6 to column 16, but not include > column 10 & 11. > > I believe it would look something like > > function(x)while x[FN + 1] != 0 && x[FN] != LN sum(x[FN] to x[FN + 1]); FN > = > FN + 1 > > But I cant seem to get the sintax right. > Could someone help me? > Cheers, > R > > -- > View this message in context: > http://www.nabble.com/Row-Sum%2C-exclude-positive-values-tp18475407p18475407.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > [[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.
