Hi [EMAIL PROTECTED] napsal dne 25.10.2008 19:19:45:
> #is this what you want? > x <- c(-10, -5, 0, 5, 10, 15, 20) > y <- c(10, 10, 10, -5, -6, -7, 10) > data <- data.frame(x, y) > subset(data, x>0 & y==min(y)) Not exactly. But maybe y.val=which(data$y==min(data$y)) x.val=which(data$x>0) data[x.val[x.val<y.val],] can be used. Regards Petr > > On Sat, Oct 25, 2008 at 12:33 PM, Martin Ballaschk <[EMAIL PROTECTED]> wrote: > > Hi, > > > > I'm not very experienced with R and struggle with data selection from a long > > matrix with two columns. > > > > I want to cut out the data between x > 0 and min(y). > > > >> x <- c(-10, -5, 0, 5, 10, 15, 20) > >> y <- c(10, 10, 10, -5, -6, -7, 10) > >> data <- as.matrix( cbind(x, y) ) > > > >> data > > x y > > [1,] -10 10 > > [2,] -5 10 > > [3,] 0 10 _ > > [4,] 5 -5 |-- data interval > > [5,] 10 -6 _| to be selected > > [6,] 15 -7 > > [7,] 20 10 > > > > > > I need that to select the interval between a time 0 and a peak that is the > > minimum here to fit that interval via nls() later. > > > > Can anybody help? I would be very thankful for general hints how to select > > data with the help of conditions. > > > > Cheers > > Martin > > > > ______________________________________________ > > 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. > > > > > > -- > Stephen Sefick > Research Scientist > Southeastern Natural Sciences Academy > > Let's not spend our time and resources thinking about things that are > so little or so large that all they really do for us is puff us up and > make us feel like gods. We are mammals, and have not exhausted the > annoying little problems of being mammals. > > -K. Mullis > > ______________________________________________ > 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. ______________________________________________ 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.
