Hi, Like this perhaps?
> slope = diff(y) / diff(x) > str(slope) num [1:499] 1.5068 -1.8406 2.1745 0.0676 -2.6088 ... HTH, baptiste 2009/10/8 FMH <kagba2...@yahoo.com>: > Dear All, > > Let 499 piece-wise lines were buit up by 500 pair of observations, via R > code below. > > x <- 1:500 > y <- rnorm(500) > plot(x, y, type = 'b') > > I was trying to compute all the slopes for the lines which were connected > between two adjacent points. For instance, slopes of lines between first and > second points, second and third points, and so on, until between points 499 > and 500, respectively, but sadly, i never found a suitable function do this > computatation efficiently. > > Could someone please advice me on doing this? > > Thank you > Fir > > > > ______________________________________________ > 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.
