Thanks for your answer, @Dennis Murphy: no, I don't know the functionnal form, this is purely empirical data
@ Ted Harding: Thank you for your lines of code, they are actually a pretty smart way... SW 2009/12/4 Ted Harding <ted.hard...@manchester.ac.uk>: > True enough -- ?density does not address the issue of computing > the length pf the curve! > > One simple way of implementing the idea you first thought of > would be on the following lines: > > d <- density(MyData$x) > sum(sqrt(diff(d$x)^2 + diff(d$y)^2)) > > which simply sums the lengths of the line-segments. You would > get a better approximation to the ideal length by increasing > the value of 'n' in the call to density() (perhaps as a separate > calculation, since a relatively small value of 'n' is likely > to be adeqaute for plotting, but possibly inadequate for the > accurate computation of the length). > > Hpoing this helps, > Ted. > > On 04-Dec-09 12:41:22, sylvain willart wrote: >> Yes, sure (and I just did it again) >> but I can't see an answer... did I miss sthg ? >> >> regards, >> >> SW >> >> 2009/12/4 milton ruser <milton.ru...@gmail.com>: >>> hi Sylvain, >>> >>> did you try ?density >>> >>> regards >>> >>> milton >>> >>> On Fri, Dec 4, 2009 at 7:19 AM, sylvain willart >>> <sylvain.will...@gmail.com> >>> wrote: >>>> >>>> Hello R users, >>>> >>>> When I type >>>> >>>> d <- density(MyData$x) >>>> >>>> I obtain a density object I can plot, >>>> >>>> But I wonder if there is a way to easily compute the length of the >>>> density curve ? >>>> >>>> ( I imagine I could compute the distances between the 512 equally >>>> spaced points using their x and y, but does it exist a smarter way ?) >>>> >>>> Regards, >>>> >>>> SW >>>> >>>> ______________________________________________ >>>> 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. > > -------------------------------------------------------------------- > E-Mail: (Ted Harding) <ted.hard...@manchester.ac.uk> > Fax-to-email: +44 (0)870 094 0861 > Date: 04-Dec-09 Time: 13:02:27 > ------------------------------ XFMail ------------------------------ > ______________________________________________ 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.
