Dear Todor, How about this? x<-c(1,-1,2,-2,3,-3,4,-4,5,-5) y<-c(1,0,2,0,3,0,4,0,5,0) DF<-data.frame(x,y) plot(with(DF,DF[order(x),]),type='o')
HTH, Jorge On Fri, Jan 23, 2009 at 1:41 PM, Todor Kondic <doliche...@gmail.com> wrote: > Ok, here is a bit more information: > > R is version 2.7.1 (2008-06-23) > > A constructed example: > .... > > x<-c(1,-1,2,-2,3,-3,4,-4,5,-5) > > y<-c(1,0,2,0,3,0,4,0,5,0) > > plot(x,y,type='l') #bad > > plot(x,y) # this is how it should look like > .... > > So what we should see here is a flat y=0 for x<0 and identity for x>0. > Instead, we have a saw-like shape where e.g y(x=-1) is connected to > y(x=1) . > > This is of course minor (actually asymptotically, no annoyance at > all). I am just mentioning it for 'completness' sake and because a > divinely ideal plotting function should cope with data given in any > order. > > Cheers! > > TK > > Cheers, > > TK > > > > 2009/1/23 jim holtman <jholt...@gmail.com>: > > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > > > A sample of data causing the problem would help. It is most likely > > the way you have it specified. > > > > On Fri, Jan 23, 2009 at 11:37 AM, Todor Kondic <doliche...@gmail.com> > wrote: > >> Hello, > >> > >> I have 2d data where x coordinate is not given in usual ascending > >> order (x1,...,x1+l; l>0), and instead in another, regular, but not > >> ascending or descending order (for illustration: > >> x1,-x1,x1+dx1,-x1-dx1,....).y is an array which corresponds to the way > >> x is ordered. I have noticed that giving 'plot(x,y,type='l') produces > >> a plot where the points are connected in a completely wrong way. It is > >> as the plot/lines assumes an ascending order between the succesive y > >> points ignoring the fact that they are not (it connects y(x1) with > >> y(-x1), for x1+dx). I don't know whether this could be a bug, because > >> maybe sorting the y coordinates appropriately and then interpolating > >> lines plotting is too much to ask of the plot function. But, I've felt > >> like sharing :-) > >> > >> Additionally, 'points' function will plot the data properly. > >> > >> Cheers, > >> > >> TK > >> > >> ______________________________________________ > >> 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. > >> > > > > > > > > -- > > Jim Holtman > > Cincinnati, OH > > +1 513 646 9390 > > > > What is the problem that you are trying to solve? > > > > ______________________________________________ > 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.
