Wow! More than I expected. I didn't try it, but seems convincing! TK
2009/1/23 Jorge Ivan Velez <jorgeivanve...@gmail.com>: > > 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. > > ______________________________________________ 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.
