Hi, I'm joining in with a question -- is it possible to vary the color of the lines along z? The 'colors' argument doesn't seem to allow a vector in this situation.
Thanks, baptiste On 21 November 2010 21:02, Carl Witthoft <c...@witthoft.com> wrote: > Thanks, Dennis. Here's an enhanced version: > > z <- seq(-10, 10, 0.1) > zm<-cbind(z,z,z,z,z,z,z,z,z,z) > > ym<-matrix(nr=201,nc=10) > for (i in seq(1,201)) { > for (j in seq(1,10)) ym[i,j]<-j/10*sin(zm[i,1])} > > xm<-matrix(nr=201,nc=10) > for (i in seq(1,201)) { > for (j in seq(1,10)) xm[i,j]<-j/10*cos(zm[i,1])} > > > scatterplot3d(as.vector(t(xm)), as.vector(t(ym)), as.vector(t(zm)), main = > 'Helix', pch = ".",type='l') > > > From there I can draw a few helical lines by modifying your original code > (for different radii), and end up with a pretty decent "mesh surface." > > Carl > > > On 11/20/10 12:03 PM, Dennis Murphy wrote: >> >> Hi: >> >> Here's an example stolen out of the scatterplot3d package vignette (p. 9): >> >> library(scatterplot3d) >> z<- seq(-10, 10, 0.01) >> x<- cos(z) >> y<- sin(z) >> scatterplot3d(x, y, z, highlight.3d = TRUE, col.axis = 'blue', >> col.grid = 'lightblue', main = 'Helix', pch = 20) >> >> HTH, >> Dennis >> >> On Sat, Nov 20, 2010 at 8:29 AM, Carl Witthoft<c...@witthoft.com> wrote: >> >>> Hi, >>> I need some help either in how to configure variables for wireframe(), or >>> some suggestions as to other graphics commands to use for plotting a 2-D >>> manifold in 3-D space. >>> >>> Here is an example I tried (in the hopes that it would plot a helical >>> line) >>> : >>> >>> xsp<-matrix(c(cos(seq(0,80)/5)),9,9) >>> ysp<-matrix(c(sin(seq(0,80)/5)),9,9) >>> zsp<-matrix(c((seq(0,80)/20)),9,9) >>> wireframe(zsp~xsp*ysp) >>> >>> The resulting plot looks vaguely like a helix, but not right. And if I >>> change my variables' dimensions to c(3,27) it looks "better," but if the >>> dims are c(1,81), nothing gets plotted. >>> >>> So: is there a way to control which points are connected by lines in >>> wireframe()? Or is there a more appropriate way to provide a plotting >>> program with sets of coordinates in 3-space? >>> >>> My primary goal is to be able to plot surfaces, not just a line as in my >>> sample code. For example, I might expand the data above to represent >>> points >>> on a 'ribbon' helix. >>> >>> Thanks for yr. help -- feel free to point me to help files for existing >>> packages or plotting routines. >>> >>> Carl >>> >>> ______________________________________________ >>> 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. > ______________________________________________ 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.