similar to: contour and persp help please

> From: Bill Simpson <wsimpson at uwinnipeg.ca> > Subject: Re: contour labelling [was "Re: [R] image ()"] > MIME-Version: 1.0 > > > We may be missing the crux here: was it to have a means of > > displaying such surfaces? > > Yes, bang on. I knew of the > existence of the Delaunay code in the R libraries. Yes I want > to make a picture that

I have this data set that both x & y are ordered vectors of length 600 & 700 respectively; z is a 600 by 700 matrix whose entry z[i,j] is either a missing value (indicated by 'NaN') or a real number between 0 and 1. The contour function contour(x,y,z) gives me a blank picture. I guess the reason is that most of z-entries are missing, only less than 1% are non missing.

Dear Uwe Ligges , I still can't finish it. *> aa* #my data x1 x2 y 5 0.05 6 4.4180 1 0.50 3 2.6979 4 0.50 9 2.9000 7 0.95 6 2.6230 8 0.95 6 2.9078 9 0.95 6 2.6727 3 1.40 3 2.4203 2 1.40 9 2.5329 6 1.85 6 2.4867 *> attach(aa)* *> persp(x1,x2,y* error in persp.default(x1, x2, y) : increasing 'x' and 'y' values expected

Hello folks, I am a beginner R user. I have been able to make a 3D surface plot using 'persp'. The surface is made by a grid of lines emanating perpendicularly from each of the x and y axes at regular intervals. I can get rid of that grid by setting 'border=NA'. Can anyone suggest some ways to replace the grid with contour lines, to create a 3-dimensional contour map? Thanks

Hello folks, i'm a R beginner and i want to put in a same plot both contour lines and persp plot. For example, fn<-function(x,y){sin(x)+2*y} #this looks like a corrugated tin roof x<-seq(from=1,to=100,by=1) #generates a list of x values to sample y<-seq(from=1,to=100,by=1) #generates a list of y values to sample z<-outer(x,y,FUN=fn) #applies the funct. across the combos of x

I've been thinking of adding the possibility of including "z" among the axes to be logged in image, contour, and persp. In the first two, it would only affect where the breaks were set if they are calculated automatically; it would have a bigger effect in persp. For example, image(x, y, z, log="z") would set 12 colours evenly spaced on a log scale of the z values.

The following matrix of normed likelihoods should give a smooth surface but instead gives a series of spikes in both persp and contour (the dim labels are the axes values). I know an algorithm cannot be infallible but it would be nice to have some parameters to control the smoothing. (It takes close to an hour to produce this matrix on a Pentium II 300mh. It was after that that it crashed with the

Dear All, I have been trying to to do this for a few days now. I can generate persp plot OK and can generate it in colour using the command persp(x,y,z,col=terrain.colors(20)) However, I was wondering if it is possible to shade the 3d surface like a contour plot. i.e. black for large z, white for small z, say Thanks in advance Colin

All, This was posted earlier but may have got lost in another thread. Can someone tell me how to independently alter the fontsize and position of labels on a persp plot?? I've tried using titles() and axes() but they seem to only apply to the standard plot() and contour plots (contour() and filled.contour(). Commands like text() seem only to add to the margin of the plot rather than

> From: Martin Maechler <maechler at stat.math.ethz.ch> > To: royle at bearmtn-e0.cgd.ucar.edu > CC: lgygax at access.unizh.ch, r-help at stat.math.ethz.ch > Subject: contour labelling [was "Re: [R] image ()"] > Mime-Version: 1.0 (generated by tm-edit 7.106) > > >>>>> "Jeffrey" == Jeffrey A Royle <royle at bearmtn-e0.cgd.ucar.edu>

R-sters: I'm interested in keeping data plotted in persp to preserve the wireframe look, I'd just like to change one of the lines drawn (in either the x or y direction) into a different color so that it stands out. Or is there some way to add a line (say, via lines(), or abline()) to a persp() plot at the designated x or y that would follow the z surface contour? I could add a line

The following plot is a first approximation to what I need: *********************************** mu1 <- 0 mu2 <- 5 s <- 1 x <- seq(-2.5, 7.5, length = 41) y <- seq(-2.5, 2.5, length = 41) f <- function(x,y){ term1 <- 1/(2*pi*sqrt(s*s)) term2 <- -1/2 term3 <- (x - mu1)^2/s term4 <- (y - mu1)^2/s term5 <- (x - mu2)^2/s term1*(.5 * exp(term2*(term3 + term4)) + .5 *

Full_Name: Ramin Nakisa Version: 1.1.0 OS: i386 linux Submission from: (NULL) (192.127.94.7) Labels created with expression seem to disappear, e.g. the x axis label in x <- -6:16 contour(outer(x, x), method = "edge", vfont = c("sans serif", "plain"), xlab=expression(theta[0]), ylab=expression(theta[1])) and all three labels in x <- -6:16 persp(outer(x, x),

I'm reading Ripley-Venables "Modern Applied Statistics with S - Fourth edition" , at the same time trying the examples proposed in the book using R 1.8.1 under linux. Now I'm trying the following code from the book (example code of spatial statistics at page 76) with R : | data(topo) library("spatial") topo.loess<-loess(z ~ x * y, topo, | degree= 2,span=0.25) |

After "image" and "persp" would it be interesting to als have contour as a generic function? Cheers Paulo Justiniano Ribeiro Jr Dept Maths & Stats - Fylde College Lancaster University Lancaster LA1 4YF - U.K. e-mail: Paulo.Ribeiro@est.ufpr.br http://www.maths.lancs.ac.uk/~ribeiro -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-

I have 3 vectors x,y,z: x<-c(-2.88,-1.92,-.96,0,.96,1.92,2.88,3.84, -1.92,-.96,0,.96,1.92,2.88,3.84, -.96,0,.96,1.92,2.88,3.84, 0,.96,1.92,2.88,3.84, .96,1.92,2.88,3.84, 1.92,2.88,3.84, 2.88,3.84, 3.84) y<-c(rep(-3.84,8), rep(-2.88,7), rep(-1.92,6), rep(-.96,5), rep(0,4), rep(.96,3), rep(1.92,2), 2.88) z<-c(.65,1.78,2.4,2.54,3.04,2.22,2.97,3.56, .745,1.287,1.98,1.91,2.02,2.24,2.95,

1. This doesn't work persp(x,y,z,col="grey",xlab="x",ylab="y",zlab="z") but I can get axis lables on x and y by persp(x,y,z,col="grey") title(xlab="x", ylab="y") BUT I can't figure out how to get a label for z. How to do it? 2. To be be consistent with image(), I think persp should make z the axis it now calls y (and

Hi guys, After all the discussion yesterday about persp and color, I decided to have a more closer look at demo(persp), and decided to write a function to generate 'topo-like' colours to plot perspectives (Thanks a lot to Uwe Ligges for his enlightning comments regarding the code in the demo). Here it goes, I believe that this function will be pretty useful to a lot of people:

I am labelling the axes of a persp() plot manually using text(). For one spot in the plot I use: text(-.62,.37,max(dprime)) The problem is that the label is printed as 1.6456330961. I would like 1.6. I tried options(digits=2) and str(digits.d=2)--no effect. (I don't like these methods anyway since I just want to modify how the label in the plot is printed; I want to print all the digits

I have a contour plot where the surface can take on positive and negative values. I would like to use solid contour lines for positive values and dotted contour lines for negative values. I saw a plot like this produced by S-Plus before. Is there a way to do this with R? If not, can anyone suggest a way to make interpretation of the contour plot easier? (Right now, it is not clear if a set of