similar to: rgl and lighting

Dear RGL experts, I haven't been able to add greek letters to my rgl plot3d. I have tried "expression" with no success. Here is the interested bit: > library(rgl) > cb <- cube3d() > plot3d(cb,xlab=expression(alpha),ylab="",zlab="",box=FALSE,alpha=0.5) The expression(alpha) appears as "alpha", rather than as a greek symbol. I suspect greek

Dear R community, I would be greatful if somebody could shed light on the following. I have created a set of 6 points to check how centroid agglomeration works in cluster analysis: > Y <- data.frame(x=c(-1,1,1,-1,10,12),y=c(1,1,-1,-1,0,0)) It is quite intuitive to understand that the last clusters to be joined will be {1,2,3,4} with {5,6}. Now, the centroid for the first cluster has

Dear R developers, I have a new class, which I called "Molecule", and have tried to define = a "+" operation for 2 objects of this class. This is what I have written so far, although the method is not complete = (I'm trying to look at it at intermediate stages): setMethod( f=3D"+", signature(x=3D"Molecule",y=3D"Molecule"),

Dear R gurus and users, I seem to have problem finding the right tool for plotting convex hulls over 2D plots, after a cluster analysis. In fact I would like to draw a convex hull in 2D for a generic group of points. I found a "convhulln", but this doesn't seem to give me a convex hull. Here is what I do: > library(mvtnorm) > Mean <- c(2,1) > Sigma <-

Dear R community, I would like to source a file in my linux system to set a few environment variables. I have tried: > system("source /home/james/build//ccp4-6.1.13/include/ccp4.setup") and got: sh: source: not found In fact, using Sys.which("source") I get an empty string. How can I source that ccp4.setup file from within an R session? J Dr James Foadi PhD Membrane

Dear R community, I'm trying to develop a fast way of summing specific rows of a large data frame. Here is an example of the kind of data frames I'm dealing with: > refls H K L M/ISYM BATCH I SIGI 43247 1 0 5 21 79 61.44117 2.20553 1040 1 0 5 257 6 15.16316 0.54431 2324 1 0 5 257 5 46.76152 1.67858 31515 1 0 5 259 60 57.97305

Dear R users/gurus, I have recently installed Ubuntu 7.10 (Gutsy) on my Dell Latitude D520. First time for me, as I have always used Fedora. R installation using "apt" has proceeded fine, both for r-base and r-base-dev. Next, I need to install various other packages, "rgl" being first in the line. I have sorted some preliminaries by installing headers for X11 and Mesa: sudo

Dear all, I have a very small script to plot a function. Here it is: ########################################## sinca <- function(N,th) { return(sin((N+0.5)*th)/sin(0.5*th)) } plot_sinca <- function(N) { x <- seq(-5*pi,5*pi,by=pi/100) y <- rep(0,length=length(x)) for (i in 1:length(x))y[i] <- sinca(N,x[i]) plot(x,y,type="l",ylim=c(0,2*N+4)) return(c(x,y)) }

Hi, I'm using rgl to generate a 3D surface plot and I'm struggling to get the lighting correct. Currently the surface gets plotted, but is very 'shiny'. On rotating the view, I get to see parts of the surface - but overall I don't see much detail because of the spotlight like lighting. I've played around with the specular, ambient and diffuse but I can't

Dear R gurus and users, I'm having problems with the use of write.table. I have a 28-variables data frame create at each cycle of a loop; it can contain between 2000 and 3000 rows for each cycle. After each cycle the data frame is written out to a file with the "append=TRUE" option and then removed from memory. These are the couple of lines involved: > data2 <-

Dear all, While running some code requiring the "tcltk" package I have realised that my version of R was compiled with the Tcl/Tk libraries included in Fedora 6. It would be for me better to use the ActiveTcl libraries (which I have under /usr/local), and I'm aware that this probably means to recompile R with the proper configuration variables. But...is it by any chance

Dear R community, I'm in the process of writing a package. One of the functions reads a whole ascii file, full of data: > SYMINFO <- scan("/file/full/of/data.txt",what="character",sep="\n",quiet=TRUE) SYMINFO is now an array character with roughly 14000 elements. I thought the best way to use this file in the package was to list it, together with the

Hello All, I wanted to perform a fourier transform on high frequency financial data. I have searched and have not found much on this topic for R. I was wondering if anyone has used any libraries for it or have come across any papers I may read. Many Thanks, Neil Gupta [[alternative HTML version deleted]]

Hello useRs, I would like to draw a 3D-surface using rgl with a point-like light-source within the scene, that is with finite distance of the light-source to the surface to be lit. >From the help to the 'light3d' command I read: "They [the light-sources] are positioned either in world space or relative to the camera using polar coordinates." which *could* be understood as

Hola, tengo unos datos clasificados en tres grupos y quiero representarlos en un cubo de forma que cada grupo tenga un color/ símbolo distinto. He conseguido hacerlo por colores (código) y me gustaría hacerlo variando el 'pch'. He intentado hacerlo del mismo modo pero no funciona. ¿Se puede hacer?¿Puede ayudarme alguien? Muchísimas gracias. Elvira. library(scatterplot3d) # dummy data

Dear all, I have looked for an answer for a couple of days, but can't come with any solution. I have a set of functions, say: > t0 <- function(x) {1} > t1 <- function(x) {x} > t2 <- function(x) {x^2} > t3 <- function(x) {x^3} I would like to find a way to add up the previous 4 functions and obtain a new function: > rrr <- function(x) {1+x+x^2+x^3} without,

Dear all, I have tried installing "rgl" with the usual command: R CMD INSTALL rgl_0.67-2.tar.gz Differently from what happened last time I have succesfully installed this package, this time there was a failure: ... ...g++ -I/usr/lib/R/include -I/usr/lib/R/include -I -DHAVE_PNG_H -I/usr/include/libpng12 -I/usr/local/include -fpic -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2

Hello. I wonder if anyone can help me with this. I'm performing cluster analysis by using hclust in stats package. My data are contained in a data frame with 10 columns, named "drops". Firs I create a distance matrix using dist: distanxe <- dist(drops) Then I perform cluster analysis via hclust: clusters <- hclust(distanze) At this point I want to view the tree

I'm using the command below on an open3d() object to create a shaded cube. Changes to myScalingFactor do not effect changes in the size of the cube. What is the correct approach? Mark shade3d(translate3d(cube3d(identityMatrix() * myScalingFactor),-6,1,-1),col="green", alpha = 0.2) -- Mark W. Kimpel MD ** Neuroinformatics ** Dept. of Psychiatry Indiana University School of Medicine

Dear Rglers, With rgl, I would like to set marker when a button is pressed, but leave the standard trackball handling otherwise. Thanks to Duncan and Oleg for helping me handling key down. How do I say in a custom mouse handler "after having done your work, forward to standard trackball once only"? The example below shows the idea, but it works only once, then reverts to standard