similar to: prevent export of specific functions in NAMESPACE

Hi, I have a data.frame that has a categorical variable, for which I would like to look at the distribution of levels of this variable, based on a grouping of two other variables. As an example: x <- data.frame(obs=sample(c('low', 'high'),100, replace=TRUE), grp1=sample(1:10, 100, replace=TRUE), grp2=runif(100)) cut.grp1 <- cut(x$grp1, 3) cut.grp2 <- cut(x$grp2, 3)

Hi, I have a data.frame with columns named X, D1, D2, D3 I know I can get a single plot with 3 curves by doing xyplot(D1 + D2 + D3 ~ X, data) but in some cases I might have columns D1 ... D10. Is there a way to plot all 10 columns without having to specify each individual term? (By analogy with formulae in lm, I thought, xyplot(. ~ X, data) would work, but it didn't) Thanks, --

Hi, I have a lattice lot conditioned on two variables. Example code is: library(lattice) x <- data.frame(d=runif(100), f1=sample(c('yes', 'no'),100,replace=TRUE), f2=c(rep('Run1',30),rep('Run2',30),rep('Run3',40))) histogram(~d | f1 + f2, x) In the plot, for a given value of f2, there are two panels, one for 'n'

Hi, while working with decision trees and unbalanced data, I came across the use of the Hellinger distance as an alternative to information gain [1,2], when dealing with skewed data. Does anybody know of R implementations of this approach to decision trees? Thanks, [1] http://www.cse.nd.edu/Reports/2008/TR-2008-06.pdf [2] http://csmr.ca.sandia.gov/~wpk/slides/wdmda-sem.pdf -- Rajarshi Guha NIH

Hi, I have a series of lattice plots which I am arranging in a 2x2 grid via print: print(p.preds, split=c(1,1, 2,2), more=TRUE) print(p.comp, split=c(2,1,2,2), more=TRUE) print(p.bw, split=c(1,2,2,2), more=FALSE) What I'd like to have is a letter (A, B, ...) in the top corner of each plot. While panel.text lets me add text anywhere within a plot, I can't seem to workout how I could put

Hi, I'd like to use a custom color sequence (black - low values, green - high values) in am image() plot. While I can specify colors (say a sequence of grays) to the col argument, the ordering is getting messed up. I have two questions: 1. How can I get a sequence of say 256 colors starting from black and ending in green? 2. How is this specified to image() such that it uses the colors in

Hi, I have a vector of data, that I group based on two factors via tapply. For each such grouping I would like to plot a pie chart. I can layout these pie charts in a matrix layout, correpsonding to the levels of the two factors. But I am getting stuck on how to label the rows and colums. My current approach looks like this: x <- data.frame(obs=sample(c('low', 'high'),100,

Hi, I've been struggling with a lattice visualiation. I have a data.frame with 4 columns. What I'd like to have is a set of 3 panels. Ecah panel will have the first column plotted against serial number and then will superimpose the relevant column. My non-lattice version is as follows: x <- data.frame( ... ) par(mfrow=c(3,1)) for (i in 2:4) { plot(x[,1]) points(x[,i]) } Any

Hi, I am trying to use a CGI service (Pubchem PUG) via RCurl and am running into a problem where the data must be supplied via POST - but I don't know the keyword for the argument. The data to be sent is an XML fragment. I can do this via the command line using curl: I save the XML string to a file called query.xml and then do curl -d @query.xml

Hi, I have seen the answer to this sometime before but I just can't find it again - pointers appreciated. I have a package that contains some data.frames saved as .Rda files in the data/ directory. When the package is loaded I would like to have them be available in the workspace (without the user having to explicitly load them using data(...)). If my package does not use a NAMESPACE, I can

Hi, I have some code that uses rJava. One of the Java side methods returns a byte[] representing the bytes from a PNG image. What I'd like to do is to be able to bring up the PNG on the R side (I can bring up a Swing window to show the PNG but I want to avoid that). I have looked at the pixmap and rimage packages but don't seem to be able to work out how I'd go about this (or if

Hi, I have a plot and I would like to overlay a PNG image over it. I'm using the rasterImage function to do this, but the problem I'm facing is working out the coordinates of the upper right corner of the final image in user coordinates. That is I can place the image so the lower left is located at the bottom of the y-axis and the left end of the x-axis. Since my image is say 100px x

Hi, is there a way to plot distribution curves (say normal or chi sq etc) from within R? For example I looked up the *chisq family of functions but I'm not sure as to how I would use them to generate a plot of the chi sq distribution (for arbitrary d.o.f). Thanks, ------------------------------------------------------------------- Rajarshi Guha <rajarshi at presidency.com>

Hi, I have 3 lists, x, y, z and I'd like to perform a calculation over all the lists simultaneously. If it were a single list I could use lapply, but for more than one list I'm using a for loop. Is there an idiom that would let me use something like lapply, but the function specified to lappy would have access to an element from each list? (In Python, I would have used for a,b,c in

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, I'm a new user of R and have managed to make a plot of a histogram. Is there any way I set the title and axes labels and then save the plot as an image (png/gif)? Thanks - -- - ------------------------------------------------------------------- Rajarshi Guha <rajarshi at presidency.com> <http://jijo.cjb.net> GPG

Hi, I'm running a calculation in two ways. The first way is to employ vectors and evaluate a function in one go. The second way is to break down the function into pieces and combine the pieces to the final answer. Algebraically, they should give me the same result. But the final vector differs significantly. I must be missing something very obvious, but I just cannot see it xx <-

Hi, is the following possible - in a given session I make a lot of objects and save when exiting. Usually I note down seperately what each object is about. Is it possible to attach data to any object which would essentially be a short note explaining the meaning of it? Thanks, ------------------------------------------------------------------- Rajarshi Guha <rxg218 at psu.edu>

Hi, this question is probably very obvious but I just cant see where I might be going wrong. I'm using the lm() function to generate a linear model and then make predictions using a different set of data. To generate the model I do (tdata & pdata are matrices of observations and parameters, tdepv, pdepv are response vectors) x <- as.data.frame(tdata) x$tdepv <- tdepv

Hi, I'me trying to write a function that will shuffle a vector. At the moment I'm baically making a vector of randomized indices and then making a new vector from the original one using these random indices. However, is there an alternative (more elegant) method to do this? I tried help.search('shuffle') but it does'nt return anything relevant. Thanks,

Hi, I have some data which I was plotting using image(). I wanted to add a vertical color key to the plot and I found that heatmap.2 in gplots does let me add a color key. However, I was thinking of a vertical bar with the color range rather than the style that gplots provides. Is there any package (or code snippet) that would let me add a vertical color key to an image() or heatmap