similar to: Define tick mark width

Dear R-users, By default, the xyplot function automatically defines the axis ranges based upon the content of y and x variables. However, when one includes some calls to other panel.<something> functions in the panel argument, the results might be out of range and not show up in the final graphs (see lower ends of the loess line in the following example). Is there a way one can capture the

Dear R-users, I would like to know if there is a function (in base R or the extension packages) that would automatically detect the break points in a vector x for later use in the cut function. The idea is to determine the boundaries of the n intervals (n>=1) delimiting clusters of data points which could be considered "reasonably" close, given a numerical vector x with unknown

Dear R-users, I have found this not-so-recent post in the archives - http://tolstoy.newcastle.edu.au/R/devel/00a/0291.html - while I was looking for a particular way to reorder factor levels. The question addressed by the author was to know if the read.table function could be modified to order the levels of newly created factors "according to the order that they appear in the data

Dear R-users, I am trying to produce trellis (png, or jpeg) graphs with transparent background, but I cannot manage to make that happen. I tried to play around with themes but to no avail. Any advise on the following example will be greatly appreciated: Thank you Sebastien #### library(lattice) df <- data.frame(a=rep(1:4,4), b=rep(1:4,4), c=rep(1:4,each=4)) settings <- standard.theme()

Dear R-users, I am trying to port to R something that I wrote in Matlab to perform model parameter optimization using the Nelder-Mead simplex method (fminsearch). I read the help on ?optim (which seems to be the way to go) as well as a bunch of posts on the topic, but I would like to make sure about something before I spend to much time trying to reproduce something that is not possible. The

Dear R-users, I need to dynamically recognize the index of a given string myStr in a vector of string. The problem is that myStr might contain parenthesis, causing grep not to recognize it the way I want (see below). The help mentions that the pattern used by grep should be in the POSIX format... I guess the problem is here; unfortunately, I am not familiar with the subtleties of the POSIX

Dear R-users, The help does not give much details on the use of the arguments 'from' and 'to' in the panel.abline function. I have looked in the archives but did not find how to implement them. My different tries failed miserably. E.g, the following code doesn't seem to work, in a sense that the line is not limited to the (0,10) range. Do these arguments really apply to

Dear R-users, I have found on the list several posts addressing the issue of getting data for a list of defined files. However, I found nothing about scanning a given folder and retrieving the list of, let's say, .txt files (I probably used the wrong keywords). Could someone tell me which posts or function help I should look at? Thanks in advance Sebastien

Dear R-users, The strsplit function does not exist in S-plus and I would like to use it. How could I reproduce the function in Splus or access to its source code? Thank you in advance, Sebastien

Dear R-users, In the R internals manual, it is said that one can extract the elements of the dot-dot-dot argument using the special symbols ..1 or ..2. It seems to work just fine but I was wondering if there is a way one can extract or modify the content of the dot-dot-dot argument using a level name instead of its position? For instance, assuming that list(...) returns: $a [1] 1 2 3 4 5

Dear R-users, The following code splits a very simple dataframe into a list, each element of the list being one line of the dataframe. You will see that the split function names each element of the list by using uses the content of a and b and merging them with a "." character. Is there a way to customize this character? a<-1:10 b<-21:30 mydata<-data.frame(a,b)

Dear R users, I am currently trying to create my first personnal function and use it with the apply function. The purpose of this function is to create a vector summarizing the number of levels in a given selection of data.frame columns. I tried to transpose the indexation method used by the nlevels function but it doesn't seem to work. I did not find anything uesful in the archives so

Dear R-users, I would need some advices on the proper way to call a particular function. This function is called scope.char and it is embedded in the step.gam function from the gam package. I am trying to call scope.char directly in a script but I did not find the proper way to do so. Is this even possible? If so, what is the proper syntax? Thank you for your time and help. Sebastien

Hello everyone, Very quick question: How should I cite the use of R in a publication ? Thanks in advance. Sebastien

Dear R-users, I want to give a try to Sweave and Latex but I am having some problems compiling my .Rnw files within Kile. I have followed the recommendations given in http://tolstoy.newcastle.edu.au/R/e5/help/08/10/4277, but they do not seem to address my particular problem. I am using R 2.11.0 and Kile v 2.0.83 on an OpenSUSE11.2 installation (KDE 4.3 environment). According to the log (see

Dear R users, Here is a couple a quick questions, for which I was unable to not find any answer in the list archives and in the help: 1- Is there any R equivalents of the VB functions Cint, CStr, etc... (for non VB users, these functions transform the category of a specified variable and smartly adapt the value of this variable) ? I have tried to use the as.numeric, as.factor and as.vector

Dear R-users, I have written a short VB application to clean and format my R code. Everything works fine except one small issue that I did not expected; it is related the automatic replacement of assignment signs from "=" to "<-". Most functions or arguments seem to accept either = or <-, but some don't (e.g. ls(all=TRUE)). The result is that my supposedly clean

Dear R users, I have to import some csv files in which column headers contain the character "~". Following the following import call, the character seems to be replaced by dots in the column names of my data frame. Plus, I cannot query names(mydata) to find the column index which header should contain "~" or "." > mydata <-

Dear R-users, The following code splits a very simple dataframe into a list, each element of the list being one line of the dataframe. You will see that the split function names each element of the list by using uses the content of a and b and merging them with a "." character. Is there a way to customize this character? a<-1:10 b<-21:30 mydata<-data.frame(a,b)

Dear R-users, I have created a bunch of R scripts that automatically create multiple plots, all saved in a pdf device. I initially chose pdf output in order to easily access to multiple plots in a single file. Now, I am trying to play with different devices, like png or eps and I realize that the settings I used to have nice plots in a pdf device are giving awful outputs with the other