similar to: Subset and logical operator error

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, 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 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 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

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

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

Dear R users, I am currently writing the documentation for my first package. I have created a short user manual using sweave/pdflatex which is distinct from the manual/summary-of-package-functions created by R CMD CHECK. I was wondering how could I seamlessly combine both documents. Thanks for your help Sebastien [[alternative HTML version deleted]]

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 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 am quite surprised to see that mtext gives different results when it is used with 'pairs' and with "plot'. In the two following codes, it seems that the 'at' argument in mtext doesn't consider the same unit system. I would appreciate your comments on this issue. Sebastien ##### Pairs mydata<-data.frame(x=1:10,y=1:10) par(cex.main=1,

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, 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 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

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

Hi all, So let's say I have a matrix, mdat and I only know the index number. How do I retrieve the column and row names? For example, > mdat <- matrix(c(1,2,3, 11,12,13), nrow = 2, ncol=3, byrow=TRUE, dimnames = list(c("row1", "row2"), c("C.1", "C.2", "C.3"))) > mdat[4] [1] 12 >

Dear R-users, I am using plot symbols given by pch=21:25 in a xyplot. The background color of these symbols can be defined by 'fill' in the panel argument, however I have a hard time to find how to define the same background color in the key. I tried different options like using the auto.key argument and modifying the par.settings, or using normal key argument plus 'fill',

Dear R-users, Is there a easy way to access to a complete listing of available functions from a R session? The help.start() and ? functions are great, but I feel like they require the user to know the answer in advance (especially with respect to function names)... I could not find a easy way to simply browse through a list of functions and randomly pick one function to see what is does. Is

Hi, First let me say I am a big fan of R and appreciate all your time and effort. The update() function does not seem to work in a for loop. Consider the following: mdat <- matrix(c(1,2,3, 11,23,13, 12,4,8), nrow = 3, ncol=3, byrow=TRUE) reg <- lm(mdat[7:9]~1) for(i in 1:2) { reg <- update(reg,.~.+mdat[((i-1)*3 + 1):(i*3)]) #update reg twice } reg # reg should have two independent