similar to: Finding a folder at the root level of an unknown drive

Colleagues, I have encountered the following situation in R (2.9.0) with Windows XP. I have an application that calls Rterm.exe. In certain situations, the application terminates but fails to close R. Then, the next time that the application runs, there are replicated copies of R running - this slows the system. One solution would be to kill any open versions of Rterm.exe each time

Colleagues, I want to create the following array: "A1", "A2", "A3", "B1", "B2", "B3", "C1", "C2", "C3" I recall that there is a trick using "c" or "paste" permitting me to form all combinations of c("A", "B", "C") and 1:3. But, I can't recall the

Colleagues, Hopefully a simple problem: I want to delete a column with a known name from a dataframe. I could write: FRAME <- FRAME[, names(FRAME) != NAMETODELETE] or FRAME <- FRAME[, !names(FRAME) %in% c(NAME1, NAME2, ETC)] Is there some simpler means to accomplish this? Dennis Dennis Fisher MD P < (The "P Less Than" Company) Phone: 1-866-PLessThan (1-866-753-7784)

Colleagues, I am interesting in opening a PDF document via the command line from both Windows, OS X, and Linux ( R version 2.8.0). I found a command openPDF in Biobase. However, I would rather execute the command myself. For example, in OS X: > system("open filename.pdf") is successful. Is there a comparable command line command for Windows or Linux? Dennis Dennis Fisher

Colleagues R: 2.12.2 OS X I have a set of text objects in the form (I am showing 3 of what is more likely to be 20 or so): OBJECTS <- c("abcSOMETHINGCOMMONegf", "xSOMETHINGCOMMONyz", "SOMETHINGCOMMONnme") As you can see, all contain "SOMETHINGCOMMON" and the position varies. But, I don't know what that "SOMETHINGCOMMON" is. Is there an

Colleagues After reading in some clinical data, I discovered that the subject ID column contains entries only for the first record for each individual; subsequent rows are recorded as NA. For example: > 1 > NA > NA > NA > NA > 2 > NA > NA > NA > NA > 3 > NA > NA > ... I can think of various approaches to replace the NA values with appropriate

Colleagues, (Running R 2.7.0) I have a script that I want to delete as it completes execution. The penultimate line of the script (before the quit command) is: file.remove("Scriptname") The script is executed as: R --no-save < Scriptname In OS X and Linux this is successful and returns: > > file.remove("x") > [1] TRUE and the file is deleted In Windows XP,

Colleagues, I have some text: TEXT <- c("a", "bb;ccc", "dddd;eeeee;ffffff") I want to retrieve the portion of each element before the first semicolon. I can split each element using strsplit: SPLIT <- strsplit(TEXT, ";") This yields: > SPLIT [[1]] [1] "a" [[2]] [1] "bb" "ccc" [[3]] [1] "dddd"

I have data in the following format: > DATE [1] "01/13/2004" In order to find the difference between two data points, I presently use brute force to calculate the day of the year: > strptime(DATE, format="%m/%d/%Y")$yday [1] 12 Although this works, it may not be robust over different years. I assume that R is sufficiently clever that a much simpler approach

I run R 2.1.1 in a Linux environment (RedHat 9) although my question is not platform-specific. Consider the following: > A <- c("Prefix-aaa", "Prefix-bbb", "Prefix-ccc") > B <- strsplit(A, "-") > B [[1]] [1] "Prefix" "aaa" [[2]] [1] "Prefix" "bbb" [[3]] [1] "Prefix" "ccc" How

Colleagues, I have encountered behavior of random number generation that eludes me. I generate a random integer in a particular range using the following code: sample(1000:9999, size=1) This code exists within a script that starts with the command: remove(list=ls()) Each time that I run the script, it yields the same random number: 6420. I thought that the problem might result from

Colleagues, I have encountered a problem in version 2.9 of R, running in both Vista and OS X. My code is quite lengthy but the critical line is: if (file.exists(FILENAME)) readLines(FILENAME)) This triggers the error: Error in file(con, "r") : cannot open the connection Calls: readLines -> file Execution halted The file that it is reading is being created on the fly, then

Colleagues I frequently insert PDF graphics created with R into Word (Office 2004 for Mac) documents. The documents are created on either a Linux machine (RedHat 9) or a Mac (Tiger). I am using R 2.2.0. These pdf graphics often lose a great deal of resolution after insertion into Word compared to their high quality when printed as PDF documents. I recently learned that converting the

Colleagues, Please forgive my ignorance of this topic. I am experienced with the installation/use of R in OSX and Windows, much less so with Linux. I just created a virtual machine of Ubuntu 9.0.4. Using the Synaptic Package Manager, I installed R 2.8.1. I would like to obtain 2.9.x and I am having trouble doing so using the tools available within Ubuntu. I tried apt-get install

Colleagues, I am using R 2.7.2 on all three platforms (OS X; Windows; Linux) and I have encountered the following problem: I use R to issue a system call the execute a command in the OS. For example: system("DOSOMETHING TOSOMEFILE") In most situations, this task completes successfully and control returns to R. However, in rare situations, the target file (TOSOMEFILE) is

Colleagues R 2.8.0; OS X, Vista, Ubuntu Linux In some instances, when I create a graphic using plot(XVAR, YVAR), it would be valuable to know the values that R will display on the y-axis (e.g., if the range of data is 0-70, it might display 0, 10, 30, 50, 70). Is there a simple means to access these values? Also, in some instances, additional ticks appear between the displayed values

Colleagues: I have encountered the following situation: SERIES OF COMMANDS source("File1") MORE COMMANDS source("File2") Optimally, I would like File1 and File2 to be merged into a single file (FileMerged). However, if I wrote the following: SERIES OF COMMANDS source("FileMerged") MORE COMMANDS I encounter an error: the File2 portion of FileMerged

Colleagues, R version 2.8.1 in OS X Within a function (which is already within a function), I am sourcing a file. The syntax of the command is something like (this is just an example; the actual code is much more complicated): BIGFUNCTION <- function() { DATAFRAME <- [some commands to create a dataframe] MYFUNCTION(DATAFRAME) } MYFUNCTION <- function(DATAFRAME) { print(ls())

Colleagues, I am preparing scripts that will be used by others on both Windows and Linux/OSX platforms. The scripts call an existing Fortran application. The user may have any of a a variety of Fortran compilers - my goal is to determine whether or not the test command returns "no input files" or "command not found" (i.e., so that I can confirm which Fortran they

Colleagues, I have created a list in the following manner: TEST <- list(c("A1", "A2"), c("B1", "B2"), c("C1", "C2")) I now want to delete one element from the list, e.g., the third. The command TEST[[3]] yields (as expected): [1] "C1" "C2" The command TEST[[-3]] yields: Error: