similar to: identifying what labels have been created in a plot

Colleagues, I am fitting an Emax model using nls. The code is: START <- list(EMAX=INITEMAX, EFFECT=INITEFFECT, C50=INITC50) CONTROL <- list(maxiter=1000, warnOnly=T) #FORMULA <- as.formula(YVAR ~ EMAX - EFFECT * XVAR^GAMMA / (XVAR^GAMMA + C50^GAMMA)) ## alternate version of formula FORMULA <- as.formula(YVAR ~ EMAX - EFFECT / (1 + (C50/XVAR)^GAMMA)) FIT <-

Colleagues R 2.10.1 on a Mac I read in textfiles using readLines, then I process those files, then I use R to execute another program. Occasionally those files contain characters other than letter / numbers / routine punctuation marks. For example, a bullet (option-8 on a Mac) triggers the problem. Although R can read and process those characters, the other program cannot so I would like to

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:

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 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, 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"

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: 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

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 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, 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 submitted this several days ago and no one responded, so I am trying again, trying a different subject line: I just encountered some unexpected behavior of difftime in relationship to the change from daylight savings to standard time. My understanding is that DST and ST take effect at 2AM. However, the results below suggests that R (version 2.8.0 in OS X) implements the

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

Hi there, Could someone help me with the following programming problem..? I have written a function that works for my intended purpose, but it is quite closely tied to a particular dataframe and the names of the variables in this dataframe. However, I'd like to use the same function for different dataframes and variables. My problem is that I'm not quite sure how to tell my function in

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, I am using R (2.9.2, all platforms) to search for a complicated text string using regular expressions. I would appreciate any help you can provide. The string consists of the following elements: SOMEWORDWITHNOSPACES any number of spaces and/or tabs ( any number of spaces and/or tabs integer any number of spaces and/or tabs ) Examples include: WORD ( 123 ) WORD(1 )

Colleagues I have just encountered an interesting problem with readLines in R 2.7.0 in Windows Vista. I am trying to read a line that is created in the following manner: 1. Intel Fortran (ifort) 10.1 creates two text files. 2. The OS concatenates these files with: copy FILE1 +FILE2 FILE3 From R, I execute: readLines("FILE3") Only the first portion of the file (the original

R 2.12.2 Windows 7 Colleagues, I just took advantage of the function: readWindowsShortcut in R.utils. It accomplished my goals and I was interested in learning its inner workings. So, I typed the function at the command line (without arguments or parentheses). R returned: function (...) UseMethod("readWindowsShortcut") <environment: namespace:R.utils> providing no

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, Platform: OS X (but issue applies to all platforms) Version: 2.8.0 I have a mixture of text and data that I am outputting via R to a pdf document (using a fixed-width font). The text contains tabs that align columns properly with a fixed-width font in a terminal window. However, when the PDF document is created, the concept of a tab is not invoked properly and columns do