similar to: R & very large files

Hi,   I'm reading up on S4 classes *). There seem to be at least two ways of input validation: setClass() (using the 'validity' argument)  and setValidity(). Is it a matter of taste which function is used? Or should more complex validation code better be put in a setValiditity call? *) A (Not So) Short Introduction to S4 Object Oriented Programming in R V0.5.1 Christophe Genolini

Hi,   I would like to make a program that reads excel files, and writes the cells of which contents is not a formula to another file. I don't think this is possible with RODBC, but it may be possible with rcom.     I read the documentation of the rcom package, but I was hoping somebody knows a good web resource for more eleborate info. I tried Googling, but alas (did you know rcom also is a

Hi, I am new to R so forgive me if the following query is somewhat simple.  I have a small tab-separated file with n records of glucose values, one record per day, seven measurements per day. It looks like this: date    sober    no    vm    nm    va    na    vs 20091229    NA    6.8    NA    2.7    11.7    2.7    6.2 I'd like to make a graph on which the glucose day curves are plotted

Hi, I've just been browsing for IDEs for R, see e.g. http://www.linuxlinks.com/article/20080413133953606/R.html It's probably highly subjective, but which free IDE is the best one around? For the Python language, I've always been using IDLE. I like the syntax highlighting and the syntax suggestions the user gets while typing a function name. Ideally, the IDE should run on any

Hi all, I have a (hopefully) simple newbie-level question.   # I have data like this: dtf <- data.frame(read.table(textConnection("var  value   company  9887.1   company  91117.0   blaah  91.1   etc  11   etc  97111"), header=TRUE))   # I would like to have output like this (the index number may vary): var  value.1 value.2 company 9887.1 91117.0 blah  91.1 NA etc 11 97111   # I

Hi   I'm using R v2.8 under Windows*) and I'm trying to install a new package (local zip file), but I get the message below. I followed some advice at http://cran.r-project.org/bin/windows/base/rw-FAQ.html (4.2 onwards), but to no avail. How can I tell R to save the help files to an alternative location? I don't have write access to the default location.   >

>>> What were your biggest misconceptions or >>> stumbling blocks to getting up and running >>> with R? Easy. I terms of materials I have been unable to find good books that introduce users to R from the perspective of someone familiar only with packages like SPSS or STATA, or not familiar with statistics packages at all. Even introduction texts use jargon

Hi R lovers, I'm looking for more information about, and implementations of abstract classes. After reading "Head First Design Patterns" (O'Reilly). I want to know whether I could use this to build an interface, i.e. a placeholder for all possible methods in the underlying subclasses. The final goal is to end up with a more flexible/extensible design than could be achieved with

I imported the attached tiff file and converted the coordinate system to long lat and graphed it: californiatiff<- readGDAL("california1.tif") proj4string(californiatiff) > rasterprojection <- spTransform(californiatiff, CRS("+proj=longlat") however, when using the plot command for rasterprojection, I get a blob. I can see the outline of the state of california and

Hi, I want to recode all Inf and NaN values to NA, but I;m surprised to see the result of the following code. Could anybody enlighten me about this? > df <- data.frame(a=c(NA, NaN, Inf, 1:3)) > df[is.infinite(df) | is.nan(df)] <- NA > df a 1 NA 2 NaN 3 Inf 4 1 5 2 6 3 > Thanks! Cheers!! Albert-Jan

Hi, I want to recode all Inf and NaN values to NA, but I;m surprised to see the result of the following code. Could anybody enlighten me about this? > df <- data.frame(a=c(NA, NaN, Inf, 1:3)) > df[is.infinite(df) | is.nan(df)] <- NA > df a 1 NA 2 NaN 3 Inf 4 1 5 2 6 3 > Thanks! Cheers!! Albert-Jan

Hi,   I am making a mock user interface in tcltk and I would like to add a 'check menu button' such as shown here: http://zetcode.com/tutorials/pygtktutorial/images/checkmenuitem.png   Does anybody know how to do this? I am quite new to R. Cheers!! Albert-Jan ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ All right, but apart from the sanitation, the medicine,

Hi,   I'm reading 100s of excel files and many of them contain links to external files (I hate that, but that aside). Every time such a file is opened, a menu pops up asking if I want to update the links. I never want to update the links. I used the macro recorder to see what code would be needed to suppress that message, but to no avail (I tried more variations, but one attempt is shown

Hello, A simple question perhaps, but how do I, within each row, find the first occurence of the number 1 in the df below? I want to use this position to programmatically create the variable 'year'. I'v come up with a solution, but I find it downright ugly. Is there a simpler way? I was hoping for a useful built-in function that I don;t yet know about. df <-

Hi,   I'm new to R and S4 classes. I defined a class with two methods (myMethod1 and myMethod2). I want to call myMethod1 within myMethod2. Why does the code below not work? The name 'myMethod1' doesn't appear to have meaning inside myMethod2, even though the two methods belong to the same class.     setClass(Class="SomeClass",      representation=representation(      

Hi,   Is there a built in function that returns a character vector of all subclasses of a given superclass? showClass(Class = "SomeClass") contains the info that I want, but I don't know how to access it. getSubClasses <- function(superClass) return(setdiff(getClasses(.GlobalEnv), superClass)) wíll only work if the global enviroment isn;t filled with other class definitions.

Hi, I'm using reshape to cast molten data. When I use the following command, R either crashes (when I use Notepad++) or gives an error (when I use Rgui or source()), BUT the error occurs not always, maybe only on half the attempts: w <- cast(v, id + code + productname + year + begin + end + specificDesc + specificDesc2 ~ type) Error in merge.data.frame(data, all.combinations, by =

Hello, How can I tell RODBC to scan all the records of an xls file to determine the data type? If the first n records happen to be empty Rodbc assumes a character, and any numbers are made <NA>. And if, for instance, the first n records contain numbers, and later they also contain characters, those characters become NA. Cheers!! Albert-Jan

Hi,   I would like to recursively loop through al subfolders of a directory and do stuff with certain file types in those dirs. Is there a package/function that could do this? So it's more than Sys.glob. I'm looking for equivalent of Python's os.walk *) and I don't want to reinvent the wheel.   Thank you. Cheers!! Albert-Jan   *)

Hi,   If I use sprintf and return inside a function, sprintf doesn't print anything anymore. See the non-sense example below.   > x <- function() { a <- 888 + sprintf("xxx %s", a) } > x() [1] "xxx 888" > x <- function() { a <- 888 + sprintf("xxx %s", a) + return(a) } > x() [1] 888 Is this a bug? Cheers!! Albert-Jan