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Dear all, I would like to us openBLAS in R under Linux / Unix. Which steps do I have to undertake? Does someone know a detailed description? (I found some sources on the web, but none was really helpful for me...

Dear R users, I have a dataframe which consists of variables of type numeric and factor. What is the easiest way to split up the dataframe to two dataframe which contain all variables of the type numeric resp. factors? Thank...

Dear all, when applying the optim function the following error occured "non-finite finite-difference value" Therefore I would like to ask how one can try to handle such a problem and which strategies have proven useful. (There is only...

Dear all, I would like to ask, if there is a way to make the variance / dispersion parameter $\theta$ (referring to MASS, 4th edition, p. 206) in the function glm.nb dependent on the data, e.g. $1/ \theta = exp...

Dear all, ? the following example somehow uses the "old data" (X) to make the predictions, but not the new data Xnew as intended. ? y <- rnorm(100) X <- matrix(rnorm(100*10), ncol=10) lm <- lm(y~X) Xnew <- matrix(rnorm...

Dear all, when I am running the code attached below, it seems that no results are returned, only the predefined NAs. What mistake do I make? Any comments and help is highly appreciated. Thanks and best, Martin Simpar3 <- function(n1...

Dear all, I have the following problem: add <- function(x,y) {x+y} What is the easiest / most elegant way to create a new function (e.g. with the name "addev") that sets the second argument of the function "add...

Dear all, I am looking for a function in R which returns all possible permutations of an object x with r number of repitions. For example If x <- c(0,1) and r <-3 the result should be 0 0...

Dear all, I would like to convert the first column of a dataframe to a date (original format: year (4 digits) and month (last 2 digits)) >str(dat_FF) 'data.frame': 1022 obs. of 4 variables: $ date : int 192607 192608...

Dear all, I have a dataframe of the following strucutre numacc_b coverage_b Geschlecht GG 1 0 1 W A 2 0 1 M A 3 0 1 M B 4 0 1 M B 5 0 1 W...

Dear all, I am working with glmnet but the problem arises also in all other Lasso implementations: It is ususally recommended to standardize the variables / use intercept and this works well with the implemented options: x <- matrix(rnorm(10000), ncol...

Dear all, I am trying to parallelize the function npnewpar given below. When I am comparing an application of "apply" with "parApply" the parallelized version seems to be much slower (cf output below). Therefore I would like to ask how...

Hey Michael, Thank you very much. It works! Best, Martin -------- Original-Nachricht -------- > Datum: Fri, 10 Dec 2010 22:35:56 +1100 > Von: Michael Bedward <michael.bedward at gmail.com> > An: Martin Spindler <Martin.Spindler at gmx.de> > CC: r-help...

Dear all, I am trying to use Rcpp to write some files in C++ for use in R. Below is an example for a cpp-file (crossp.cpp). Then I use >sourceCpp("crossp.cpp") in R and the corresponding function...

Thank you very much for your help. ? I tried it under Unix and then the parallel version was faster than under Windows (but still slower than the non parall version). This is an important point to keep in mind. Thanks...

Dear Jim, Thank you very much for your response. It seems to work now, but the return value is not the required matrix but a list of matrices (one for each repition j). Any idea how it is possible to...