similar to: setting options only inside functions

Dear list, this might be an easy one, but I could figure out a solution (or how to google the right term). Is there any way to test whether all elements of a vector are identical? For numeric vectors I would use sum(diff(vector)==0)==0 but I have character vectors. Any Ideas? Cheers Jannis

Dear list members, I frequently program small scripts and wrap them into functions to be able to check them with checkUsage. In case these functions (loaded via source or copy pasted to the R console) use functions from other packages, I get this error: no visible global function definition for ?xxxxxxx? For example: test = function() { require(plotrix) color.legend() }

Dear list, is there a function in R that returns the product of a vector? E.g. if the vector is c(1,2,3,4) it should return 1*2*3*4=24 Cheers Jannis

Dear list memebers, I am stuck with using regular expressions. Imagine I have a vector of character strings like: test <- c('filename_1_def.pdf', 'filename_2_abc.pdf') How could I use regexpressions to extract only the 'def'/'abc' parts of these strings? Some try from my side yielded no results: testresults <-

Hey R folks, i found some strange (to me) behaviour with chron to POSIXct conversion. The two lines of code result in two different results, on ewith the correct time zone, one without: library(chron) as.POSIXct(chron('12/12/2000'), tz = 'UTC') as.POSIXlt(chron('12/12/2000'), tz = 'UTC') Only the code below would give me a POSIXct object with the correct time

Dear R community, I have a general question regarding indexing in multidiemensional arrays. Imagine I have a three dimensional array and I only want to extract on vector along a single dimension from it: data <- array(rnorm(64),dim=c(4,4,4)) result <- data[1,1,] If I want to extract more than one of these vectors, it would now really help me to supply a logical matrix of the

Dear list members, does anyone have an idea why the following construction does not work but gives the following error message: assign('test', array(1:10, dim=c(10,10))) dimnames(get('test')) <- list(1:10,1:10) Error in dimnames(get("test")) <- list(1:10, 1:10) : target of assignment expands to non-language object What could be a way to get this to work?

Dear list, I am trying to understand and use the ff package. As I had some problems saving some ff objects, and as I did not fully manage to understand the whole concept of *.ff, *.ffData and *.RData with the help of the documentation, I tried to reproduce the examples from the help of ffsave. When I ran, however : (copied from the help) message("let's create some ff objects")

Dears, a way to define x and y positions in plots in relative numbers (e.g in fractions between 0 and 1 referring to relative positions inside the plot region) would really help me. One example I would need this to would be to add text via text() to a plot always at a defined spot, e.g the upper left corner. Until now I always determined maximum x and y values and used those, but defining

Dear all, I would like to ask one question related to statistics, for specifically on defining dummy variables. As of now, I have come across 3 different kind of dummy variables (assuming I am working with Seasonal dummy, and number of season is 4): > dummy1 <- diag(4) > for(i in 1:3) dummy1 <- rbind(dummy1, diag(4)) > dummy1 <- dummy1[,-4] > > dummy2 <- dummy1 >

Dear List, does anybody has experience with the RNetCDF package? I manage to open a connection and copy data from a ncdf file but would need a way to automatically retrieve variable names (ideally all of them from one file) and units from the file. Any ideas? Jannis

Dear R developers, as far as I understand the manual of list.files(), there is only a way to exclude directories from the returned vector if you use list.files recursively. In non recursive mode, there seems to be no way of excluding directories (the include dirs argument does not seem to have any effect). Would it not be more intuitive and practical to allow the switching off of directory

Dear R users, i am trying to get the line number of the code where an error is produced. With the options: options(keep.source = TRUE, show.error.locations = TRUE, keep.source.pkgs = TRUE) I have managed to get the error locations to show up when i source the respective files. They do not, however, show up for the same errors when I use installed packages. Do I have to build these packages

Dear List, i would like to mimic the behaviour or the following indexing with a do.call construct to be able to supply the arguments to `[` as a list: test = matrix[1:4,2] result = test[2,] My try, however, did not work: result = do.call(`[`,list(test,2,NULL)) result = do.call(`[`,list(test,2,)) result = do.call(`[`,list(test,2,'')) How can I use the do.call in that way with

Dear R developers, i have already send the question below to r-help but got no responses. Perhaps it is more suitable for r-devel due to its rather technical level. It would really help me to find a solution (or to find out that there is none). Is there any way to access/print/save the content of an environment in which an error occoured? Imagine the following testcase: test =

Dears, is there any way to "switch off" or work around the error message that pops up when I do something like: A<-B['logical vector'] and when 'logical vector' only consists of FALSE values? My problem is that this message always kicks me out of my loops and always testing via an if clause whether 'logical vector' contains any TRUE values is much too

Dears, I am trying to implement some R package which is still under construction and has not yet been submitted to CRAN (RSSA, http://anton.korobeynikov.info/software). Documentation is yet very poor (or i just did not find it), so I am wondering whether there is any way to retrieve a list of commands available in this package from within R? And to find out whether the package is successfully

Dear R users, I am using dump.frames() to investigate the content of the different environments in cases of errors or during certain steps of a non interactive calculation. I am, however, wondering about how to see the content of the global environment at the moment that dump.fames() was invoked. Her is some test piece (careful about the rm(list=ls(), remove the # if you know what you are doing

Dear List, i run R non interactively and use option(error = dump.frames) to reconstruct the cause of errors for debugging. One of the functions in the call stack however uses the "..." (dot dot dot) argument. When I run debugger() and try to browse to this functions' environment I get the following error message: Error in get(.obj, envir = dump[[.selection]]) : argument

Dear R help community, I have tumbleled across some problem quite often and could not find a solution for it (or was not able to google the right terms). I am wondering whether there is a way to tell R to assign a value of parameter X to parameter B while the actual name of parameter X is given by parameter C. Like this: C<-"name of parameter X" B<- parameter X which has the