similar to: for loop over S4

I am out of my league with this question. The following code starts the java imaging program ImageJ from within R, and displays an image (assuming ImageJ is installed on your computer). library(RImageJ) img <- IJ$openImage( file.choose() ) #pick an available .tif file img$show() # make the image object visible # An image is now displayed # find out about the objects involved >

Hello, I'm trying to package some source files that link R to a broker using a Java API and the rJava package. I am successful doing the connection and operate on it using my R code. I would like to package the files and release the package. I created some S4 classes to hold several Java objects. I use WinXP and R 2.7.1. I've searched RSeek and the Wiki for help, but could not find a

I'm trying to understand the R internals a bit better and reading over the documentation. I see that there is a bit related to whether an object is S4 (S4_OBJECT_MASK), and also the object type S4SXP (25). The documentation makes clear that these two things aren't the same. But in practice, will the S4-bit and object type ever disagree for S4 objects? I know that one can set the bit

Hi all I had written a gdb macro to dump the string representation of an SEXPREC type when I realised everything I needed was in inspect.c already in the typename() function. However, the typename function doesnt handle the RAWSXP type, so if possible, could the following patch be applied (I've just put in inline as it is a trivial 1-liner)? Index: src/main/inspect.c

Hola. En mi caso, no he podido resolver los problemas con el Java para usar XLConnect, que en los papeles me parece el mejor. Supongo que algo de la arquitectura del sistema o bien de la relación entre el Java, el R y el RStudio. Así que utilizo library(openxlsx) write.xlsx(datos, file = "EDA1.xlsx") #donde datos es el objeto que quiero guardar. Requiere instalar el RTools, según tipo y

Dear all, I have some troubles using the stemming algorithm provided by the tm (text mining) + Snowball packages. Here is my config: MacOS 10.5 R 2.12.0 / R 2.13.1 / R 2.14.1 (I have tried several versions) I have installed all the needed packages (tm, rJava, rWeka, Snowball) + dependencies. I have desactivated AWT (like written in

Dear List, Java Exception error while reading large data in R from DB using RJDBC. I am trying to read large data from DB table(Vectorwise), using RJDBC connection. I have tested the connection with small size data and was able to fetch DB tables using same connection(conn as in my code). Please suggest where am i going wrong or alternate option to solve such issues while reading large DB

Buenos días a todos! Estoy trabajando con una base de datos que directamente he descargado de internet y después de prepararla un poco necesito exportarla a Excel he intentando con las dos opciones que mencionaré al final pero ninguna funciona, de qué otra manera puedo exportar esos datos a Excel... muchas gracias por su ayuda y pronta respuesta! 1) library(xlsx) library(rJava)

Dear all, I am facing a problem with running a script that i have written in R and i hope you can help me spot which exactly is the problem and how i can solve it. The error I get is the following: ---- Error in .jcheck(silent = FALSE) : Java Exception <no description because toString() failed>.jcall(row[[ir]], "Lorg/apache/poi/ss/usermodel/Cell;", "createCell",

Hello everybody, I'm running R under Mac OS 10.6.3 on a MacBook 2.16 GHz Intel Core 2 Duo. I've recently installed R 2.11.0 and the RImageJ library v. 0.1-142. When trying to follow the example given in the package manual and I get the following error: download.file( "http://www.google.fr/intl/en_en/images/logo.gif", dest = "google.gif" ) trying URL

Regarding, this news item for r-devel: ?for()? loops are generalized to iterate over any object with ?[[? and ?length()? methods. Thanks to Herv? Pag?s for the idea and the patch. Below dd is an object for which [[ and length work but the result is still numeric rather than Date class in "R Under development (unstable) (2016-03-15 r70334)" as observed in the comments to:

On May 12, 2008, at 6:49 PM, Talin wrote: > So the question is, what's the trade-off. In most languages that > support > exceptions, you tend to think of exceptions as expensive operations > that > should only be thrown if something truly "exceptional" happens. OTOH, > the Java case is also made worse by the fact that a large part of the > time you'll be

This is related to the general question of efficiency of unwinds. I'm mulling over whether to use the Java-style or Python-style iterator protocol for my language. The Python style is to have a special exception (StopIteration) that is thrown when the end of the sequence is reached. The Java style is to have a separate "hasNext" method on the iterator object that says whether or

Hi Travers, Just an additional remarks to Michael's answer, if your S4 class inherits from R's basic types, say integer, the resulting object will be an INTSXP. If your S4 class does not inherit from any class, it will be an S4SXP. You can think about this question from the object-oriented framework: If one class inherits the integer class, what should R do to make all the integer related

We noticed that the slot<- function alters its first argument, which goes against the grain of a functional language. The similar @<- does not change its first argument. Is this intended? The timeSeries and distr package depend on this altering. > setClass("Z", rep=representation(x="character")) > z <- new("Z", x="orig") > `@<-`(z,

Hello all, I am attempting to run an R script that makes use of RWeka. I am running SuSE Linux 9.3 with Java 1.5.0_06, R version 2.2.1, Weka 3-4-7, and Rweka 0.2-1. CLASSPATH="/usr/local/weka-3-4-7/weka.jar:/usr/local/JGR/JGR.jar" I receive the error: NewObject("weka/core/Instances","(Ljava/io/Reader;)V",...) failed Exception in thread "main"

Hi. This post follows on from: http://lists.xensource.com/archives/html/xen-devel/2005-04/msg00185.html And is possibly related to the bug referenced here: http://bugs.sun.com/bugdatabase/view_bug.do;:YfiG?bug_id=4335360 In summary: Java processes are doing odd things. 1) It appears that number values are mysteriously changing. e.g. if you look at the Hashtable error there is no way the

Hi, I have a problem installing SystemVision from MentorGraphics in wine. The problem is with the packaged Java Runtime 1.3.1. The error output when installing is: Exception in thread "main" java.lang.ExceptionInInitializerError: java.lang.RuntimeException: Unable to create a suitable default GraphicsConfiguration. Try changing your Display Settings. at

I put the disc in and run the setup.exe it says "InstallAnywhere is preparing to install" then it quickly goes from 0% to 100%... then it disappears and nothing happens... Please help... I've got to learn Japanese... :(

Trying to access R from Netlogo5 (using the NetLogo R-Extension), running the configuration validation tests in NetLogo5/extensions/r/Systemcheck.nlogo, I get several loadlibrary() errors ... in rJava Check2, > library(rJava); .path.package('rJava') Error : .onLoad failed in loadNamespace() for 'rJava', details: call: inDL(x, as.logical(local), as.logical(now), ...)