similar to: Intermittent connectivity issues for JDBC / Oracle

I am desperate for help. I am trying to get the RJDBC and rJava .5to work on both my windows xp and linux Redhat EL5 Server. On both I get a ava.lang.ClassNotFoundException when calling JDBC(). My example is require(RJDBC) classPath='C:\\libraries\\mysql-connector-java-5.1.3-rc\\mysql-connector-java-5.1.3-rc-bin.jar' driverClass=c("com.mysql.jdbc.Driver") drv <-

Dear All, I'd like to use Weka functions that are not implemented (do not have interface) in RWeka, like the Remove function and others in the future! The .java() functionality is for that purpose but I haven't seen any example with Weka functions. Could anyone give me hand in how to do it? For instace if I want to use the weka.filters.unsupervised.attribute.Remove? 1. in the R console,

Dear Rxperts, Through Windows OS, I created shortcuts (paste as shortcut) to excel spreadsheets ( with "xlsx" as the file extension). I wasn't able to read the shortcuts through R and using "read" functions of "xlsx" package. exf <- "a1.xlsx.lnk" > read.xlsx(exf,1) Error in .jcall("RJavaTools", "Ljava/lang/Object;",

Hi, I am facing trouble when trying to read large xlsx file into R. please find the code and error below. The file I was trying to read has 36,500 rows X 188 col, ~ 37 MB size. > options( java.parameters = "-Xmx4g" ) > library(xlsx) Loading required package: xlsxjars Loading required package: rJava > cftc =

Dear R People: I have been experimenting with rPython, rSymPy, and rJython. Here is my latest snag: > library(rJython) Loading required package: rJava Loading required package: rjson > library(rSymPy) > rJython <- rJython() > x <- "x" > y <- "y" > rJython$exec("from sympy import *") Error in .jcall("RJavaTools",

Buenos días, Me gustaría compartir una duda con la que me acabo de encontrar y no se como solucionar, por si podrías echarme una mano: Trabajo con bases de datos en R que importo de excel. Cargando las librerías de: rJava , xlsxjars y xlsx. Al principio no parecía haber ningún inconveniente, pero después de un tiempo de trabajo me aparece el siguiente error en la consola de datos: *Error in

Dear all, I get the error when I use maxent.jar: Error .jcall(mxe, "S", "fit", c("autorun", "-e", afn, "-o", dirout, : java.lang.NoSuchMethodError: density.Params.readFromArgs([Ljava/lang/String;)Ljava/lang/String; sessionInfo() result: R version 2.14.0 (2011-10-31)Platform: i386-pc-mingw32/i386 (32-bit)locale:[1]

I think remember this error from trying to write an Excel file that already existed. If this file already exists, try to delete it and see, if this solves the issue. Besides that you're writing that you are "Using write.xlsx to extract data from an Excel file", write.xlsx() is to write an Excel file, not to read from it. Should be read.xlsx() then iirc. ? ? Gesendet:?Freitag, 15.

Hello, I seem to have issues with setting the driver: My code: library(RJDBC) getStatic <- function() { # set driver driverClass <- JDBC("com.ibm.db2.jcc.DB2Driver","someClassPath.jar","'") conn <- dbConnect(driverClass,"serverName") etc etc } I get this error > data <-getData()

I am new to Ruby/RoR and would appreciate any help on the issue I am trying to resolve far past 2 days. I have a java application as a jar and I have included in the controller as below. require ''java'' require ''C:/Documents and Settings/user/Desktop/application.jar'' include_package ''whatever.something'' After that I am calling a method

I am trying to read an xlsx spreadsheet (1506 rows, 501columns) all populated but getting the following error: Please advise as to how to get around this issue. > res <- read.xlsx("c:\\BSE_v2.xlsx",1) Error in .jcall("RJavaTools", "Ljava/lang/Object;", "invokeMethod", cl, : java.lang.OutOfMemoryError: Java heap space Here is the session info:

Dear list, I'm running windows xp with R 2.12.0. I'm trying to load a excel spreadsheet into R using the xlsx package. I posted my code below with the error I get. > res <- read.xlsx("Copy of test_excel_input_data.xlsx", 6) Error in .jcall("RJavaTools", "Ljava/lang/Object;", "invokeMethod", cl, : java.lang.IllegalStateException: Cannot get

I?ve got an Excel workbook with about 30 worksheets. Each worksheet has 10000 rows of data over 30 columns. I?d like to read the data from each worksheet into a dataframe or matrix in R for processing. Normally, I use read.csv when interacting with Excel but I?d rather manipulate a multisheet workbook directly than set about splitting the original workbook and saving down each part as a csv.

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

Bare test code: My simple Java test class source and R test code follow: public class RJavTest { public static void main(String[]args) { RJavTest rJavTest=new RJavTest(); } public final static String conStg="testString"; public final static double con0dbl=10000001; public final static double[]con1Arr=new double[] { 10001,10002,10003,10004,10005,10006 }; public final static

Estimada Lorena Creo que lo comentado por Miguel y su interpretación de memoria son correctos, pero me permito una prueba, desde Rcmdr hay una opción para importar datos de Excel, esa alternativa ¿también falla?. Me refiero a intentar abrir un archivo con los datos que necesita, por las dudas en que aparezca algún mensaje distinto, que no creo, pero son solo 10 segundos de prueba. ¿Puede

Hello, Consider this : > setClass("track", representation(x="numeric", y="numeric")) [1] "track" > o <- new( "track", x = 1, y = 2 ) > for( i in o ){ + cat( "hello\n") + } Error: invalid type/length (S4/1) in vector allocation This happens at those lines of do_for: n = LENGTH(val); PROTECT_WITH_INDEX(v =

I am experimenting with rSymPy, and it seems to work nice. However, I dislike the need to wrap all sympy expressions within quotes, it leads to ugly calls like library(rSymPy) Var("x,y,z") sympy("(x+y)**2") and so on. Inspired by the function cq from mvbutiles package: library(mvbutils) > cq function (...) { as.character(sapply(as.list(match.call(expand.dots =

Hi list, I'm wanting to use a matrix as input to some java code, but I seem to be unable to do this (See code below). When searching online for a solution I found that rJava 0.5-2 (the version under development not yet in CRAN) is adding "direct support for raw vectors as method parameters". Is this related? I also tried to use .jarray / .jcast in various combinations to no avail.

After some trial and error I figured out how to pass matrices from R to java and back using rJava, but this method is not documented and I wonder if there is a better way? Anyway, here is what I found works: (m = matrix(as.double(1:12),3,4)) [shows m as you would expect] jtest <- .jnew("JTest") (v <- .jcall(jtest, '[[D], 'myfunc', .jarray(m), evalArray=FALSE)) [shows