rjava

问题 I wish to load rJava in R x64 3.1.2. OS- Windows 8.1 64 bit Though installation seems to work fine: > install.packages("rJava") Installing package into ‘C:/Users/sony/Documents/R/win-library/3.1’ (as ‘lib’ is unspecified) --- Please select a CRAN mirror for use in this session --- trying URL 'http://cran.utstat.utoronto.ca/bin/windows/contrib/3.1/rJava_0.9-6.zip' Content type 'application/zip' length 758898 bytes (741 Kb) opened URL downloaded 741 Kb package ‘rJava’ successfully unpacked and

问题 I wish to load rJava in R x64 3.1.2. OS- Windows 8.1 64 bit Though installation seems to work fine: > install.packages("rJava") Installing package into ‘C:/Users/sony/Documents/R/win-library/3.1’ (as ‘lib’ is unspecified) --- Please select a CRAN mirror for use in this session --- trying URL 'http://cran.utstat.utoronto.ca/bin/windows/contrib/3.1/rJava_0.9-6.zip' Content type 'application/zip' length 758898 bytes (741 Kb) opened URL downloaded 741 Kb package ‘rJava’ successfully unpacked and

问题 I use rJava to call a java code from R, trying to call an algorithm from SPMF tool. I tried to use a wrapper function as in this question, but this did not work with the SPMF code. this is my R code: library(rJava) .jinit() .jaddClassPath ( "C:/mydrive/eclipse-workspace/myfile/src") print(.jclassPath()) obj <- .jnew("AlgoFPGrowth_Strings") s <- .jcall(obj, returnSig= "V", method="runAlgorithm", "input.csv","output.txt") , 0.4 ) it gives me error ,method runAlgorithm with signature (D)V not

问题 I am using R on AWS EC2 instance. I am trying to send a mail using the "mailR" package. I was told that to install the package I should previously install the package "rJava" as "mailR" depends on it. When trying to install "rJava" I get this error: gcc: error: libgomp.spec: No such file or directory After a quick search, I saw a post on this link explaining this: "You have to make sure your GCC has OpenMP support enabled. Make sure you select OpenMP from the optional packages when installing

问题 It seems that the last java version makes rJava not able to load or compile / install. Is there any way I can have java8 and java9 installed and force rJava or R use the java8 version? Edit: It's been suggested that perhaps this thread is the solution to my problem, but it isn't. Since I need to use a lower version, not the new one. Seems that it's possible to tell R where is the java_home, but I don't know how. 回答1: Take a look here: R, Java, rJava and macOS adventures and here: R 3.4, rJava

问题 i'm using JRI, to talk to R through Java. If i try to get the result of my R-Code as Double i get a NullPointer. Normally this is caused by an error of R. Is it possible to get the output of the R-Console into Java in order to read the error? 回答1: Ok. Here is what I did, to solve the problem. because my REngine is a singleton i was able to perform those R-Expressions, after the creation: re.eval("log<-file('"+filepath+"')"); re.eval("sink(log, append=TRUE)"); re.eval("sink(log, append=TRUE,

问题 I'm having this issue for a while now and can't find answers online. I try to execute makeCluster and somehow get this Error in .jfindClass(as.character(driverClass)[1]) : class not found library(doParallel) library(foreach) cores = makeCluster(2) # Loading required package: methods # Loading required package: DBI # Loading required package: rJava # Error in .jfindClass(as.character(driverClass)[1]) : class not found # Calls: JDBC -> is.jnull -> .jfindClass # Execution halted Would anyone be

问题 I am facing an issue with returning any type of array with .jcall() . Here is my code. public class Test(){ public static double[] sample(){ double[] nobjarr = new double[5] nobjarr[0] = 1.0; nobjarr[1] = 1.0; nobjarr[2] = 1.0; nobjarr[3] = 1.0; nobjarr[4] = 1.0; return nobjarr; } } In R, I am calling using .jcall library(rJava) .jinit() .jaddClassPath("path to .class file") objT <- .jnew("Test") res <- .jcall(objT,"[D","sample") For this I get an error saying "Error in .jcall(objT, "[D",

问题 Bear in mind that I am computer illiterate and new to R. I have installed the rJava package in R studio version 1.0.143 and installed Java 8 (using MacOS Sierra). When I try to load the rJava package: library(rJava) I get the following error Unable to find any JVMs matching version "(null)". No Java runtime present, try --request to install. Error: package or namespace load failed for ‘rJava’: .onLoad failed in loadNamespace() for 'rJava', details: call: dyn.load(file, DLLpath = DLLpath, ...)

问题 I installed the rJava package but it's showing the following issue while using the library library("rJava") Error: package or namespace load failed for 'rJava': .onLoad failed in loadNamespace() for 'rJava', details: call: dyn.load(file, DLLpath = DLLpath, ...) error: unable to load shared object '/Library/Frameworks/R.framework/Versions/3.4/Resources/library/rJava/libs/rJava.so': dlopen(/Library/Frameworks/R.framework/Versions/3.4/Resources/library/rJava/libs/rJava.so, 6): Library not loaded