search for: jcall

...urn(con2Arr); } } library(rJava) .jinit() .jaddClassPath("C:/ad/j") # a directory on my disk print(.jclassPath()) rJavaTst <- .jnew("RJavTest") # compilation of class code connStg <- .jfield(rJavaTst,sig="S","conStg") print(connStg) connStgRet <- .jcall(rJavaTst,returnSig="S","retConStg") print(connStgRet) conn1Arr <- .jfield(rJavaTst,sig="[D","con1Arr") print(conn1Arr) print(conn1Arr[2]) conn1ArrRet <- .jcall(rJavaTst,returnSig="[D","retCon1Arr") print(conn1ArrRet) print(conn1ArrRe...

...d made a small test script: #!/usr/bin/Rscript --no-restore --no-save --no-init-file library("RJDBC") drv<-JDBC("oracle.jdbc.OracleDriver","/home/oracle/lib/ojdbc6.jar", "'") dbCheck = function(url, user='', pwd='') { j = .jcall("java/sql/DriverManager", "Ljava/sql/Connection;", "getConnection", url, user, pwd, check=FALSE) x = .jgetEx() .jcheck() x } dbCheck("jdbc:oracle:thin:@192.168.3.10:1521:psrndpt1","myuser","mypass") When I run the file...

I haven't had time to try using R for over a year, but have a colleage who wants to. We work with time series and our current version of our calendar-time subroutines in java converts both directions between linear time and calendar. We have used calendar time since year 1965 starting out then with Fortran. Calendar time can be CnYrMoDa | CnYrMoDaHr | CnYrMoDaHrMn | CnYrMoDaHrMnSc |

...to use the weka.filters.unsupervised.attribute.Remove? 1. in the R console, first I load a matrix file, > matrix <- read.table(fileName, header=TRUE) OK! 2. Second, I f I want to remove the first attribute with Weka: > library(grid) > library(rJava) > library(RWeka) > c <- .jcall("weka/filters/unsupervised/attribute/Remove","S","Remove","-R","1",matrix) Is it that right? I get this message error! method Remove with signature (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String; not found I've pla...

...rror 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 v = m + 10] Here the JTest class has a method named myfunc that accepts a double[][] and returns a double[][]. It simply adds 10 to every element. The parameter 'evalArray' is confusing because when evalArray=TRUE th...

Hello I am trying to import the attached file Curva LIBOR to R. I am trying to use the following commands and obtaining the following errors > res <- read.xlsx("C:\\Users\\FELIPE PARRA\\Documents\\Quantil\\Federacion\\Curva LIBOR.xlsx", 4) Error en .jcall(rowCells[[ic]], "I", "getColumnIndex") : RcallMethod: invalid object parameter > res <- read.xlsx("C:/Users/FELIPE PARRA/Documents/Quantil/Federacion/Curva LIBOR.xlsx", 4) Error en .jcall(rowCells[[ic]], "I", "getColumnIndex") : RcallMetho...

...a > t = rbind(c(1,2,3),c(2,3,4),c(1,2,10)); > .jinit() > distanceMatrix = .jnew("data/structure/DistanceMatrix"); > .jmethods(distanceMatrix); ... other methods omitted for brevity ... [4] "public void data.structure.DistanceMatrix.setDistances(double[][])" > .jcall(distanceMatrix, "V", "setDistances", as.matrix(t)); Error in .jcall(distanceMatrix, "V", "setDistances", as.matrix(t)) : method setDistances with signature ([D)V not found Calls: .jcall -> .External Execution halted Thanks in advance, ben [[alternat...

...verClass=c("com.mysql.jdbc.Driver") drv <- JDBC(c("com.mysql.jdbc.Driver"),classPath,"`") This returns a NULL value and a java exception. > .jgetEx() [1] "Java-Object{java.lang.ClassNotFoundException: com.mysql.jdbc.Driver}" my java version is > .jcall('java.lang.System','S','getProperty','java.version') [1] "1.6.0_02" jre When I use java 1.5.0_11 jre I have the same problem but the .jgetEx() is > .jgetEx() [1] "Java-Object{} my class path is > .jclassPath() [1] "C:\\PROGRA~1\\R\\li...

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)...

...s 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;", "invokeMethod", cl, : java.lang.IllegalArgumentException: Your InputStream was neither an OLE2 stream, nor an OOXML stream > read.xlsx2(exf,1) Error in .jcall("RJavaTools", "Ljava/lang/Object;", "invoke...

Hi, I am trying to integrate my Java program with R using rJava package. I want to execute the whole Java program from R. The main() method in my Java code calls all the other defined methods. So, I guess I have to call the main() method in .jcall. An example Java code: *class A { public static int mySum(int x, int y) { return x+y; } public static void main (String[] arg) { System.out.println("The sum is " + mySum(2, 4)); } }* I can do the following to call the mySu...

Hello there, I want to create a string from strings and numbers, here is my code: str <- "name" & toString(20) but it returns me this error: Error in toString(20) : could not find function ".jcall" what did I do wrong? I couldn't find this error anywhere... -- View this message in context: http://n4.nabble.com/Error-with-toString-tp1290327p1290327.html Sent from the R help mailing list archive at Nabble.com.

...meters (the way the parameter vector changes is decided by either a finite difference method or the Jacobian function you supply). There are some strange things going on with your models; in the case of this call: out <- nls.lm(par = guess, fn = fcn, jac = fcn.jac, fcall = f.Th, jcall = j.Th, h = h, Th = Th, control = nls.lm.control(maxfev = integer(), maxiter = 10000, nprint=100)) The parameter estimates keep changing even after 1000 iterations. This is not good. In the second fit, I change the starting values slightly, to ##starting values (a...

Hola, estoy trabajando con el paquete xlsx y el xlConnect y ambos presentan este mismo error. Error in .jcall(cell, "V", "setCellValue", value) : java.lang.OutOfMemoryError: Java heap space Alguien conoce una solución. Alguien conoce otro paquete para guardar documento de excel y que no involucre el uso de Java. -- *Wilmer Contreras Sepulveda* *Grupo de Investigación en Desarrol...

I'm writing a package that successfully calls Java from R using rJava. When R sends my Java function bad data (through .jcall()), I get the error message details (when I run it on a console) and then: Java requested System.exit(1), closing R. Is there a way to call .jcall so that when Java receives bad data, the Java function will exit, but won't take down R with it? Thanks, Sigal

Reaching out to libguestfs@redhat.com. Thanks Shahar, I didn't know that email alias existed. Also, I made the XML, full logs, and sosreport from the VM in question available here [1] [1] -http://people.redhat.com/~jcall/tmp.cKGPeNjfi8/ Thank you, John Call Red Hat - Solutions Architect jcall@redhat.com (714) 267-8802 On Thu, Dec 29, 2016 at 2:40 AM, Shahar Havivi <shavivi@redhat.com> wrote: > try to ask libguestfs@redhat.com if you don't get answer here. > > On Wed, Dec 28, 2016 at 11:04 PM...

...a program from R and am running into some confusing issues. I've written this function: DoNormalSkew <- function() { .jaddClassPath("U:/development/software/untilities/ELVeSkew/dist/ELVeSkew.jar") .jpackage("U:/development/software/utilities/ELVeS/dist/ELVeSkew.jar") .jcall("java/lang/System", "V", method=Main.main(), "U:/development/software/utilities/ELVeSkew/test/csv", "U:/development/software/utilities/ELVeSkew/test/out.csv" } When I run this the function returns the following: Error in .jcall("java/lang/System...

...? ? ?control=Weka_control( > ? ? ? ? ? ?E="weka.attributeSelection.CfsSubsetEval", > ? ? ? ? ? ?S="weka.attributeSelection.BestFirst -D 1", > ? ? ? ? ? ?W="weka.classifiers.bayes.NaiveBayes -D")) > > But now, I get an error saying: > > Error in .jcall(classifier, "V", "buildClassifier", instances) : > ? java.lang.Exception: Can't find class called: > weka.classifiers.bayes.NaiveBayes -D > > indicating that the way I am passing the argument "-D" to the NaiveBayes > is incorrect. I am uncertain fr...

.../NaiveBayes") model<-NB(formula,data=data,...) # does not run but you get the idea save(model,file="model.dat") # simple save R command # ... load("model.dat") # load the model from the previously saved file... model # should work but I get instead this error: Error in .jcall(x$classifier, "S", "toString") : RcallMethod: attempt to call a method of a NULL object. What is wrong and how can I solve this problem? Regards, -- Paulo Alexandre Ribeiro Cortez (PhD, MSc) Lecturer (Prof. Auxiliar) at the Department of Information Systems (DSI) Universi...

...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 = read.xlsx("d:\\Krishna\\Research\\CFTC_COT\\cftcdata.xlsx", 1) Error in .jcall("RJavaTools", "Ljava/lang/Object;", "invokeMethod", cl, : java.lang.OutOfMemoryError: Java heap space > sessionInfo() R version 3.0.1 (2013-05-16) Platform: x86_64-w64-mingw32/x64 (64-bit) locale: [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_Unit...