So the first few posts show that I found out how to get Java functions to return type double numbers to R. The arrays are still a problem.
Here is another of my attempts to understand how to get java arrays into R. The Java code in class CalqsLin for an array of constants named conArr and for a function returning an array is: public static double[][]conArr=new double[][] { { 10001,10002,10003,10004 },{ 20001,20002,20003,20004 },{ 30001,30002,30003,30004 } }; public final static double[][] arReturnTEST() { double[][]retArr=new double[3][4]; for(int i=0;i<3;i++)for(int j=0;j<4;j++)retArr[i][j]=i*1000+j; return(retArr); } I evidently do not know how to retrieve them in R, even with .jevalArray(): > arj34Ret <- .jcall(qsLin,returnSig="[[D","arReturnTEST") > ar34Ret <- .jevalArray(arj34Ret) Error in .jevalArray(arj34Ret) : object is not a Java object reference (jobjRef/jarrayRef). > connArr <- .jevalArray(qsLin.conArr) Error in .jevalArray(qsLin.conArr) : object 'qsLin.conArr' not found I need help from someone who calls Java from R. The whole session was: > library(rJava) > .jinit() > .jaddClassPath("C:/ad/j") > print(.jclassPath()) [1] "C:\\Users\\ENVY17\\Documents\\R\\win-library\\2.12\\rJava\\java" [2] "C:\\ad\\j" > qsLin <- .jnew("CalqsLin") > calStg <- "201104242359599999" > print(calStg) [1] "201104242359599999" > dblTim <- > .jcall(qsLin,returnSig="D","linTimOfCalqsStgIsLev",calStg,as.integer(-4)) > print(dblTim,digits=20) [1] 634709087999999 > calStg <- > .jcall(qsLin,returnSig="S","calqsStgOfLinTimIsLev",dblTim,as.integer(-4)) > print(calStg) [1] "201104242359599999" > dblTim <- > .jcall(qsLin,returnSig="D","linTimOfCalqsStgIsLev",calStg,as.integer(-4)) > print(dblTim,digits=20) [1] 634709087999999 > arj34Ret <- .jcall(qsLin,returnSig="[[D","arReturnTEST") > ar34Ret <- .jevalArray(arj34Ret) Error in .jevalArray(arj34Ret) : object is not a Java object reference (jobjRef/jarrayRef). > connArr <- .jevalArray(qsLin.conArr) Error in .jevalArray(qsLin.conArr) : object 'qsLin.conArr' not found > -- View this message in context: http://r.789695.n4.nabble.com/Using-Java-methods-in-R-tp3469299p3473023.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.