you should take a look at the doc of .jarray by input "?.jarray" in the console
and see related examples by "example(.jarray)" in the console.
This is what the doc says, and your issues might be related to it:
'.jevalArray' currently supports only a subset of all possible
array types. Recursive arrays are handled by returning a list of
references which can then be evaluated separately.
At 2011-04-25 20:27:24£¬hill0093 <hill0...@umn.edu> wrote:
>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
>>
>
>
>--
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>Sent from the R help mailing list archive at Nabble.com.
>
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