[R] Using Java methods in R

Gabor Grothendieck ggrothendieck at gmail.com
Sat Apr 23 14:41:30 CEST 2011

On Sat, Apr 23, 2011 at 8:32 AM, hill0093 <hill0093 at umn.edu> wrote:
> No answer to my post,
> so let's try a simpler question. Am I doing this correctly?
> I have the RGui with R Console on the screen.
> On rhe top pullDowns, Packages > Install Packages > USA(IA)> rJava
>> library(rJava)
>> .jinit()
>> qsLin <- .jnew("C:/ad/j/CalqsLin")
> Error in .jnew("C:/ad/j/CalqsLin") :
>  java.lang.NoClassDefFoundError: C:/ad/j/CalqsLin
> So I got this error which means I don't understand very much.
> I go to C:/ad/j and get
> C:\ad\j>dir CalqsLin.class
>  Volume in drive C has no label.
>  Volume Serial Number is 9A35-67A2
>  Directory of C:\ad\j
> 04/23/2011  07:11 AM            14,651 CalqsLin.class
>               1 File(s)         14,651 bytes
>               0 Dir(s)  104,257,716,224 bytes free
> Just to show my intentions,
> I had next wanted to call this java function method:
> linTimOfCalqsStgIsLev("201104052359599999",-4) using:
>> dblTim <-
>> .jcall(qsLin,"D","linTimOfCalqsStgIsLev","201104052359599999","-4")
> but that will probably also be wrong?
> Obviously I don't understand.

Have a look at the source of other packages that use rJava.  Such
packages are listed at the bottom of this page:

Also note that there is a separate list for R and Java:

Statistics & Software Consulting
GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
email: ggrothendieck at gmail.com

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