[R] How do I use simple calls to java methods?
Jeff Newmiller
jdnewmil at dcn.davis.CA.us
Tue Oct 22 16:38:31 CEST 2013
I don't use rJava, but numerous examples came up when I Googled for "rjava examples". The fact that you have not referenced any of that material may be leaving a bad taste in the mouths of those few people who do use both R and Java. Or, they may just not spend time wading through emails on this list.
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Hurr <hill0093 at umn.edu> wrote:
>I am surprised to not get a reply.
>I suppose this means that extremely few, if any, use rJava.
>
>rJava.pdf says this, but I am too stupid to interpret it:
>Description
>.jcall calls a Java method with the supplied arguments.
>Usage
>.jcall(obj, returnSig = "V", method, ..., evalArray = TRUE,
>evalString = TRUE, check = TRUE, interface = "RcallMethod",
>simplify = FALSE, use.true.class = FALSE)
>
>Perhaps it means that to replace:
> calCk <- calStgOfLinTim(linTm,tlev)
>and use something like:
> calCk <- .jcall(CalqsLin.class,returnSig = "S",
> calStgOfLinTim(linTm,tlev),evalArray=FALSE,
> evalString = TRUE, check = TRUE, interface = "RcallMethod",
> simplify = FALSE, use.true.class = TRUE)
>
>I suppose there are other setup things to do,
>like start the JVM (java Virtual machine)
>and I don't know what obj means.
>
>Anyway, if I am able to do these simple java method calls,
>it will be a big plus to our data analysis lab to use R conveniently.
>
>Please help
>
>
>
>
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>
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