Thanks for your prompt reply Martin. That should work, but still involves
changing the java code.

I was just hoping there might be an obvious solution I was missing. Sorry
for the mailing list wrongness. I didn't realise there was an rJava mailing
list.

Thanks,
ben

On 19/02/2008, Martin Morgan <mtmorgan@fhcrc.org> wrote:
>
> Ben
>
> R represents matrices as a vectors (the result of as.vector(t) on
> your data below) with a 'dim' attribute, and I bet that this is how
> they're passed to Java. Write a method with sig
>
> public void data.structure.DistanceMatrix.setDistances(double[] data,
> int[] dim)
>
> invoked along the lines of
>
> .jcall(distanceMatrix, "V", "setDistances", as.vector(t), dim(t))
>
> (sorry, I'm a bit rusty on this so details might be incorrect)
>
> This probably belongs on R-devel, if not on the rJava mailing list.
>
> Martin
>
> "Ben Woodcroft" <donttrustben@gmail.com> writes:
>
> > Hi list,
> >
> > I'm wanting to use a matrix as input to some java code, but I seem to be
> > unable to do this (See code below). When searching online for a solution
> I
> > found that rJava 0.5-2 (the version under development not yet in CRAN)
> is
> > adding "direct support for raw vectors as method parameters". Is this
> > related?
> >
> > I also tried to use .jarray / .jcast in various combinations to no
> avail.
> >
> > The only way I can think of to solve this is to modify the java code to
> > allow me to upload a row of the matrix one at a time.
> >
> > Any other ideas?
> >
> >> require(rJava);
> > Loading required package: rJava
> >> 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
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > 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.
>
> --
> Martin Morgan
> Computational Biology / Fred Hutchinson Cancer Research Center
> 1100 Fairview Ave. N.
> PO Box 19024 Seattle, WA 98109
>
> Location: Arnold Building M2 B169
> Phone: (206) 667-2793
>



-- 
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