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2010 Dec 28
1
rJava question
...and back
using rJava, but this method is not documented and I wonder if there is a
better way?
Anyway, here is what I found works:
(m = matrix(as.double(1:12),3,4))
[shows m as you would expect]
jtest <- .jnew("JTest")
(v <- .jcall(jtest, '[[D], 'myfunc', .jarray(m), evalArray=FALSE))
[shows v = m + 10]
Here the JTest class has a method named myfunc that accepts
a double[][] and returns a double[][]. It simply adds 10 to every
element.
The parameter 'evalArray' is confusing because when
evalArray=TRUE the result is NOT evaluated (a list is returned
that you the...