RClient

A bridge to R.

In a Scala application, an instance of this class is created using its companion object as shown below.

In an R script, the object R is an instance of this class available in an rscala bridge created by calling the function scala from the package rscala. It is through this instance that callbacks to the original R interpreter are possible.

All of the evaluation methods of this class have the same signature. The first argument is a template for an R expression, where %- is a placeholder for items that are provided as variable arguments. The result type is indicated by the suffix of the method name. See examples below.

This class is threadsafe.

val R = org.ddahl.rscala.RClient()

val a = R.evalD0("sd(rnorm(1000, mean=%-, sd=%-))", 1.0, 2.0)

R.eval("primes <- %-", Array(2, 3, 5, 7, 11, 13, 17, 19, 23))
val rFunction = R.evalObject("function(x) x*primes")
val primesTimesTwo = R.evalI1("%-(2)", rFunction)

val m = R.evalI2("matrix(rbinom(%-, size=10, prob=0.5), nrow=2)", 8)

R.quit()