Today's project was to try out jblas. I gained a greater appreciation of the language from just a few lines of code. The (simple) challenge: create matrix A and matrix B filled with random numbers, then multiply them. As a baseline, in R this can be done using three straightforward lines of code:
A <- matrix(rnorm(12),4,3)
B <- matrix(rnorm(12),3,4)
C <- A %*% B
Here is the Scala code:
object tryblas {
import org.jblas.DoubleMatrix
def main(args: Array[String]) {
val A = DoubleMatrix.randn(3,4)
val B = DoubleMatrix.randn(4,3)
val C = A.mmul(B)
}
}
import org.jblas.DoubleMatrix
def main(args: Array[String]) {
val A = DoubleMatrix.randn(3,4)
val B = DoubleMatrix.randn(4,3)
val C = A.mmul(B)
}
}
Type inference means I don't have to specify that A is "new DoubleMatrix" - the language figured that out for me! It's more lines than the R program, but not by much. There's a little overhead in a Scala program, and you have to import the jblas library. The Scala IDE even allows you to see the inferred type of A, B, or C by placing the cursor over the name. Impressive! The Java approach for some reason seems reasonable when I use Scala.
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