Share 'Matrix Multiplikation'

Hey to everybody I wrote I programm in processing, now I want to port the functionallity to a grasshoper patch. But i stuck in Matrix Multipliaktion: x = (3.037 *a   -1.25 *b + 0.239 * b);y = (0.42 * a + 2.325 * b -1.2440 * b);z = (-0.689 * a + 0.2 * b + 7.45 * b); How I can do... ist there a simple Block taht can do that. ? Thanks raphael