NumPy for R (and S-Plus) users http://mathesaurus.sourceforge.net/r-numpy.html

>>> a [1, 2, 3] >>> b [4, 5, 6] >>> A = numpy.array(a) >>> B = numpy.array(b) >>> d2 = numpy.power(A-B, 2).sum() >>> d2 27 >>> d2 = numpy.power(A-B, 2) >>> d2 array([9, 9, 9]) >>>