Replaced the @ operator with np.matmul for Python 2 backward compatibility. Not improve readability.
Replaced the @ operator with np.matmul for Python 2 backward compatibility. Not improve readability.

jhillairet/scikit-rf,scikit-rf/scikit-rf,jhillairet/scikit-rf,temmeand/scikit-rf,temmeand/scikit-rf,jhillairet/scikit-rf,temmeand/scikit-rf,scikit-rf/scikit-rf