Yep, einsum is included in "doing numpy right." And for what it's worth, it's horrid to use and still won't get around cases like x -> cos(x). I haven't need

Yep, einsum is included in "doing numpy right." And for what it's worth, it's horrid to use and still won't get around cases like x -> cos(x). I haven't needed the power of eigen for a couple of years, but I appreciate the tip.