axb = ERFA.pxp(a, b)p-vector outer (=vector=cross) product.
a double[3] first p-vector
b double[3] second p-vector
axb double[3] a x b
It is permissible to re-use the same array for any of the
arguments.
This revision: 2021 May 11
Copyright (C) 2013-2021, NumFOCUS Foundation. Derived, with permission, from the SOFA library.