era.pvdpv.md

eraPvdpv

adb = ERFA.pvdpv(a, b)

Inner (=scalar=dot) product of two pv-vectors.

Given:

   a        double[2][3]      first pv-vector
   b        double[2][3]      second pv-vector

Returned:

   adb      double[2]         a . b (see note)

Note:

   If the position and velocity components of the two pv-vectors are
   ( ap, av ) and ( bp, bv ), the result, a . b, is the pair of
   numbers ( ap . bp , ap . bv + av . bp ).  The two numbers are the
   dot-product of the two p-vectors and its derivative.

Called:

   eraPdp       scalar product of two p-vectors

This revision: 2021 May 11

Copyright (C) 2013-2021, NumFOCUS Foundation. Derived, with permission, from the SOFA library.