pvdpv¶
-
erfa.
pvdpv
(a, b)[source]¶ Wrapper for ERFA function
eraPvdpv
.- Parameters
- adouble array
- bdouble array
- Returns
- adbdouble array
Notes
The ERFA documentation is below.
- - - - - - - - - e r a P v d p v - - - - - - - - - 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 Copyright (C) 2013-2019, NumFOCUS Foundation. Derived, with permission, from the SOFA library. See notes at end of file.