trxpv¶

erfa.trxpv(r, pv)[source]¶

Multiply a pv-vector by the transpose of an r-matrix.

Parameters:

rdouble array
pvdouble array

Returns:

trpvdouble array

Notes

Wraps ERFA function eraTrxpv. The ERFA documentation is:

- - - - - - - - -
 e r a T r x p v
- - - - - - - - -

Multiply a pv-vector by the transpose of an r-matrix.

Given:
   r        double[3][3]    r-matrix
   pv       double[2][3]    pv-vector

Returned:
   trpv     double[2][3]    r^T * pv

Notes:

1) The algorithm is for the simple case where the r-matrix r is not
   a function of time.  The case where r is a function of time leads
   to an additional velocity component equal to the product of the
   derivative of the transpose of r and the position vector.

2) It is permissible for pv and rpv to be the same array.

Called:
   eraTr        transpose r-matrix
   eraRxpv      product of r-matrix and pv-vector

This revision:  2021 May 11

Copyright (C) 2013-2023, NumFOCUS Foundation.
Derived, with permission, from the SOFA library.  See notes at end of file.

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trxpv¶