rx¶
- erfa.rx(phi, r)[source]¶
Rotate an r-matrix about the x-axis.
- Parameters:
- phidouble array
- rdouble array
- Returns:
- rdouble array
Notes
Wraps ERFA function
eraRx
. Note that, unlike the erfa routine, the python wrapper does not change r in-place. The ERFA documentation is:- - - - - - e r a R x - - - - - - Rotate an r-matrix about the x-axis. Given: phi double angle (radians) Given and returned: r double[3][3] r-matrix, rotated Notes: 1) Calling this function with positive phi incorporates in the supplied r-matrix r an additional rotation, about the x-axis, anticlockwise as seen looking towards the origin from positive x. 2) The additional rotation can be represented by this matrix: ( 1 0 0 ) ( ) ( 0 + cos(phi) + sin(phi) ) ( ) ( 0 - sin(phi) + cos(phi) ) This revision: 2021 May 11 Copyright (C) 2013-2023, NumFOCUS Foundation. Derived, with permission, from the SOFA library. See notes at end of file.