From d54fe7c1f704a63824c5bfa0ece65245572e9b27 Mon Sep 17 00:00:00 2001 From: Joseph Hunkeler Date: Wed, 4 Mar 2015 21:21:30 -0500 Subject: Initial commit --- src/slalib/sun67.htx/node125.html | 107 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 107 insertions(+) create mode 100644 src/slalib/sun67.htx/node125.html (limited to 'src/slalib/sun67.htx/node125.html') diff --git a/src/slalib/sun67.htx/node125.html b/src/slalib/sun67.htx/node125.html new file mode 100644 index 0000000..2542649 --- /dev/null +++ b/src/slalib/sun67.htx/node125.html @@ -0,0 +1,107 @@ + + + + +SLA_M2AV - Rotation Matrix to Axial Vector + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_MAP - Mean to Apparent +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_KBJ - Select Epoch Prefix +

+

+

SLA_M2AV - Rotation Matrix to Axial Vector +   +

+
+
ACTION: +
From a rotation matrix, determine the corresponding axial vector +(single precision). +

CALL: +
CALL sla_M2AV (RMAT, AXVEC) +

+

+
GIVEN: +
+
+ + + + + +
RMATR(3,3)rotation matrix
+

+
RETURNED: +
+
+ + + + + +
AXVECR(3)axial vector (radians)
+

+
NOTES: +
+
1. +
A rotation matrix describes a rotation about some arbitrary axis. +The axis is called the Euler axis, and the angle through +which the reference frame rotates is called the Euler angle. + The axial vector returned by this routine has the same + direction as the Euler axis, and its magnitude is the Euler angle + in radians. +
2. +
The magnitude and direction of the axial vector can be separated + by means of the routine sla_VN. +
3. +
The reference frame rotates clockwise as seen looking along + the axial vector from the origin. +
4. +
If RMAT is null, so is the result. +
+
+ +next + +up + +previous +
+ Next: SLA_MAP - Mean to Apparent +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_KBJ - Select Epoch Prefix +

+

+

+SLALIB --- Positional Astronomy Library
Starlink User Note 67
P. T. Wallace
12 October 1999
E-mail:ptw@star.rl.ac.uk +
+ + -- cgit