From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001 From: Joseph Hunkeler Date: Wed, 8 Jul 2015 20:46:52 -0400 Subject: Initial commit --- math/slalib/doc/m2av.hlp | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 math/slalib/doc/m2av.hlp (limited to 'math/slalib/doc/m2av.hlp') diff --git a/math/slalib/doc/m2av.hlp b/math/slalib/doc/m2av.hlp new file mode 100644 index 00000000..51d04343 --- /dev/null +++ b/math/slalib/doc/m2av.hlp @@ -0,0 +1,38 @@ +.help m2av Jun99 "Slalib Package" +.nf + + SUBROUTINE slM2AV (RMAT, AXVEC) + + - - - - - + M 2 A V + - - - - - + + From a rotation matrix, determine the corresponding axial vector + (single precision) + + 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. (The + magnitude and direction can be separated by means of the routine + slVN.) + + Given: + RMAT r(3,3) rotation matrix + + Returned: + AXVEC r(3) axial vector (radians) + + The reference frame rotates clockwise as seen looking along + the axial vector from the origin. + + If RMAT is null, so is the result. + + P.T.Wallace Starlink 11 April 1990 + + Copyright (C) 1995 Rutherford Appleton Laboratory + Copyright (C) 1995 Association of Universities for Research in Astronomy Inc. + +.fi +.endhelp -- cgit