From 40e5a5811c6ffce9b0974e93cdd927cbcf60c157 Mon Sep 17 00:00:00 2001 From: Joe Hunkeler Date: Tue, 11 Aug 2015 16:51:37 -0400 Subject: Repatch (from linux) of OSX IRAF --- math/slalib/doc/deuler.hlp | 50 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 math/slalib/doc/deuler.hlp (limited to 'math/slalib/doc/deuler.hlp') diff --git a/math/slalib/doc/deuler.hlp b/math/slalib/doc/deuler.hlp new file mode 100644 index 00000000..1dc55844 --- /dev/null +++ b/math/slalib/doc/deuler.hlp @@ -0,0 +1,50 @@ +.help deuler Jun99 "Slalib Package" +.nf + + SUBROUTINE slDEUL (ORDER, PHI, THETA, PSI, RMAT) + + - - - - - - - + D E U L + - - - - - - - + + Form a rotation matrix from the Euler angles - three successive + rotations about specified Cartesian axes (double precision) + + Given: + ORDER c*(*) specifies about which axes the rotations occur + PHI d 1st rotation (radians) + THETA d 2nd rotation ( " ) + PSI d 3rd rotation ( " ) + + Returned: + RMAT d(3,3) rotation matrix + + A rotation is positive when the reference frame rotates + anticlockwise as seen looking towards the origin from the + positive region of the specified axis. + + The characters of ORDER define which axes the three successive + rotations are about. A typical value is 'ZXZ', indicating that + RMAT is to become the direction cosine matrix corresponding to + rotations of the reference frame through PHI radians about the + old Z-axis, followed by THETA radians about the resulting X-axis, + then PSI radians about the resulting Z-axis. + + The axis names can be any of the following, in any order or + combination: X, Y, Z, uppercase or lowercase, 1, 2, 3. Normal + axis labeling/numbering conventions apply; the xyz (=123) + triad is right-handed. Thus, the 'ZXZ' example given above + could be written 'zxz' or '313' (or even 'ZxZ' or '3xZ'). ORDER + is terminated by length or by the first unrecognized character. + + Fewer than three rotations are acceptable, in which case the later + angle arguments are ignored. If all rotations are zero, the + identity matrix is produced. + + P.T.Wallace Starlink 23 May 1997 + + Copyright (C) 1997 Rutherford Appleton Laboratory + Copyright (C) 1995 Association of Universities for Research in Astronomy Inc. + +.fi +.endhelp -- cgit