Merge commit 'd26ed8388f100a12996c0b92a98040ef2ba7fa8e' as 'ast'

1 files changed, 127 insertions, 0 deletions

diff --git a/ast/erfa/rv2m.c b/ast/erfa/rv2m.c
new file mode 100644
index 0000000..9fe3c4b
--- /dev/null
+++ b/ast/erfa/rv2m.c
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+#include "erfa.h"
+
+void eraRv2m(double w[3], double r[3][3])
+/*
+**  - - - - - - - -
+**   e r a R v 2 m
+**  - - - - - - - -
+**
+**  Form the r-matrix corresponding to a given r-vector.
+**
+**  Given:
+**     w        double[3]      rotation vector (Note 1)
+**
+**  Returned:
+**     r        double[3][3]    rotation matrix
+**
+**  Notes:
+**
+**  1) A rotation matrix describes a rotation through some angle about
+**     some arbitrary axis called the Euler axis.  The "rotation vector"
+**     supplied to This function has the same direction as the Euler
+**     axis, and its magnitude is the angle in radians.
+**
+**  2) If w is null, the unit matrix is returned.
+**
+**  3) The reference frame rotates clockwise as seen looking along the
+**     rotation vector from the origin.
+**
+**  Copyright (C) 2013-2016, NumFOCUS Foundation.
+**  Derived, with permission, from the SOFA library.  See notes at end of file.
+*/
+{
+   double x, y, z, phi, s, c, f;
+
+
+/* Euler angle (magnitude of rotation vector) and functions. */
+   x = w[0];
+   y = w[1];
+   z = w[2];
+   phi = sqrt(x*x + y*y + z*z);
+   s = sin(phi);
+   c = cos(phi);
+   f = 1.0 - c;
+
+/* Euler axis (direction of rotation vector), perhaps null. */
+   if (phi > 0.0) {
+       x /= phi;
+       y /= phi;
+       z /= phi;
+   }
+
+/* Form the rotation matrix. */
+   r[0][0] = x*x*f + c;
+   r[0][1] = x*y*f + z*s;
+   r[0][2] = x*z*f - y*s;
+   r[1][0] = y*x*f - z*s;
+   r[1][1] = y*y*f + c;
+   r[1][2] = y*z*f + x*s;
+   r[2][0] = z*x*f + y*s;
+   r[2][1] = z*y*f - x*s;
+   r[2][2] = z*z*f + c;
+
+   return;
+
+}
+/*----------------------------------------------------------------------
+**  
+**  
+**  Copyright (C) 2013-2016, NumFOCUS Foundation.
+**  All rights reserved.
+**  
+**  This library is derived, with permission, from the International
+**  Astronomical Union's "Standards of Fundamental Astronomy" library,
+**  available from http://www.iausofa.org.
+**  
+**  The ERFA version is intended to retain identical functionality to
+**  the SOFA library, but made distinct through different function and
+**  file names, as set out in the SOFA license conditions.  The SOFA
+**  original has a role as a reference standard for the IAU and IERS,
+**  and consequently redistribution is permitted only in its unaltered
+**  state.  The ERFA version is not subject to this restriction and
+**  therefore can be included in distributions which do not support the
+**  concept of "read only" software.
+**  
+**  Although the intent is to replicate the SOFA API (other than
+**  replacement of prefix names) and results (with the exception of
+**  bugs;  any that are discovered will be fixed), SOFA is not
+**  responsible for any errors found in this version of the library.
+**  
+**  If you wish to acknowledge the SOFA heritage, please acknowledge
+**  that you are using a library derived from SOFA, rather than SOFA
+**  itself.
+**  
+**  
+**  TERMS AND CONDITIONS
+**  
+**  Redistribution and use in source and binary forms, with or without
+**  modification, are permitted provided that the following conditions
+**  are met:
+**  
+**  1 Redistributions of source code must retain the above copyright
+**    notice, this list of conditions and the following disclaimer.
+**  
+**  2 Redistributions in binary form must reproduce the above copyright
+**    notice, this list of conditions and the following disclaimer in
+**    the documentation and/or other materials provided with the
+**    distribution.
+**  
+**  3 Neither the name of the Standards Of Fundamental Astronomy Board,
+**    the International Astronomical Union nor the names of its
+**    contributors may be used to endorse or promote products derived
+**    from this software without specific prior written permission.
+**  
+**  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+**  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+**  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+**  FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+**  COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+**  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+**  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+**  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+**  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+**  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+**  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+**  POSSIBILITY OF SUCH DAMAGE.
+**  
+*/