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% /*-----------------------------------------------------------------*/
% /*!
% \file mexcompute.m
% \brief simple computation with a file and a date provided on the command line
% e.g.: matlab -nosplash -nodesktop -r mexcompute('myfile.dat',2.451545E+06)
% or .e.g: matlab -nosplash -nodesktop -r mexcompute('example1.dat',2.451545E+06)
%
% \author M. Gastineau
% Astronomie et Systemes Dynamiques, IMCCE, CNRS, Observatoire de Paris.
%
% Copyright, 2018, CNRS
% email of the author : Mickael.Gastineau@obspm.fr
%
% History:
% */
% /*-----------------------------------------------------------------*/
%
%
% /*-----------------------------------------------------------------*/
% /* License of this file :
% This file is "triple-licensed", you have to choose one of the three licenses
% below to apply on this file.
%
% CeCILL-C
% The CeCILL-C license is close to the GNU LGPL.
% ( http://www.cecill.info/licences/Licence_CeCILL-C_V1-en.html )
%
% or CeCILL-B
% The CeCILL-B license is close to the BSD.
% (http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.txt)
%
% or CeCILL v2.1
% The CeCILL license is compatible with the GNU GPL.
% ( http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.html )
%
%
% This library is governed by the CeCILL-C, CeCILL-B or the CeCILL license under
% French law and abiding by the rules of distribution of free software.
% You can use, modify and/ or redistribute the software under the terms
% of the CeCILL-C,CeCILL-B or CeCILL license as circulated by CEA, CNRS and INRIA
% at the following URL "http://www.cecill.info".
%
% As a counterpart to the access to the source code and rights to copy,
% modify and redistribute granted by the license, users are provided only
% with a limited warranty and the software's author, the holder of the
% economic rights, and the successive licensors have only limited
% liability.
%
% In this respect, the user's attention is drawn to the risks associated
% with loading, using, modifying and/or developing or reproducing the
% software by the user in light of its specific status of free software,
% that may mean that it is complicated to manipulate, and that also
% therefore means that it is reserved for developers and experienced
% professionals having in-depth computer knowledge. Users are therefore
% encouraged to load and test the software's suitability as regards their
% requirements in conditions enabling the security of their systems and/or
% data to be ensured and, more generally, to use and operate it in the
% same conditions as regards security.
%
% The fact that you are presently reading this means that you have had
% knowledge of the CeCILL-C,CeCILL-B or CeCILL license and that you accept its terms.
% */
% /*-----------------------------------------------------------------*/
% /*-----------------------------------------------------------------*/
% /* main program */
% /*-----------------------------------------------------------------*/
function mexcompute(filename,jd0)
% open the ephemeris file
peph = CalcephBin.open(filename);
% perform the computation
PV = peph.compute_unit(jd0, 0E0, NaifId.EARTH, NaifId.SUN, Constants.UNIT_AU+Constants.UNIT_DAY+Constants.USE_NAIFID);
printf('julian date : %f\n',jd0)
disp('heliocentric coordinates of the Earth in km and km/s')
disp('cartesian heliocentric position of the Earth : ')
PV(1:3)
disp('cartesian heliocentric velocity of the Earth : ')
PV(4:6)
% close the ephemeris file
peph.close();
end
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