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## Copyright (C) 2014 Pooja Rao <poojarao12@gmail.com>
##
## This program is free software; you can redistribute it and/or modify it under
## the terms of the GNU General Public License as published by the Free Software
## Foundation; either version 3 of the License, or (at your option) any later
## version.
##
## This program is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
## details.
##
## You should have received a copy of the GNU General Public License along with
## this program; if not, see <http://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn  {Function File} {@var{rad} =} km2rad (@var{km})
## @deftypefnx {Function File} {@var{rad} =} km2rad (@var{km}, @var{radius})
## @deftypefnx {Function File} {@var{rad} =} km2rad (@var{km}, @var{sphere})
## Converts distance to angle by dividing distance by radius.
##
## Calculates the angles @var{rad} for the distances @var{km} in a sphere with
## @var{radius} (also in kilometers).  If unspecified, radius defaults to 6371,
## the mean radius of Earth.
##
## Alternatively, @var{sphere} can be one of "sun", "mercury", "venus", "earth",
## "moon", "mars", "jupiter", "saturn", "uranus", "neptune", or "pluto", in
## which case radius will be set to that object mean radius.
##
## @seealso{km2deg}
## @end deftypefn

## Author: Pooja Rao <poojarao12@gmail.com>

function rad = km2rad (km, radius = "earth")
 ## This function converts kilometers (km) to radians (rad)

  ## Check arguments
  if (nargin < 1 || nargin > 2)
    print_usage();
  elseif (ischar (radius))
    ## Get radius of sphere with default units (km)
    radius = spheres_radius (radius);
  ## Check input
  elseif (! isnumeric (radius) || ! isscalar (radius))
    error ("km2rad: RADIUS must be a numeric scalar");
  endif
  rad = km/radius;

endfunction

%!test
%! ratio = pi/180; 
%! assert (km2rad (10), ratio*km2deg (10), 10*eps);
%! assert (km2rad (10, 80), ratio*km2deg (10, 80), 10*eps);
%! assert (km2rad (10, "pluto"), ratio*km2deg (10, "pluto"), 10*eps);