string">'sph'</span>)
0081             coordinate = <span class="string">'spherical'</span>;
0082         <span class="keyword">else</span>
0083             coordinate = <span class="string">'cartesian'</span>;
0084         <span class="keyword">end</span>;
0085     <span class="keyword">case</span> <span class="string">'in_'</span>
0086         in_coord = varargin{i+1};
0087         <span class="keyword">if</span>(in_coord(1:3)==<span class="string">'sph'</span>)
0088             in_coordinate = <span clas