matlab 多参数积分工具箱 multivariable calculus toolbox

				function y=type(V)
				%TYPE  Display type of coordinates.
				%   Displays either 'cart', 'sph' or 'cyl'.
				
				% Copyright 2001-04-15, B. Rasmus Anthin.
				
				if ~nargout
				   fprintf('\n     coords:   %s\n\n',V.coords)
				else
				   y=V.coords;
				end