function [ out1, out2 ] = wind( varargin )
if nargin < 2 || nargin > 3
    error('Parameterzahl falsch');
end
if nargin == 2
    op = input ('geben sie eine Art der Berechnung ein (u,v in ff, dd = uv2ddff; dd,ffin u,v = ddff2uv)........:', 's');
end
if nargin == 3
    op = varargin{3};
end

p1 = varargin{1};
p2 = varargin{2};

out1 = p1+p2;
out2 = p1-p2;