You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: vectorCross3d.m
    path of file: ./repos/matGeom/matGeom/deprecated/geom3d
    
    the code of the file until where you have to start completion: function c = vectorCross3d(a,b)
%VECTORCROSS3D Vector cross product faster than inbuilt MATLAB cross.
%
%   C = vectorCross3d(A, B) 
%   returns the cross product of the 3D vectors A and B, that is: 
%       C = A x B
%   A and B must be N-by-3 element vectors. If either A or B is a 1-by-3
%   row vector, the result C will have the size of the other input and will
%   be the  concatenation of each row's cross product. 
%
%   Example
%     v1 = [2 0 0];
%     v2 = [0 3 0];
%     vectorCross3d(v1, v2)
%     ans =
%         0   0   6
%
%   Class support for inputs A,B:
%      float: double, single
%
%   See also DOT.

    
function c = vectorCross3d(a,b)
%VECTORCROSS3D Vector cross product faster than inbuilt MATLAB cross.
%
%   C = vectorCross3d(A, B) 
%   returns the cross product of the 3D vectors A and B, that is: 
%       C = A x B
%   A and B must be N-by-3 element vectors. If either A or B is a 1-by-3
%   row vector, the result C will have the size of the other input and will
%   be the  concatenation of each row's cross product. 
%
%   Example
%     v1 = [2 0 0];
%     v2 = [0 3 0];
%     vectorCross3d(v1, v2)
%     ans =
%         0   0   6
%
%   Class support for inputs A,B:
%      float: double, single
%
%   See also DOT.

% ------
% Author: Sven Holcombe
% E-mail: N/A
% Created: ?
% Copyright ?

% deprecation warning
warning('geom3d:deprecated', ...
    [mfilename ' is deprecated, use ''crossProduct3d'' instead']);

sza = size(a);
szb = size(b);

% Initialise c to the size of a or b, whichever has more dimensions. If
% they have the same dimensions, initialise to the larger of the two
switch sign(numel(sza) - numel(szb))
    case 1
        c = zeros(sza);
    case -1
        c = zeros(szb);
    otherwise
        c = zeros(max(sza, szb));
end