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: sphereMesh.m
    path of file: ./repos/matGeom/matGeom/meshes3d
    
    the code of the file until where you have to start completion: function varargout = sphereMesh(sphere, varargin)
%SPHEREMESH Create a 3D mesh representing a sphere.

    
function varargout = sphereMesh(sphere, varargin)
%SPHEREMESH Create a 3D mesh representing a sphere.
%
%   [V, F] = sphereMesh(S)
%   Creates a 3D mesh representing the sphere S given by [xc yc zy r].
%
%   [V, F] = sphereMesh();
%   Assumes sphere is the unit sphere centered at the origin.
%
%   [V, F] = sphereMesh(S, 'nTheta', NT, 'nPhi', NP);
%   Specifies the number of discretisation steps for the meridians and the
%   parallels. Default values are nTheta = 16 and nPhi = 32.
%
%
%   Example
%     s = [10 20 30 40];
%     [v, f] = sphereMesh(s);
%     drawMesh(v, f);
%     view(3); axis equal; light; lighting gouraud;
%
%   See also 
%     meshes3d, drawSphere, ellipsoidMesh, cylinderMesh, surfToMesh
%

% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2012-10-25, using Matlab 7.9.0.529 (R2009b)
% Copyright 2012-2023 INRA - Cepia Software Platform

if nargin == 0
    sphere = [0 0 0 1];
end