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: projectionLength.m
    path of file: ./repos/mtex/EBSDAnalysis/@grain2d/private
    
    the code of the file until where you have to start completion: function pl = projectionLength(Vg,varargin)
% Returns the projection length of a group of vertices as a function
% of angle omega. omega=0 gives the projection length against the
% x.
%
% Syntax:
%  Vg = grains(1).V(grains.poly{1},:) % vertices of the first grain
%  pl = projectionLength(Vg,[0:10:179]*degree)
%
% Input:

    
function pl = projectionLength(Vg,varargin)
% Returns the projection length of a group of vertices as a function
% of angle omega. omega=0 gives the projection length against the
% x.
%
% Syntax:
%  Vg = grains(1).V(grains.poly{1},:) % vertices of the first grain
%  pl = projectionLength(Vg,[0:10:179]*degree)
%
% Input:
%  Vg     - list of vertices for a sngle grain
%  omegaP - list of angles (default 0:pi-1*degree in 1 degree steps)
%
% Output:
%  pl     - list of projection lengths as a function of omegaP


if nargin>1 && isnumeric(varargin{1})
    omegaP=varargin{1};
else
    omegaP = 0:1:179 * degree;
end