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: circ_symtest.m
    path of file: ./repos/Image-Harmonization-Dataset-iHarmony4/Xue et al/dependency/CircStat2011f
    
    the code of the file until where you have to start completion: function pval = circ_symtest(alpha)
%
% [pval, z] = circ_symtest(alpha,w)
%   Tests for symmetry about the median.

    
function pval = circ_symtest(alpha)
%
% [pval, z] = circ_symtest(alpha,w)
%   Tests for symmetry about the median.
%   H0: the population is symmetrical around the median
%   HA: the population is not symmetrical around the median

%
%   Input:
%     alpha	sample of angles in radians
%
%   Output:
%     pval  p-value
%
% PHB 3/19/2009
%
% References:
%   Biostatistical Analysis, J. H. Zar, 27.4
%
% Circular Statistics Toolbox for Matlab

% By Philipp Berens, 2009
% berens@tuebingen.mpg.de - www.kyb.mpg.de/~berens/circStat.html

if size(alpha,2) > size(alpha,1)
	alpha = alpha';
end