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: ComplexWatsonDistribution.m
    path of file: ./repos/libDirectional/lib/distributions/complexHypersphere
    
    the code of the file until where you have to start completion: classdef ComplexWatsonDistribution < AbstractComplexHypersphericalDistribution
    % ComplexWatsonDistribution represents a complex Watson distribution
    %
    % 
    
function Z = sample(this, N)
            % Use special case of complex Bingham distribution to sample from
            % a complex Watson distribution according to
            % Mardia, K. V. & Jupp, P. E. Directional statistics Wiley, 2009, page 336
            %
            % :param N: Number of requested samples
            % :type N: Integer scalar
            % :return Z: Sampled observation vectors,
            %   complex matrix with size #dimensions times #samples
            
            % Calculate the Bingham parameter matrix
            B = - this.kappa * (eye(length(this.mu)) - this.mu*this.mu');
            
            if ~ismatrix(B) || size(B, 1) ~= size(B, 2)
                error('sampleComplexBingham:B', 'Matrix B is not square.');
            end