%%%%%%%%%%%%%%%%%%%%% Plotting Centre of Polygon  %%%%%%%%%%%%%%%%%%%%%
%
% PLOTCENT
% Usage: PLOTCENT(poly,col)
% Inputs:  poly - a vector who components are the vertices of the 
%          polygon whose center is to be plotted   

function dum = plotcent(poly, col)             
    
    C = mean(poly);                      % centre of gravity
    plot(real(C),imag(C), ['.' col]);    % plot centre in given color
    dum = [];