Betavol(x,R,fig)

Betacp of 2D or 3D point set.V = BETAAVOL(x,R) gives the area or volume V of the basic alpha shape

% BetaVOL(x,R,1) plots the Beta shape.
%
% % 2D Example - C shape
% t = linspace(0.6,5.7,500)';
% x = 2*[cos(t),sin(t)] + rand(500,2);
% subplot(221), Betavol(x,inf,1);
% subplot(222), Betavol(x,1,1);
% subplot(223), Betavol(x,0.5,1);
% subplot(224), Betavol(x,0.2,1);