function lochness(n,f);
% Exemples: 
% lochness(10000,'(log(i).^4)') le monstre du Loch Ness
% lochness(1000,'i.^(3/2)') les arches
% lochness(1000,'(i.^3)/1013') le taureau
% lochness(400,'sin(sqrt(i))') 
% lochness(1000,'(i.^3)/1002') l'arène
% lochness(5000,'0.141593*i.^2')
% lochness(4000,'0.00339372*i.^2')
% lochness(5000,'-0.349805*i.^2')
% lochness(1000,'sin(i.^(3/2))') fourmi ivre
% lochness(4000,'pi*i.^2') parking
% lochness(1000,'(i.^2)/321') spirale de Cornu

% subplot(221);lochness(5000,'0.141593*i.^2')	% G(a n^2)
% subplot(222);lochness(4000,'0.00339372*i.^2')
% subplot(223);lochness(5000,'-0.349805*i.^2')
% »subplot(224);lochness(5000,'0.0324963*i.^2')

x=0;
y=0;
i=1:n;
t=eval(f);
x=cos(2*pi*t);
y=sin(2*pi*t);
X=cumsum(x);
Y=cumsum(y);
plot(X,Y)
axis off
axis equal
hold off


