c = menu('Choose a plot', 'sine', 'cos', 'decaying exp')

t = 0:.1:5;

if (c == 1)
	y=sin(10*t);
	plot(t,y)
elseif (c == 2)
	y = cos(6*t);
	plot(t,y)
else 
	y = exp(-t);
	plot(t,y)
end