%LVDATA: This is data for a prey population H (for hare)
%and a predator population L (for lynx). 
years=0:20;
H=[30 47.2 70.2 77.4 36.3 20.6 18.1 21.4 22 25.4 27.1 ...
        40.3 57 76.6 52.3 19.5 11.2 7.6 14.6 16.2 24.7];
L=[4 6.1 9.8 35.2 59.4 41.7 19 13 8.3 9.1 7.4 ...
        8 12.3 19.5 45.7 51.1 29.7 15.8 9.7 10.1 8.6];