Tutorial of MATLAB

kr=[0:0.05:10];

fK=2*(sin(kr))./kr;

fL=2*(sin(4*kr))./kr;

fT=2*(sin(kr))./kr+2*(sin(4*kr))./kr

plot(kr, fL, 'blue')

hold all

plot(kr, fK, 'red')

hold all

plot(kr, fT, 'green')