help on programming a control function for double integrator system

Hello all,

Please could you help me out programming the following controller using matlab or simulink. I'm just beginning with matlab programming.

for the system

x1dot = x2;

x2dot = u + (2+3*sin(t));

the control input u is

u= -k1*sign(phi1)*(abs(phi1))^1/2 - integral from 0 to t (k3*sign(phi1) dt)

phi1 = x2 + k2*sign (x1)*((abs(x1))^2/3)

initial conditions :

x(1) = -1; x2(0) = 3

gains k1= 6, k2= 4; k3 = 4

Thank you so much for any help

best regards