68 IFF(x)工 S NONLINEAR THEN∈ HAVE To WORK JUST A BIT HARDER APPROXIMATE DIFFERENTAL EQVATIDW As BEFORE BUT WE LET MATLA8 WE HAVE SUPPLY I5 A ROGRAN丹 T CAN C0APTE义(=F(x;) GAVEN THE CURRENT VALVES OF X, x TE小CALL 0DE23 EXAMPLE:x+3×3=0 CUBIC SPRING . SX function [xdot] plant(t, x) 文=5(x) global n dot (1) (2); xdot(2)=-3*(x(1))^n; dot dot 'i eturn 8 call plant.m MIS PART global n x0=[-12] CALLS THE [T,x]=ode23(" plant',[012],x0); LIN EA艮 Of PAr n=1; subplot(211) 1ot(T,x(:,1),T1,x1(:,1),"--1); legend('Nonlinear,'Linear' label('x') label('Time') subplot(212) plot(T,x(:,2),T1,x1(:,2),--1) legend('Nonlinear,'Linear ylabel('V')