variable initial condition in matlab

[pankaj kumarParticipant]

om=2.64;
T=10*3.114/om;
t=0:0.01:T;
t0=0;
xzero =-0.01;yzero =.012;
x=(xzero-(1/(1-om^2))*cos(om*t0))*cos(t-t0);
y=(-yzero+(1/(1-om^2))*cos(om*t0))*sin(t-t0);

figure
plot(t,x)
figure
plot(t,y)
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In above code ,when x=0, I like to update initial condition xzero, yzero and t0 as follow
xzero=x; (i.e zero)
yzero=-0.8*y;(yzero will -0.8 times of instantaneous velocity)
t0=t; (t is time corresponding to x=0)

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