How to plot the value of one variable when another equals zero in MatLab or Simulink?

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Hi,
I've modeled the following second order nonlinear differential delay equation in both Matlab and Simulink.
xddot= -a*xdot - b*(x+x^3 )- c*x(t-1)
Where: xddot is the second derivative of x;
xdot is the first derivate of x;
a, b and c are constants;
I would like to get the software to output the value of x (displacement) when the velocity is zero, but I am unsure of how to do this. Any help you be much appreciated. Thanks
James

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