maximum (or minimum) value in a time domain

Hi,

I have a problem I cannot solve and you might help me.

In my time-dependent analysis I would like to know the maximum of value of a variable, which has been reached at previous time steps. But I can't figure it out how to that.

If my variable is v(t), then I would like to know max(v(t=t0), (t=t1), ..., v(t=ti)) at each time step.

Do you think it is possible to do that?

Thanks,
Daniel