Make Simulink remember the time, when a variable first exceeds a specific value

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Max E. 2015-9-2

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https://ww2.mathworks.cn/matlabcentral/answers/239154-make-simulink-remember-the-time-when-a-variable-first-exceeds-a-specific-value

编辑： Max E. 2015-9-4

I want to implement some kind of storage that remembers something when something else happened. in my case i want to remember the simulation time when the velocity gets lower than 22.5 m/s. i tried to do it with a matlab-function-block that has to input ports (the velocity and a clock) and with the following code:

function y=f(v,t)
  y=0
  if v==22.5
    y=t;
  end

i thought this would do nothing after the velocity fell below 22.5, but in fact it sets y to 0. It feels like i chose a pretty odd way to achieve my goal, can you tell me how to do it better or how to get it to work?