Removing repeat displays in Matlab

I am modelling a landing gear system and would like to be notified in the Matlab command space when it has been deployed

To do this I have a matlab function block in simulink with the following code:

--------------------------------------------

function y = fcn(u)

if u >= 0.5

disp('Nose LG Door 2 Deployed')

end

y = u;

-----------------------------------------

However I only want the display of Nose LG Door 2 Deployed to come up once in the command window, except currently it is constantly repeating until the simulation ends.

Does anyone know how to make it only appear once?

Answer 1

[A Jenkins]

 function y = fcn(u)

 persistent previous_u

 if isempty(previous_u)

    previous_u=0;

 end

 if u >= 0.5 && previous_u < 0.5

 disp('Nose LG Door 2 Deployed')

 end

 previous_u=u;

 y = u;