Removing repeat displays in Matlab

3 次查看（过去 30 天）
James
James 2015-4-2
编辑： A Jenkins 2015-4-2
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?

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回答（1 个）

A Jenkins
A Jenkins 2015-4-2
编辑：A Jenkins 2015-4-2
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;

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