clear persistent in function simulink

2020 5 14
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hallo,
i need to clear persistent in simulink function when ytyt==15 but it say this:
Function 'clear' is not supported for code generation and the coder.extrinsic directive cannot be applied to 'clear'. Rewrite your code so it does not use 'clear'.
so how i can do it ?
function y = fcn(u)
persistent ytyt;
if isempty(ytyt)
ytyt=u
end
ytyt=ytyt+1
if ytyt == 15
clear ytyt
end
y = ytyt
end

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