How can I skip initialization for a variable in further executions?

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Jilan Samiuddin 2015-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/184698-how-can-i-skip-initialization-for-a-variable-in-further-executions

编辑： Walter Roberson 2015-5-6

I want to skip initialization of my variable in further executions of my function, except for the first time. e.g.

w_hat = w_nom; %initialization
w_hat = w_hat + del_w; %update of my variable

So for the first time I want w_hat to hold the value of w_nom, but in the next step when the function is recalled, I want w_hat to hold the value from its previous update. So how do I skip the initialization in the second and further steps?

Thanks in advance! I hope I was clear with my question.

**Updated: I will implement the function file in SIMULINK and so except for the first time the function is called, the objective is to initiate w_hat with the previous updated w_hat.

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Raghav 2015-4-8

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You can make use of persistent variables in this situation. Ex:

   persistant w_hat;
   if(isempty(w_hat))
        w_hat = w_nom; %initialization
   else 
        w_hat = w_hat + del_w; %update of my variable
   end