Keeping the value of a constant once it reaches that value using IF else statement??

Question

Juan Nunez 2016-5-10

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/283442-keeping-the-value-of-a-constant-once-it-reaches-that-value-using-if-else-statement

评论： Juan Nunez 2016-5-10

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Hello,

I'm trying to generate the following function:

function K  = Table(Is,Imax,Phiref,Phi)
K=0;
Sa=0;
Sb=0;
Sc=0;
if Phi<0.98*Phiref
    if Is<Imax+0.5
        Sa=0;
        Sb=1;
        Sc=1;   
    else
        Sa=0;
        Sb=0;
        Sc=0;  
    end
else
    K=1;
end

Once that K=1, it must keep this value (1) during the rest of execution no matter the conditions in the function.

Thanks

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Juan Nunez 2016-5-10

Thanks Walter. It worked!!

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Answer 1

Walter Roberson 2016-5-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/283442-keeping-the-value-of-a-constant-once-it-reaches-that-value-using-if-else-statement#answer_221539

在 MATLAB Online 中打开

function K  = Table(Is,Imax,Phiref,Phi)
  persistent stick
  if isempty(stick); stick = 0; end
Sa=0;
Sb=0;
Sc=0;
if Phi<0.98*Phiref
    if Is<Imax+0.5
        Sa=0;
        Sb=1;
        Sc=1;   
    else
        Sa=0;
        Sb=0;
        Sc=0;  
    end
else
    stick = 1;
end
   K = stick;

The only way to un-stick is to "clear Table", as you said it had to keep the value "no matter the conditions in the function", which tells us that no matter what inputs are given (such as if you wanted to start another loop) that Table needs to keep returning 1 if it has ever returned 1 at any point during the current MATLAB session.