Stop updating during a FOR loop

Question

Jaffatron 2016-1-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/263025-stop-updating-during-a-for-loop

编辑： jgg 2016-1-7

I have a question regarding a FOR loop.

I'm looking to calculate 2 values (and their control limits) using a FOR loop over time from a variable, F, in a moving window. I've 2 functions, 1 to calculate the values and another to calculate the control limits. And when the value is above it's control limit for 4 consecutive values a true fault is detected. What I'm looking to do is for when a true fault occurs for a point of time after I want to hold the limits to flush out all the faulty data before updating my model again

My code so far is:

 NOC1 = Get_Control(F); %%get initial control limit
 for i = 1:(size(F,1))
    abx = F(i,:); %%add the new value each time
    MRSS= Get_Values(abx,NOC1); %%Works out the values of Q and T
    %Calculate Q
    Q_new = MRSS.Q;
    Q = [Q; Q_new];
    QLimit= [QLimit; QLimit_new];
    % Calculate T
    T_new= MRSS.T;
    T= [T; T_new];
    TLimit = [T2cfdLimit; T2cfdLimit_new];
 % Update the model
     abx = abx(2:end,:); %%takes away oldest value
    if i > 5 && Q(i) > QLimit(i) && all(Q(i-4:i) > QLimit(i-4:i))
        QLimit_new = QLimit(end);
        TLimit_new = TLimit(end); %%therefore not updating the limits during the fault          
    else
     % Calculate new limits
        NOC1 = Get_Control(abx); 
        QLimit_new = NOC1.QLimit;
        TLimit_new = NOC1.TLimit;
    end
end

Basically what I'm looking for is a way to stop the control limits updating for a certain length of time to flush out all the faulty data. I've a feeling I have to put a for loop in after the if statement however this won't stop the updating;

I was thinking something like:

    if i > 5 && Q(i) > QLimit(i) && all(Q(i-4:i) > QLimit(i-4:i))
        for j = i:(i+Xwindow)        
        QLimit_new = QLimit(end);
        TLimit_new = TLimit(end); %%therefore not updating the limits during the fault                 
        end
    end

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Answer 1

jgg 2016-1-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/263025-stop-updating-during-a-for-loop#answer_205438

编辑：jgg 2016-1-7

在 MATLAB Online 中打开

I think I would suggest something like this:

 NOC1 = Get_Control(F); %%get initial control limit
 fault_state = 0;
 for i = 1:(size(F,1))
    abx = F(i,:); %%add the new value each time
    MRSS= Get_Values(abx,NOC1); %%Works out the values of Q and T
    %Calculate Q
    Q_new = MRSS.Q;
    Q = [Q; Q_new];
    QLimit= [QLimit; QLimit_new];
    % Calculate T
    T_new= MRSS.T;
    T= [T; T_new];
    TLimit = [T2cfdLimit; T2cfdLimit_new];
 % Update the model
     abx = abx(2:end,:); %%takes away oldest value
    if i > 5 && Q(i) > QLimit(i) && all(Q(i-4:i) > QLimit(i-4:i)) && fault_state == 0 %new fault detected
        fault_state = Xwindow;  %if a fault is detected, start a countdown
    end
    if fault_state > 0
        QLimit_new = QLimit(end);
        TLimit_new = TLimit(end); %%therefore not updating the limits during the fault   
        fault_state = fault_state - 1;
    else
     % Calculate new limits
        NOC1 = Get_Control(abx); 
        QLimit_new = NOC1.QLimit;
        TLimit_new = NOC1.TLimit;        
    end
 end

Basically, the idea is to create a countdown timer. When you detect an error, start the timer. Only update the values when the timer is zero, otherwise hold on the old values. I can't debug this since I don't have your code, but I think this should be roughly what you want to do.