save n-Numbers of last interation from a loop

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Jan Krumpak
Jan Krumpak 2018-11-28
回答： Jan 2018-11-28
hello
i want to save always the last n (n between 1 and 6) interation of a loop.
i have a regulator which is read out in a loop. now i need always the last n inerations of the loop to calculate the desirerd condition.
function ReglerButtonPushed(app, event)
k= app.KWertSlider.Value;
bereich= app.BereichSlider.Value;
speed= app.SpeedSlider.Value;
fehlervek= zeros(6,1);
l
app.stopRegler = false;
while app.stopRegler == false
b = getBrightness(app,app.sensorPos(1),app.sensorPos(2));
app.HelligkeitEditField.Value=b;
fehler = b - 0.5; %actual mistake
i know how to save all mistakes - i just need the actually last n interations.

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采纳的回答

Jan
Jan 2018-11-28
n = 6;
fehlerVec = nan(1, n);
while app.stopRegler == false
b = getBrightness(app,app.sensorPos(1),app.sensorPos(2));
app.HelligkeitEditField.Value=b;
fehler = b - 0.5; %actual mistake
fehlerVec = [fehler(2:n), fehler];
end
Now fehlerVec contains the last n elements. There are more efficient solutions, but collecting these n values is most likely not the time-crticial part.

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