Issues executing while loop

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Bryan
Bryan il 17 Lug 2019
Commentato: Star Strider il 18 Lug 2019
Hi guys,
I am not able to run this code. I plan to run this code which will make the 4 values in my DPnew array to be close enough with a certain tolerance percentage. I am using a while loop which works like a do while statement. It is not working all the time though. Sometimes it works and sometimes MATLAB starts to pause and debug the code. What is the issue with it? It is part of an algorithm so changing the formulas for the calculation is not an option.
DPbest = 0.4;
B = rand;
DPold = [0.2;0.4;0.6;0.8];
DPnew = [0;0;0;0];
vold = [0;0;0;0];
vnew = [0;0;0;0];
dataType = 'double';
while true
for i = 1:1:4
f = 0.3 + (0.5-0.3)*B;
vnew(i) = vold(i)+(DPold(i) - DPbest)*f;
if DPold(i) > DPbest
DPnew(i) = DPold(i) - abs(vnew(i));
else
DPnew(i) = DPold(i) + abs(vnew(i));
end
end
vold = vnew;
if abs((max(DPnew)-min(DPnew))/max(DPnew)) < 0.1
break;
end
end

Risposta accettata

Star Strider
Star Strider il 17 Lug 2019
When I ran the code you posted, the while loop becomes infinite if ‘min(DPnew)’ is negative. In that event, this expression:
abs((max(DPnew)-min(DPnew))/max(DPnew))
appears to increase until it reaches a value of about 3. (I don’t know if it increases beyond that, since I interrupted it before then.)
Trapping negative values of ‘DPnew’ and correcting them, or setting an additional limit on the while condition (for example, adding a counter and setting the additional while condition that the counter does not exceed some value), should solve that problem, or at least prevent the loop from becoming infinite.
I doubt MATLAB is pausing to debug the code.
  7 Commenti
Bryan
Bryan il 18 Lug 2019
Hi Stryder,
I see what you did there. It is good. Thanks for your help!
Star Strider
Star Strider il 18 Lug 2019
As always, my pleasure!

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