Consider preallocating for speed

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Yudha Bosse
Yudha Bosse on 31 Dec 2020
Answered: Ameer Hamza on 31 Dec 2020
Hello,
i worked out the following code for my college assignment, and i got the error message as "consider for preallocation of speed "for the variable A. I've got this code from https://www.mathworks.com/matlabcentral/fileexchange/47281-fuzzy-traffic-light-controller for reference. i don't know how to clear this message pls help me.
A(i)=ceil(((x(b(i))+(enter/exit)*time); % warning message
for j=1:A(i)+1
x(b(i))=x(b(i))-exit;
xrand=round(abs(rand(1,4)));
x=x+xrand;
if x(b(i))<=0
x(b(i))=0;
createfigure2(x,y,figure1);
pause(exittime)
break
end
end

Accepted Answer

Ameer Hamza
Ameer Hamza on 31 Dec 2020
It is not an error message; it is just a warning. Pre-allocation helps make the code faster. Read my answer here to get a general idea: https://www.mathworks.com/matlabcentral/answers/614903-for-loop-preallocation-warning

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