Delay in for loop

4 次查看（过去 30 天）
Joe Ajay
Joe Ajay 2012-12-28
Hi,
This is my code. executing a function and writing the values in an excel file.
After certain iterations 'n' it has to find the average of the values and that is how I planned.
But somewhere it went wrong and when I give 'n' as 2. i.e the no.of iteration for for loop be 2.
Instead of getting the result with in 5 or 7 seconds (when I do not calculate the average) The loop doesn't stop also it doesn't give any error msg.
When I close the Matlab window and open the written file there I get my answer written in the excel file.
What makes the for loop to take so long and what happens during that time.
Is there any way I can get the average of the values it.
Thanks
for i=1:n
tic;
[X,FVAL] = ga(@func1a,4,[],[],[],[],[-2 500 45 200],[2 1800 72 1600],[],optimset('TolX',1e-12));
t=toc;
if (i==1)
y(i,:)=[[],[],X,t];
cel = sprintf('A%i', i);
w = {'GA','Trail.No','A','B','C','D','Time';[],i,X(1),X(2),X(3),X(4),t};
xlswrite('d:\Office.xls',w,1,cel);
else
y(i,:)=[[],[],X,t];
cel = sprintf('A%i', i+1);
a={[],i,X(1),X(2),X(3),X(4),t};
xlswrite('d:\Office.xls',a,1,cel);
while i==n
a=sum(y)/n;
cel = sprintf('A%i', i+2);
xlswrite('d:\Office.xls',a,1,cel);
end
end
end

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回答（1 个）

Walter Roberson
Walter Roberson 2012-12-28
In your loop you have
while i==n
a=sum(y)/n;
cel = sprintf('A%i', i+2);
xlswrite('d:\Office.xls',a,1,cel);
end
but inside that loop you do not change "i" and you do not change "n" so if the loop condition is ever true it will remain true and you infinite loop.

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