Sliced variable issue - variable cannot be classified
조회 수: 1 (최근 30일)
이전 댓글 표시
Dear All,
I'm trying to use parallel workers in an optimization problem but I cannot define X and Y as sliced variables. X contains the population, Y contains the fitness values. As the error message says: variable X & Y in a parfor cannot be classified.
First I define X, (it has to be outside the parfor loop otherwise I get new X-es in every single loop); than parfor follows:
parfor t=1:T
TmpZ=Func(Z(1,:));TmpX=Func(X(t,:));
if TmpZ < TmpX
X(t,:)=Z(1,:); Y(t,1)=TmpZ;
else
X(t,:)=X(t,:); Y(t,1)=TmpX;
end
end
Thanks
댓글 수: 0
채택된 답변
Edric Ellis
2019년 5월 7일
I augmented your code a tiny bit to make it executable, and it works fine in MATLAB R2019a, and I checked all the way back to R2013b...
T = 7;
Func = @sum;
Z = rand(1, 3);
X = rand(T, 3);
parfor t=1:T
TmpZ=Func(Z(1,:));TmpX=Func(X(t,:));
if TmpZ < TmpX
X(t,:)=Z(1,:); Y(t,1)=TmpZ;
else
X(t,:)=X(t,:); Y(t,1)=TmpX;
end
end
댓글 수: 0
추가 답변 (1개)
Axel Groniewsky
2019년 5월 7일
댓글 수: 2
Edric Ellis
2019년 5월 7일
This code is not order-independent, and cannot run inside parfor. Basically, the problem is that you're accessing elements of X that might or might not yet have been updated.
참고 항목
카테고리
Help Center 및 File Exchange에서 Loops and Conditional Statements에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!