清空筛选条件
清空筛选条件

Nested for-Loops in parfor

3 次查看（过去 30 天）
LD
LD 2022-3-22
评论： LD 2022-4-10
I try to put a for-loop in a parfor-loop. However, the following code is invalid.
parfor i=1:10
for j=1:10
a(j)=1;
end
end
The only way I know to fix that is
parfor i=1:10
for j=1:10
a(i,j)=1;
end
end
But I think it is inefficient when the size of "a" is large (I don't need "a" at the end of this program) . Is there a better way to implement this nested for-loop?
  1 个评论
Edric Ellis
Edric Ellis 2022-3-23
@Walter Roberson has provided you with a way to fix the problem. Just to explain the problem a little bit more - parfor insists on being able to prove that the iterations of your parfor loop are not (trying to be) order-dependent. In your original code, it appears as though the value of a as assigned when i==1 is still available on the next iteration when i==2. Walter's fix assigns a value to the whole of a, and this makes parfor satisfied that you cannot possibly access the old values of a in subsequent iterations.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2022-3-22
parfor i=1:10
a = zeros(10, 1);
for j=1:10
a(j)=1;
end
end

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Parallel for-Loops (parfor) 的更多信息

标签

产品


版本

R2022a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by