Vectorize a nested loop

1 次查看（过去 30 天）
federico nutarelli
federico nutarelli 2022-11-28
编辑： Matt J 2022-11-28
Hi all,
is there a way to vectorize the following loop?
for RIPETIZIONE = 1:10
%for k = 1:size(lambda_tol_vector.Value,1)
parfor (k = 1:size(lambda_tol_vector.Value,1))
%fprintf('Completion using nuclear norm regularization... \n');
[CompletedMat,flag] = matrix_completion_nuclear_GG_vec( ...
A.Value.*double(B), double(B), N, lambda_tol_vector.Value(k), tol);
if flag==1
CompletedMat_parvec{RIPETIZIONE,k}=zeros(size(A));
end
CompletedMat_parvec{RIPETIZIONE,k}=CompletedMat;
end
end
  5 个评论
显示 3更早的评论
federico nutarelli
federico nutarelli 2022-11-28
编辑：federico nutarelli 2022-11-28
Oh sorry @Jan.
I will attach the function here.
As for pre-allocation I will check the best way to pre-allocate vell arrays.
federico nutarelli
federico nutarelli 2022-11-28
Oh @Jan another thing that I am nnoticing when putting the arfor loop on the outer one, is tht the final results in term of CompletedMat_parvec is different from the same result when I use only for loos (both outer and inner). Is there a way to make the two results equal?

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Matt J
Matt J 2022-11-28
编辑：Matt J 2022-11-28
EDITED:
R=10;
K=size(lambda_tol_vector.Value,1);
CompletedMat_parvec=cell(R,K);
B=double(B);
parfor n=1:R*K
[RIPETIZIONE,k]=ind2sub([R,K],n);
%fprintf('Completion using nuclear norm regularization... \n');
[CompletedMat,flag] = matrix_completion_nuclear_GG_vec( ...
A.Value.*B,B, N, lambda_tol_vector.Value(k), tol);
if ~flag
CompletedMat_parvec{n}=CompletedMat;
end
end
idx=cellfun('isempty', CompletedMat_parvec);
CompletedMat_parvec(idx)={zeros(size(A))};
  4 个评论
显示 2更早的评论
federico nutarelli
federico nutarelli 2022-11-28
编辑：federico nutarelli 2022-11-28
@Matt J same problem unfortunately. Maaybe we should index it by n? Thhough I don't think so since ideally I need CompletedMat_parvec{RIPETIZIONE,k}=...;
Furthermore it looks like the variable n is not creted when evaluaating the parfor loop.
Matt J
Matt J 2022-11-28
编辑：Matt J 2022-11-28
Yes! Sorry, you should be indexing by n,
if ~flag
CompletedMat_parvec{n}=CompletedMat;
end
It is equivalent to,
CompletedMat_parvec{RIPETIZIONE,k}=CompletedMat;

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息

标签

产品


版本

R2021b

Community Treasure Hunt

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

Start Hunting!

Translated by