Multiply one dimension of a 3D Matrix by a vector

19 次查看（过去 30 天）
James Brown
James Brown 2020-12-18
评论： James Brown 2020-12-18
I wish to element multiply the third dimension of Matrix A by vector B by for all xy points. The following operation takes 329 seconds.
Is there an operation that avoids the for loops?
My Code:
Matrix A has dimensions A(2048,200,513)
Vector B has dimension(513)
C = zeros(numx,numy,numz);
for j = 1:numy
for i = 1:numx
Az = squeeze(A(i,j,:));
C(i,j,:) = squeeze(B.*Az);
end
end

请先登录，再回答此问题。

采纳的回答

James Tursa
James Tursa 2020-12-18
编辑：James Tursa 2020-12-18
C = A .* reshape(B,1,1,[]);
For earlier versions of MATLAB that do not have implicit expansion it would be this:
C = bsxfun(@times,A,reshape(B,1,1,[]));

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息

标签

产品


版本

R2019a

Community Treasure Hunt

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

Start Hunting!

Translated by