Speed up code:: Code is working but slow..
显示 更早的评论
Hi ,
The code is working fine, but it's very slow... any suggestions ?
clearvars;
clc;
C(1:3,1:3,1:3,1:3) = rand(3,3,3,3)
T = [cos(theta) sin(theta) 0;
-sin(theta) cos(theta) 0;
0 0 1];
T_z = T;
tensor_order = ndims(C);
el_n = numel(C);
C_tran = C;
C_tran(:) = 0;
iie = zeros(tensor_order,1); % initialise vector with indices of input tensor element
ioe = zeros(tensor_order,1); % initialise vector with indices of output tensor element
cum_vector = cumprod(3*ones(tensor_order,1))/3;
for i = 1:el_n, % loop over all output elements
ioe = mod(floor((i-1)./cum_vector),3)+1; % calculate indices of current output tensor element
for j = 1:el_n, % loop over all input elements
pmxx = 1; % initialise product of transformation matrices
iie = mod(floor((j-1)./cum_vector),3)+1; % calculate indices of current input tensor element
for k = 1:tensor_order % loop over all dimensions
pmxx = pmxx * T_z( ioe(k), iie(k) );
end
C_tran(i) = C_tran(i) + pmxx * C(j); % add product of transformation matrices and input tensor element to output tensor element
end
end
回答（1 个）
per isakson
2021-2-25
编辑：per isakson
2021-2-25
0 个投票
2 个评论
Mark Sc
2021-2-25
per isakson
2021-2-26
编辑：per isakson
2021-2-26
"but it's very slow" Do you mean more than one millisecond? What is an acceptable execution time?
"specially converting sum functions into a for loop" The function, sum(), doesn't appear in your code.
类别
在 帮助中心 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息
2021-2-26
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
