清空筛选条件
清空筛选条件

Column-wise AND operation in all column combinations of two matrices

10 次查看（过去 30 天）
Giorgos Papakonstantinou
回答： Giorgos Papakonstantinou 2014-2-24
Given matrix a of size MxN and matrix b of size MxL I want to get a matrix C of size M x(N*L) which contains the column-wise logical operation AND of all combinations of columns of matrix a and matrix b.
a = [1 0 0
1 0 0
1 0 0
1 0 0
0 1 0
0 1 0
0 1 0
0 1 0
0 0 1
0 0 1
0 0 1
0 0 1];
b= [0 0 1
0 1 0
1 0 0
0 0 1
0 1 0
1 0 0
0 0 1
0 1 0
1 0 0
0 0 1
0 1 0
1 0 0];
C=[];
for ii=1:size(a, 2)
for jj=1:size(b, 2)
C = [C b(:,jj) & a(:,ii)];
end
end
I am searching for an alternative syntax of the above loops. Thank you!

请先登录，再回答此问题。

采纳的回答

Iain
Iain 2014-2-24
This should do it:
C = bsxfun(@and, a, reshape(b,[12,1,3]);
theresult = C(down,column_a,column_b);

更多回答（3 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-2-24
out=reshape(repmat(a,size(b,2),1),size(a,1),[]) & repmat(b,1,size(a,2))
Jos (10584)
Jos (10584) 2014-2-24
% Small example: two logical arrays
A = rand(3,3) > .25
B = rand(2,3) > .25
% general engine
[ib,ia] = ndgrid(1:size(B,1), 1:size(A,1))
C = A(ia(:),:) & B(ib(:),:)
Giorgos Papakonstantinou
Thank you all for your replies!!

类别

在 Help Center 和 File Exchange 中查找有关 Descriptive Statistics 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by