Converting matirx into vektor inside a cell array
조회 수: 1 (최근 30일)
이전 댓글 표시
Hello,
I have a cell array V (1024x1280 cells).
In every cell of this cell array I saved a 2x2 matrix.
Now i want to split this matrix into two column vectors and save these vectors in two cell arrays ev1 and ev2.
And all this for the entire cell array V.
I had the following idea:
for i=1:n
for j=1:m
[ev1{j,i}] = V{j,i}(1,1);
[ev2{j,i}] = V{j,i}(1,2);
end
end
But with this I only get single values.
Thanks,
Antonio
댓글 수: 0
채택된 답변
Alex Mcaulley
2020년 2월 20일
Try with this:
for i=1:n
for j=1:m
ev1{j,i} = V{j,i}(:,1);
ev2{j,i} = V{j,i}(:,2);
end
end
추가 답변 (1개)
the cyclist
2020년 2월 20일
ev1 = cellfun(@(x)x(:,1),V,'UniformOutput',false);
ev2 = cellfun(@(x)x(:,2),V,'UniformOutput',false);
댓글 수: 6
the cyclist
2020년 2월 20일
I will say this, though. It looks like you could use 4-dimensional arrays instead of cell arrays.
V = zeros(m,n,2,2);
D = zeros(m,n,2,2);
for i=1:n
for j=1:m
HesseM = [Gxx(j,i) Gxy(j,i); Gyx(j,i) Gyy(j,i)];
[V(j,i,:,:),D(j,i,:,:)] = eig(HesseM);
end
end
Then the next operation is ...
ev1 = V(:,:,:,1);
ev2 = V(:,:,:,2);
and other downstream operations might also be easier, and probably execute faster.
참고 항목
카테고리
Help Center 및 File Exchange에서 Structures에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!