Converting matirx into vektor inside a cell array
显示 更早的评论
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
采纳的回答
Alex Mcaulley
2020-2-20
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
更多回答（1 个）
the cyclist
2020-2-20
ev1 = cellfun(@(x)x(:,1),V,'UniformOutput',false);
ev2 = cellfun(@(x)x(:,2),V,'UniformOutput',false);
6 个评论
Antonio Sarusic
2020-2-20
the cyclist
2020-2-20
That's odd. It worked for a test array that mimicked what you described.
If you want to upload your cell array V, I could poke around. But at least you have a solution.
Antonio Sarusic
2020-2-20
the cyclist
2020-2-20
Sorry, I don't have the Image Processing Toolbox, so I think we are at an impasse. :-/
the cyclist
2020-2-20
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.
Antonio Sarusic
2020-2-20
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