How do I compare to matrices with each other?
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Hi Everyone,
I have two different matrices with diffrent sizes. for example one of them is 1000*3 and the other one is 5000*3.
How can I select/compare the line (I mean 1000 rows of these 5000 rows will be the same in these two matrices) and keep it in another matrice?
box1=cut2d(:,2:4);
box2=rombohedral(:,1:3);
if box1==box2
rombohedral2d=rombohedral;
end
The if part is not working.
2 个评论
Ridwan Alam
2019-11-21
So ... box1 is 1000x3 and box2 is 5000x3?
When you said "1000 rows of these 5000 rows will be the same in these two matrices", did you mean "consecutive" rows?
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Ridwan Alam
2019-11-21
box1=cut2d(:,2:4);
box2=rombohedral(:,1:3);
[index1,index2] = ismember(box1,box2,'rows');
% index2 holds the indices of the rows that are also in box1
rombohedral2d=rombohedral(index2,:); % I assume you want all the columns, not only 3, right?
% if you want only those 3 columns, use:
% rombohedral2d=rombohedral(index2,1:3);
更多回答(1 个)
Erivelton Gualter
2019-11-21
If I understood right, you want to compare the first 1000 rows of these two matrix.
% Sample Matrix
A = rand(1000, 3);
B = rand(5000, 3);
% C contains 0 and 1 as a results of comparing A and B. Since A and B were rand created,
% matrix C will probably contains only zeros (1000x3)
C = A == B(1:1000,:)
% As a example, lets chage the first rows for each matrix:
A(1,:) = [0 1 2];
B(1,:) = [0 1 5]
C = A == B(1:1000,:)
% The result will be
% C = [1 1 0;
% 0 0 0 .....
It may be not what you want, but can give you some insigth.
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