# how do i join 2 matrices

조회 수: 1(최근 30일)
Johannes Deelstra 2022년 11월 22일
댓글: Johannes Deelstra 2022년 11월 22일
I have 2 matrices a and b, both having size 5 x 5
I want to combine these 2 in a new matrix c, such that c = [a(:,1) b(:,1) a(:,2) b(:,2) a(:,3) b(:,3) etc];
Is this the only way doing it or is there another way?
Thanks
Johannes

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### 채택된 답변

Cris LaPierre 2022년 11월 22일
Yes, you could use vertical concatenation followed by reshape.
a= rand(5)
a = 5×5
0.0173 0.7698 0.9666 0.5950 0.4746 0.6177 0.5225 0.8442 0.4543 0.3936 0.6916 0.9324 0.3006 0.4929 0.6506 0.2824 0.6577 0.2550 0.7117 0.3328 0.9762 0.9710 0.0704 0.4868 0.8103
b=rand(5)+5
b = 5×5
5.7310 5.9541 5.6878 5.2669 5.0292 5.6420 5.3310 5.8203 5.4492 5.9954 5.5594 5.1451 5.9291 5.2707 5.2556 5.1165 5.3710 5.5359 5.6458 5.9792 5.6456 5.7392 5.6668 5.4423 5.0321
% brute force
c = [a(:,1) b(:,1) a(:,2) b(:,2) a(:,3) b(:,3)]
c = 5×6
0.0173 5.7310 0.7698 5.9541 0.9666 5.6878 0.6177 5.6420 0.5225 5.3310 0.8442 5.8203 0.6916 5.5594 0.9324 5.1451 0.3006 5.9291 0.2824 5.1165 0.6577 5.3710 0.2550 5.5359 0.9762 5.6456 0.9710 5.7392 0.0704 5.6668
% using vertical concatenation and reshape
c2 = [a;b]
c2 = 10×5
0.0173 0.7698 0.9666 0.5950 0.4746 0.6177 0.5225 0.8442 0.4543 0.3936 0.6916 0.9324 0.3006 0.4929 0.6506 0.2824 0.6577 0.2550 0.7117 0.3328 0.9762 0.9710 0.0704 0.4868 0.8103 5.7310 5.9541 5.6878 5.2669 5.0292 5.6420 5.3310 5.8203 5.4492 5.9954 5.5594 5.1451 5.9291 5.2707 5.2556 5.1165 5.3710 5.5359 5.6458 5.9792 5.6456 5.7392 5.6668 5.4423 5.0321
c2 = reshape(c2,size(a,1),[])
c2 = 5×10
0.0173 5.7310 0.7698 5.9541 0.9666 5.6878 0.5950 5.2669 0.4746 5.0292 0.6177 5.6420 0.5225 5.3310 0.8442 5.8203 0.4543 5.4492 0.3936 5.9954 0.6916 5.5594 0.9324 5.1451 0.3006 5.9291 0.4929 5.2707 0.6506 5.2556 0.2824 5.1165 0.6577 5.3710 0.2550 5.5359 0.7117 5.6458 0.3328 5.9792 0.9762 5.6456 0.9710 5.7392 0.0704 5.6668 0.4868 5.4423 0.8103 5.0321
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Johannes Deelstra 2022년 11월 22일
perfecto, thanks very much

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