how do i join 2 matrices

Question

Johannes Deelstra 2022-11-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1859703-how-do-i-join-2-matrices

评论： Johannes Deelstra 2022-11-22

采纳的回答： Cris LaPierre

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Cris LaPierre 2022-11-22

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1859703-how-do-i-join-2-matrices#answer_1108468

在 MATLAB Online 中打开

Yes, you could use vertical concatenation followed by reshape.

a= rand(5)
a = 5×5
0173    0.7698    0.9666    0.5950    0.4746
6177    0.5225    0.8442    0.4543    0.3936
6916    0.9324    0.3006    0.4929    0.6506
2824    0.6577    0.2550    0.7117    0.3328
9762    0.9710    0.0704    0.4868    0.8103
b=rand(5)+5
b = 5×5
7310    5.9541    5.6878    5.2669    5.0292
6420    5.3310    5.8203    5.4492    5.9954
5594    5.1451    5.9291    5.2707    5.2556
1165    5.3710    5.5359    5.6458    5.9792
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
0173    5.7310    0.7698    5.9541    0.9666    5.6878
6177    5.6420    0.5225    5.3310    0.8442    5.8203
6916    5.5594    0.9324    5.1451    0.3006    5.9291
2824    5.1165    0.6577    5.3710    0.2550    5.5359
9762    5.6456    0.9710    5.7392    0.0704    5.6668
% using vertical concatenation and reshape
c2 = [a;b]
c2 = 10×5
0173    0.7698    0.9666    0.5950    0.4746
6177    0.5225    0.8442    0.4543    0.3936
6916    0.9324    0.3006    0.4929    0.6506
2824    0.6577    0.2550    0.7117    0.3328
9762    0.9710    0.0704    0.4868    0.8103
7310    5.9541    5.6878    5.2669    5.0292
6420    5.3310    5.8203    5.4492    5.9954
5594    5.1451    5.9291    5.2707    5.2556
1165    5.3710    5.5359    5.6458    5.9792
6456    5.7392    5.6668    5.4423    5.0321
c2 = reshape(c2,size(a,1),[])
c2 = 5×10
0173    5.7310    0.7698    5.9541    0.9666    5.6878    0.5950    5.2669    0.4746    5.0292
6177    5.6420    0.5225    5.3310    0.8442    5.8203    0.4543    5.4492    0.3936    5.9954
6916    5.5594    0.9324    5.1451    0.3006    5.9291    0.4929    5.2707    0.6506    5.2556
2824    5.1165    0.6577    5.3710    0.2550    5.5359    0.7117    5.6458    0.3328    5.9792
9762    5.6456    0.9710    5.7392    0.0704    5.6668    0.4868    5.4423    0.8103    5.0321