how do i join 2 matrices

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

Answer 1

[Cris LaPierre]

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

[Johannes Deelstra]

perfecto, thanks very much