How to assemble 3D array from four vectors

We have four vectors of complex numbers.

FF = 1 x N vector, FM = 1 x N vector, MF = 1 x N vector, MM = 1 x N vector

We need a 3D array G = 2 x 2 x N array, and where each page is [FF(n) FM(n); MF(n) MM(n)]

FF = [1+2i 2+2i 3+2i 4+2i 5+2i 6+2i];
FM = [7+2i 8+2i 9+2i 10+2i 11+2i 12+2i];
MF = [13+2i 14+2i 15+2i 16+2i 17+2i 18+2i];
MM = [19+2i 20+2i 21+2i 22+2i 23+2i 24+2i];
G = [FF(1) FM(1); MF(1) MM(1)];
for n = 2:6
    G(:,:,n) = [FF(n) FM(n); MF(n) MM(n)];
end
G

We tried to assemble it with a reshape function after taking noncongugate transpose.

R = reshape([FF.' MF.'; FM.' MM.'].',2,2,[])

The result is the correct shape of 3D array, and yet it seems that the elements are mixed up.

Is there a better way to assemble this 3D array, other than adding a page at a time in a loop?

Answer 1

[the cyclist]

Here is one way:

G = reshape([FF; MF; FM; MM],2,2,6)

[Ranny Meier]

Thank you. Maybe we were close. Need each page arranged as:

G(:,:,1) =

1.0000 + 2.0000i 7.0000 + 2.0000i

13.0000 + 2.0000i 19.0000 + 2.0000i

R = reshape([FF; MF; FM; MM],2,2,6)

R(:,:,1) =

1.0000 + 2.0000i 7.0000 + 2.0000i

13.0000 + 2.0000i 19.0000 + 2.0000i

At first I missed the added semi-colons in your answer. Now I see that it works.

Also your earlier suggestion that we found in the email is arranged as desired.

H = permute(reshape([FF; FM; MF; MM],2,2,6),[2 1 3 4 5 6])

H(:,:,1) =

1.0000 + 2.0000i 7.0000 + 2.0000i

13.0000 + 2.0000i 19.0000 + 2.0000i

I am reading permute description and have yet to see the magic of how a size 1x6 dimorder works on a size 2x2x6 array.

[the cyclist]

I postsed that first solution too fast, which is part of the reason I edited it quickly.

The first solution, which I edited away, should only have been:

H = permute(reshape([FF; FM; MF; MM],2,2,6),[2 1 3])

The other dimensions were stupidity, not magic. :-)

Then I realized that if I swapped FM and MF, then the permutation can be avoided, for a much cleaner solution.

[Ranny Meier]

Definitely not stupid - simply work in progress. Thank you.