load function not returning correct array dimension

So I want to save() a bunch of array in another file so i can acces it later using load(). When i want to use the array(12x18), i got error message, "error: reshape: can't reshape 1x1 array to 6x3 array". Below is an example of how my code is. How do properly store and access the matrix ? I use a lot of reshape in my code.

a = randi(12,12,18);

save('a.mat','a');

b = load('a.mat','a')

c = reshape(b(1,:),[6,3])

[Johan]

load puts your saved data in a structure, use b.a to access your data

a = randi(12,12,18);
save('a.mat','a');
b = load('a.mat','a')

b = struct with fields:
    a: [12×18 double]

c = reshape(b.a(1,:),[6,3])

c = 6×3

6 11 10 8 10 11 9 4 2 11 10 3 8 6 8 3 7 12

[Muhammad Safwan Razif]

Thank you very much sir. That solved my problem :)