Save multiple 2d-Arrays with different amount rows in the same 3d-Array

I wat to save differet 2d-Array in one 3d-Array

A =

     1     1     1
     1     1     1
     1     1     1
B =

     2     2     2
     2     2     2
     2     2     2
     2     2     2

Array3d(:,:,1) = A(:,:)
Array3d(:,:,2) = A(:,:)
    

the resault is this message:

Unable to perform assignment because the size of the left side is 3319-by-7 and the size of the right
    side is 1574-by-7.
    

I agree that they are not the same size, but i'm searching for a way how to size up the first (and several previous) "2d-Layers" of the 3d-Array.

For example i want that the Array-"Layer" Array3d(:,:,1) gets tranformed to this

 Array3d(:,:,1) =
     1     1     1
     1     1     1
     1     1     1
     0     0     0
     

I expected a way of self extension like in this case

     >> C(3,2)= 1

C =

     0     0
     0     0
     0     1

I don't have to define the zeros...

Would be very thankfull for any help.

Answer 1

[Ameer Hamza]

In case you know already know which matrix have more rows, you can do something like the following

A; % 3319x7
B; % 1574x7

n = size(A,1);
B(n,:) = 0;

Array3d = cat(3, A, B)

The line B(n,:) = 0; will automatically expand B to have same number of rows as A, and fill the new rows with 0.

[Tammo Mättig-Behrens]

Thank you for the quick response!

That's a way to to it, thank you!

In my specific case the 2d-Arrays get generated and i want to save them in a 3d-Array befor generating the next one.

I will have several 2d-arrays wich are smaler or bigger than the existing "2d-Layer" of the the 3d-array. I hoped that there is a more automatic way to solve problem.

But it works! Thank's again :)

for j=1:nphi
    for i=1:sz(1)
        if (j-1)*phi < wind(i,6) && wind(i,6) < j*phi
            k = k +1;
            windphi2d(k,:) = wind(i,:);
            sz2d = size(windphi2d);   
        end
        
         if sz2d(1) < sz3d(1)               %Größe des 2D-Array anpassen
                windphi2d(sz3d,:)=0;
            elseif sz2d(1) > sz3d(1)
                windphi(sz2d(1),:,l)=0;
         end
    end
     windphi(:,:,l) = windphi2d(:,:);       %2D-Array in 3D-Array einfügen
     sz3d = size(windphi);                  %Größe des 3D-Array erfasse
     l= l+1;                                %Zähler für 3D-Array "Lage" erhöhen
     k=0;                                   %2D-Array Zähler nunnel
     windphi2d(:,:)=0;                      %2D-Array leeren
end

[Ameer Hamza]

So everytime there is a new 2D array larger the the previous arrays, you want to expand the complete 3D array to fit the 2D later?

[Tammo Mättig-Behrens]

Correct! That's the way i wanted to go.

[Ameer Hamza]

Try this

for j=1:nphi
    for i=1:sz(1)
        if (j-1)*phi < wind(i,6) && wind(i,6) < j*phi
            k = k +1;
            windphi2d(k,:) = wind(i,:);
            sz2d = size(windphi2d);
        end
        
        if sz2d(1) < sz3d(1)               %Größe des 2D-Array anpassen
            windphi2d(sz3d,:)=0;
        elseif sz2d(1) > sz3d(1)
            windphi(sz2d(1),:,l)=0;
        end
    end
    
    if size(windphi2d,1) > size(windphi,1)
        n = size(windphi2d,1);
        windphi(n,:,:) = 0;
    elseif size(windphi2d,1) < size(windphi,1)
        n = size(windphi,1);
        windphi2d(n,:) = 0;
    end
    windphi(:,:,l) = windphi2d(:,:);
    
    sz3d = size(windphi);                  %Größe des 3D-Array erfasse
    l= l+1;                                %Zähler für 3D-Array "Lage" erhöhen
    k=0;                                   %2D-Array Zähler nunnel
    windphi2d(:,:)=0;                      %2D-Array leeren
end