Repeat rows in a matrix

Hello, I have a 7832x20 matrix(A) and and I would like to create another identical sized matrix(B) where the first 22 rows of B are equal to the first row of A, the 23rd up to the 44th row of B to be equal to the 23rd row of A...rows 45 to 66 of B equal to row 45 and ,I think you got the point,until the last row. I have tried the following code but I get a dimension mismatch error

for mm=1:22:7832
    B(mm,:) = padarray(A(mm,:),[21],'replicate','post')
end

Is there anotherway to do it? Am I completely off? I thank you in advance for your help

Answer 1

[Guillaume]

B = repelem(A(1:22:end, :), 22, 1);

is all that is needed. repelem was introduced in R2015a.

[Tommaso Fornaciari]

worked! thank you. cheers

[Image Analyst]

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Answer 2

[Honglei Chen]

B = kron(A(1:22:end,:),ones(22,1))

Answer 3

[Changoleon]

Hi, I got really really close to the answer. You just need to add 2 or 3 lines of code to finish it.

A = [ 1 2; 3 4; 5 6; 7 8; 9 10; 11 12; 13 14; 15 16; 17 18; 19 20];

d=2;

for i = 1:2:10

    B(i,:) = A(i,:);

    for j=1:1:9
        if B(j,1)==0 

           B(j,:) = B(j-1,:);
        end
    end
end