How Zero padding inside a matrix ?

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So
So 2016-5-17
评论： Star Strider 2016-5-17
Hello, how can i zero pad inside a matrix ? For example :
if true
% code
end
A = [ 1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16]
And i want
A = [ 1 2 3 4
5 6 7 8
0 0 0 0
0 0 0 0
......
0 0 0 0
0 0 0 0
9 10 11 12
13 14 15 16]
I know padarray can zero pad but only outside not in the inside.. Thank you.

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Star Strider
Star Strider 2016-5-17
Create a second matrix of zeros, then assign the appropriate rows of your first matrix to the rows you want in the second matrix:
A = [ 1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16];
Desired_Rows = 10; % Pick A Number
B = zeros(Desired_Rows, size(A,2));
B([1:2 end-1:end],:) = A
B =
1 2 3 4
5 6 7 8
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
9 10 11 12
13 14 15 16
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Guillaume
Guillaume 2016-5-17
In my opinion, it'd be simpler to split the original matrix and insert a zero matrix in between: B = [A(1:10, :); zeros(40, size(A, 2); A(11:20, :)]
Star Strider
Star Strider 2016-5-17
I thought about that, but considered that this could be a ‘proxy problem’ and the rows could end up being inserted anywhere in the target matrix, not just at the ends. The approach I took allows for that more easily.

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