How to add a constant value above a matrix in following code?

2022 11 7
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更新时间：2022 11 7
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Hello
P is a matrix of 100 106 and I am trying to add 20 constant values (say 0.25) above each row and 20 constant values (say 0.21) below each rows to make P as 140 106. How I can change following code? instead of taking first value of each column (P(1,:)), how I can replace with a constant value?
A_pad = zeros(140,106);
A_pad(1:20,:) = ones(20,1)*P(1,:);
A_pad(21:120,:) = P;
A_pad(121:140,:) = ones(20,1)*P(end,:);

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Steven Lord
Steven Lord 2022-11-7
Ran in:

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Ran in:
A = magic(4)
A = 4×4
16 2 3 13 5 11 10 8 9 7 6 12 4 14 15 1
B = [repmat(-999, 2, width(A));
A;
repmat(Inf, 3, width(A))]
B = 9×4
-999 -999 -999 -999 -999 -999 -999 -999 16 2 3 13 5 11 10 8 9 7 6 12 4 14 15 1 Inf Inf Inf Inf Inf Inf Inf Inf Inf Inf Inf Inf
This pads 2 rows containing the constant -999 above the matrix A and 3 rows containing the constant Inf below.

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