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

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Nisar Ahmed
Nisar Ahmed 2022-11-7
回答： Steven Lord 2022-11-7
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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采纳的回答

Torsten
Torsten 2022-11-7
P = [0.25*ones(20,106);P;0.21*ones(20,106)]

更多回答（1 个）

Steven Lord
Steven Lord 2022-11-7
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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