How to to add column 3rd+4th, 6th+7th and 9th+10th from a 8x12 matrix?

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Amdad Chowdury
Amdad Chowdury 2022-11-29
回答： Jan 2022-11-29
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I want to add column 3rd+4th, 6th+7th and 9th+10th from the matrix B. I want to apply the rule for a 2D sparse matrix.
A = [1,2,3;4,5,6]
A = 2×3
1 2 3 4 5 6
N=4;
B = kron(eye(N),A)
B = 8×12
1 2 3 0 0 0 0 0 0 0 0 0 4 5 6 0 0 0 0 0 0 0 0 0 0 0 0 1 2 3 0 0 0 0 0 0 0 0 0 4 5 6 0 0 0 0 0 0 0 0 0 0 0 0 1 2 3 0 0 0 0 0 0 0 0 0 4 5 6 0 0 0 0 0 0 0 0 0 0 0 0 1 2 3 0 0 0 0 0 0 0 0 0 4 5 6

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回答（1 个）

Jan
Jan 2022-11-29
C1 = B(:, 3) + B(:, 4);
C2 = B(:, 6) + B(:, 7);
C3 = B(:, 9) + B(:, 10);
Or maybe:
C = B(:, [3,6,9]) + B(:, [4,7,10])

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