Cody

Problem 2813. Create a block diagonal matrix

Solution 2338558

Submitted on 22 May 2020 by Jiawei Gong
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Test Suite

Test Status Code Input and Output
1   Pass
a = [1 2 3]; n = 3; A_correct = [1 2 3 0 0 0 0 0 0; 0 0 0 1 2 3 0 0 0; 0 0 0 0 0 0 1 2 3]; assert(isequal(block_diagonal(a,n),A_correct))

ans = 1 2 3 0 0 0 0 0 0 0 0 0 1 2 3 0 0 0 0 0 0 0 0 0 1 2 3

2   Pass
a = []; n = 3; A_correct = []; assert(isequal(block_diagonal(a,n),A_correct))

ans = []

3   Pass
a = [1 2 -3]'; n = 0; A_correct = []; assert(isequal(block_diagonal(a,n),A_correct))

ans = []

4   Pass
a = [3 -2]'; n = 4; A_correct = [3 -2 0 0 0 0 0 0; 0 0 3 -2 0 0 0 0; 0 0 0 0 3 -2 0 0; 0 0 0 0 0 0 3 -2]'; assert(isequal(block_diagonal(a,n),A_correct))

ans = 3 0 0 0 -2 0 0 0 0 3 0 0 0 -2 0 0 0 0 3 0 0 0 -2 0 0 0 0 3 0 0 0 -2

5   Pass
a = 6; n = 23; A_correct = a*eye(n); assert(isequal(block_diagonal(a,n),A_correct))

ans = 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6

6   Pass
a = magic(5); n = 2; A_correct = [a zeros(5); zeros(5) a]; assert(isequal(block_diagonal(a,n),A_correct))

ans = 17 24 1 8 15 0 0 0 0 0 23 5 7 14 16 0 0 0 0 0 4 6 13 20 22 0 0 0 0 0 10 12 19 21 3 0 0 0 0 0 11 18 25 2 9 0 0 0 0 0 0 0 0 0 0 17 24 1 8 15 0 0 0 0 0 23 5 7 14 16 0 0 0 0 0 4 6 13 20 22 0 0 0 0 0 10 12 19 21 3 0 0 0 0 0 11 18 25 2 9

7   Pass
a = randi(100,13,8); n = 1; A_correct = a; assert(isequal(block_diagonal(a,n),A_correct))

ans = 72 15 1 89 98 69 70 51 4 98 11 3 72 69 35 17 79 82 89 36 32 53 37 9 43 41 1 92 54 3 32 58 47 9 42 19 76 67 3 32 51 14 44 62 11 29 3 21 35 81 31 21 86 55 7 40 61 55 78 12 66 85 99 6 30 45 29 62 32 17 72 43 18 34 54 6 78 60 51 95 71 50 67 68 32 43 11 92 66 97 67 10 99 15 6 25 31 73 4 22 3 54 10 50

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