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# Problem 42695. Replace secondary diagonal elements of a square array

Solution 1523998

Submitted on 9 May 2018 by Sandro Flury
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### Test Suite

Test Status Code Input and Output
1   Pass
A = [1 2 3; 4 5 6; 7 8 9]; n = 10; B_correct = [1 2 10; 4 10 6; 10 8 9]; assert(isequal(sec_diag_replacement(A,n),B_correct))

l = 3 col = 1 2 3 1 2 3 1 2 3 row = 1 1 1 2 2 2 3 3 3

2   Pass
A = 1; n = 10; B_correct = 10; assert(isequal(sec_diag_replacement(A,n),B_correct))

l = 1 col = 1 row = 1

3   Pass
A = ones(4); n = 0; B_correct = [1 1 1 0; 1 1 0 1; 1 0 1 1; 0 1 1 1]; assert(isequal(sec_diag_replacement(A,n),B_correct))

l = 4 col = 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 row = 1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4

4   Pass
A = eye(4); n = 10; B_correct = [1 0 0 10; 0 1 10 0; 0 10 1 0; 10 0 0 1]; assert(isequal(sec_diag_replacement(A,n),B_correct))

l = 4 col = 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 row = 1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4

5   Pass
A = [1 1 2 1; 1 2 1 1; 2 1 1 1; 1 1 1 2]; n = 3; B_correct = [1 1 2 3; 1 2 3 1; 2 3 1 1; 3 1 1 2]; assert(isequal(sec_diag_replacement(A,n),B_correct))

l = 4 col = 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 row = 1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4

6   Pass
A = zeros(3); n = -1; B_correct = [0 0 -1; 0 -1 0; -1 0 0]; assert(isequal(sec_diag_replacement(A,n),B_correct))

l = 3 col = 1 2 3 1 2 3 1 2 3 row = 1 1 1 2 2 2 3 3 3

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