Problem 1321. Given a 4x4 matrix, swap the two middle columns

Solution 1999664

Submitted on 2 Nov 2019

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Test	Status	Code Input and Output
1	Fail	x = [1 2 3 4;1 2 3 4;1 2 3 4;1 2 3 4]; y_correct = [1 3 2 4;1 3 2 4;1 3 2 4;1 3 2 4]; assert(isequal(swapmid(x),y_correct)) y = 1 2 3 4 1 2 3 4 Assertion failed.
2	Fail	x = [1 2 3 4;5 6 7 8;1 2 3 4;5 6 7 8]; y_correct = [1 3 2 4;5 7 6 8;1 3 2 4;5 7 6 8]; assert(isequal(swapmid(x),y_correct)) y = 1 2 3 4 5 6 7 8 Assertion failed.
3	Fail	x = ones(5,3); y_correct = x; assert(isequal(swapmid(x),y_correct)) y = 1 1 1 1 1 1 Assertion failed.
4	Fail	x = eye(5); y_correct = [1 0 0 0 0; 0 0 1 0 0; 0 1 0 0 0; 0 0 0 1 0; 0 0 0 0 1]; assert(isequal(swapmid(x),y_correct)) y = 0 0 1 0 0 0 1 0 0 0 Assertion failed.
5	Fail	x = [1:7; 2:8; 3:9]; y_correct = [1 3 2 4:7; 2 4 3 5:8; 3 5 4 6:9]; assert(isequal(swapmid(x),y_correct)) y = 3 4 5 6 7 8 9 2 3 4 5 6 7 8 Assertion failed.
6	Fail	x = [ones(10,1),zeros(10,1),5ones(10,1)]; y_correct = [ones(10,1),5ones(10,1),zeros(10,1)]; assert(isequal(swapmid(x),y_correct)) y = 1 0 5 1 0 5 Assertion failed.