Cody

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

Solution 2015457

Submitted on 12 Nov 2019 at 10:26
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### Test Suite

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))

b1 = 2 2 2 2 b2 = 3 3 3 3 a = 1 3 3 4 1 3 3 4 1 3 3 4 1 3 3 4 a = 1 3 2 4 1 3 2 4 1 3 2 4 1 3 2 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))

b1 = 2 6 2 6 b2 = 3 7 3 7 a = 1 3 3 4 5 7 7 8 1 3 3 4 5 7 7 8 a = 1 3 2 4 5 7 6 8 1 3 2 4 5 7 6 8

Assertion failed.

3   Fail
x = ones(5,3); y_correct = x; assert(isequal(swapmid(x),y_correct))

b1 = 1 1 1 1 1 b2 = 1 1 1 1 1 a = 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 a = 1 1 1 1 1 1 1 1 1 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))

b1 = 0 1 0 0 0 b2 = 0 0 1 0 0 a = 1 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0 0 0 0 0 1 a = 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

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))

b1 = 2 3 4 b2 = 3 4 5 a = 1 3 3 4 5 6 7 2 4 4 5 6 7 8 3 5 5 6 7 8 9 a = 1 3 2 4 5 6 7 2 4 3 5 6 7 8 3 5 4 6 7 8 9

Assertion failed.

6   Fail
x = [ones(10,1),zeros(10,1),5*ones(10,1)]; y_correct = [ones(10,1),5*ones(10,1),zeros(10,1)]; assert(isequal(swapmid(x),y_correct))

b1 = 0 0 0 0 0 0 0 0 0 0 b2 = 5 5 5 5 5 5 5 5 5 5 a = 1 5 5 1 5 5 1 5 5 1 5 5 1 5 5 1 5 5 1 5 5 1 5 5 1 5 5 1 5 5 a = 1 5 0 1 5 0 1 5 0 1 5 0 1 5 0 1 5 0 1 5 0 1 5 0 1 5 0 1 5 0

Assertion failed.