Cody

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

Solution 2042143

Submitted on 2 Dec 2019
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### Test Suite

Test Status Code Input and Output
1   Pass
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 3 2 4 1 3 2 4 1 3 2 4 1 3 2 4

2   Pass
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 3 2 4 5 7 6 8 1 3 2 4 5 7 6 8

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

Index in position 2 exceeds array bounds (must not exceed 3). Error in swapmid (line 2) y=x(:,[1 3 2 4]) Error in Test3 (line 3) assert(isequal(swapmid(x),y_correct))

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 = 1 0 0 0 0 0 1 0 0 1 0 0 0 0 0 1 0 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 = 1 3 2 4 2 4 3 5 3 5 4 6

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))

Index in position 2 exceeds array bounds (must not exceed 3). Error in swapmid (line 2) y=x(:,[1 3 2 4]) Error in Test6 (line 3) assert(isequal(swapmid(x),y_correct))