Cody

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

Solution 1702600

Submitted on 4 Jan 2019 by Nikolaos Nikolaou
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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))

t1 = 1 1 1 1 t2 = 2 2 2 2 t3 = 3 3 3 3 t4 = 4 4 4 4 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))

t1 = 1 5 1 5 t2 = 2 6 2 6 t3 = 3 7 3 7 t4 = 4 8 4 8 y = 1 3 2 4 5 7 6 8 1 3 2 4 5 7 6 8

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

t1 = 1 1 1 1 1 t2 = 1 1 1 1 1 t3 = 1 1 1 1 1 y = 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

4   Pass
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))

t1 = 1 0 0 0 0 t2 = 0 1 0 0 0 t3 = 0 0 1 0 0 t4 = 0 0 0 1 0 t5 = 0 0 0 0 1 y = 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

5   Pass
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))

t1 = 1 2 3 t2 = 2 3 4 t3 = 3 4 5 t4 = 4 5 6 t5 = 5 6 7 t6 = 6 7 8 t7 = 7 8 9 y = 1 3 2 4 5 6 7 2 4 3 5 6 7 8 3 5 4 6 7 8 9

6   Pass
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))

t1 = 1 1 1 1 1 1 1 1 1 1 t2 = 0 0 0 0 0 0 0 0 0 0 t3 = 5 5 5 5 5 5 5 5 5 5 y = 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

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