Cody

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

Solution 2140748

Submitted on 26 Feb 2020
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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))

Error in solution: Line: 2 Column: 19 Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

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))

Error in solution: Line: 2 Column: 19 Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

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

Error in solution: Line: 2 Column: 19 Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

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))

Error in solution: Line: 2 Column: 19 Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

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))

Error in solution: Line: 2 Column: 19 Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

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))

Error in solution: Line: 2 Column: 19 Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.