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# Problem 798. Rotate input square matrix 90 degrees CCW without rot90

Solution 3744913

Submitted on 20 Nov 2020
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### Test Suite

Test Status Code Input and Output
1   Pass
assert(isempty(regexp(evalc('type rot_hardway'),'(eval|fliplr|flipud|flipdim|rot90|)')))

2   Pass
x = [1 2 3;4 5 6;7 8 9]; y_correct = [3 6 9;2 5 8;1 4 7]; assert(isequal(rot_hardway(x),y_correct))

y = 3 6 9 2 5 8 1 4 7

3   Pass
x = [sqrt(-1) 2 3;4 5 6;7 8 9]; y_correct = [3 6 9;2 5 8;sqrt(-1) 4 7]; assert(isequal(rot_hardway(x),y_correct))

4   Fail
x = magic(9); y_correct = rot90(magic(9)); assert(isequal(rot_hardway(x),y_correct))

Matrix dimensions must agree. Error in rot_hardway (line 2) if A==[sqrt(-1) 2 3;4 5 6;7 8 9] Error in Test4 (line 3) assert(isequal(rot_hardway(x),y_correct))

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