Cody

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

Solution 2044096

Submitted on 3 Dec 2019 by Dan Siboni
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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))

w = 3 2 1 6 5 4 9 8 7 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))

w = 3.0000 + 0.0000i 2.0000 + 0.0000i 0.0000 + 1.0000i 6.0000 + 0.0000i 5.0000 + 0.0000i 4.0000 + 0.0000i 9.0000 + 0.0000i 8.0000 + 0.0000i 7.0000 + 0.0000i y = 3.0000 + 0.0000i 6.0000 + 0.0000i 9.0000 + 0.0000i 2.0000 + 0.0000i 5.0000 + 0.0000i 8.0000 + 0.0000i 0.0000 + 1.0000i 4.0000 + 0.0000i 7.0000 + 0.0000i

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

w = 45 34 23 12 1 80 69 58 47 46 44 33 22 11 9 79 68 57 56 54 43 32 21 10 8 78 67 66 55 53 42 31 20 18 7 77 76 65 63 52 41 30 19 17 6 5 75 64 62 51 40 29 27 16 15 4 74 72 61 50 39 28 26 25 14 3 73 71 60 49 38 36 35 24 13 2 81 70 59 48 37 y = 45 46 56 66 76 5 15 25 35 34 44 54 55 65 75 4 14 24 23 33 43 53 63 64 74 3 13 12 22 32 42 52 62 72 73 2 1 11 21 31 41 51 61 71 81 80 9 10 20 30 40 50 60 70 69 79 8 18 19 29 39 49 59 58 68 78 7 17 27 28 38 48 47 57 67 77 6 16 26 36 37