Cody

# Problem 67. Find common elements in matrix rows

Solution 1988687

Submitted on 24 Oct 2019 by Robin French
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### Test Suite

Test Status Code Input and Output
1   Pass
x = []; y_correct = []; assert(isequal(common_by_row(x),y_correct))

y = []

2   Pass
x = [1e100; 1e100]; y_correct = [1e100]; assert(isequal(common_by_row(x),y_correct))

y = [] ref = 1.0000e+100 cmp = 1.0000e+100 r = 1 c = 1 cmpAsCell = 1×1 cell array {[1.0000e+100]} tf = logical 1 idx = logical 1 y = 1.0000e+100

3   Pass
x = [1; 2]; y_correct = []; assert(isequal(common_by_row(x),y_correct))

y = [] ref = 1 cmp = 2 r = 1 c = 1 cmpAsCell = 1×1 cell array {[2]} tf = logical 0 idx = logical 0

4   Pass
x = ones(10); y_correct = [1]; assert(isequal(common_by_row(x),y_correct))

y = [] ref = 1 1 1 1 1 1 1 1 1 1 cmp = 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 r = 9 c = 10 cmpAsCell = 9×1 cell array {1×10 double} {1×10 double} {1×10 double} {1×10 double} {1×10 double} {1×10 double} {1×10 double} {1×10 double} {1×10 double} tf = 9×10 logical array 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 idx = 1×10 logical array 1 1 1 1 1 1 1 1 1 1 y = 1

5   Pass
x = magic(10); y_correct = []; assert(isequal(common_by_row(x),y_correct))

y = [] ref = 92 99 1 8 15 67 74 51 58 40 cmp = 98 80 7 14 16 73 55 57 64 41 4 81 88 20 22 54 56 63 70 47 85 87 19 21 3 60 62 69 71 28 86 93 25 2 9 61 68 75 52 34 17 24 76 83 90 42 49 26 33 65 23 5 82 89 91 48 30 32 39 66 79 6 13 95 97 29 31 38 45 72 10 12 94 96 78 35 37 44 46 53 11 18 100 77 84 36 43 50 27 59 r = 9 c = 10 cmpAsCell = 9×1 cell array {1×10 double} {1×10 double} {1×10 double} {1×10 double} {1×10 double} {1×10 double} {1×10 double} {1×10 double} {1×10 double} tf = 9×10 logical array 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 idx = 1×10 logical array 0 0 0 0 0 0 0 0 0 0

6   Pass
x = wilkinson(9); y_correct = [0 1]; assert(isequal(common_by_row(x),y_correct))

y = [] ref = 4 1 0 0 0 0 0 0 0 cmp = 1 3 1 0 0 0 0 0 0 0 1 2 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 1 2 1 0 0 0 0 0 0 0 1 3 1 0 0 0 0 0 0 0 1 4 r = 8 c = 9 cmpAsCell = 8×1 cell array {1×9 double} {1×9 double} {1×9 double} {1×9 double} {1×9 double} {1×9 double} {1×9 double} {1×9 double} tf = 8×9 logical array 0 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 idx = 1×9 logical array 0 1 1 1 1 1 1 1 1 y = 0 1

7   Pass
x = [3 -2 1 NaN; NaN 0 -2 3]; y_correct = [-2 3]; assert(isequal(common_by_row(x),y_correct))

y = [] ref = 3 -2 1 NaN cmp = NaN 0 -2 3 r = 1 c = 4 cmpAsCell = 1×1 cell array {1×4 double} tf = 1×4 logical array 1 1 0 0 idx = 1×4 logical array 1 1 0 0 y = -2 3