Cody

# Problem 413. Back to basics 23 - Triangular matrix

Solution 1586451

Submitted on 18 Jul 2018
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### Test Suite

Test Status Code Input and Output
1   Fail
x = ones(4,4); y_correct = [1 0 0 0; 1 1 0 0; 1 1 1 0; 1 1 1 1]; assert(isequal(triangle(x),y_correct))

y = 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 z = 1 2 3 4 y = 1 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1

Unable to perform assignment because the size of the left side is 1-by-2 and the size of the right side is 1-by-3. Error in triangle (line 6) y(i,i+1:end) = zeros(1,length(x)-1) Error in Test1 (line 3) assert(isequal(triangle(x),y_correct))

2   Fail
x = ones(5,5); y_correct = [1 0 0 0 0; 1 1 0 0 0; 1 1 1 0 0; 1 1 1 1 0; 1 1 1 1 1]; assert(isequal(triangle(x),y_correct))

y = 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 z = 1 2 3 4 5 y = 1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Unable to perform assignment because the size of the left side is 1-by-3 and the size of the right side is 1-by-4. Error in triangle (line 6) y(i,i+1:end) = zeros(1,length(x)-1) Error in Test2 (line 3) assert(isequal(triangle(x),y_correct))

3   Fail
x = reshape(1:16,[4,4]); y_correct = [1 2 3 4; 0 6 7 8; 0 0 11 12; 0 0 0 16]'; assert(isequal(triangle(x),y_correct))

y = 1 5 9 13 2 6 10 14 3 7 11 15 4 8 12 16 z = 1 2 3 4 y = 1 0 0 0 2 6 10 14 3 7 11 15 4 8 12 16

Unable to perform assignment because the size of the left side is 1-by-2 and the size of the right side is 1-by-3. Error in triangle (line 6) y(i,i+1:end) = zeros(1,length(x)-1) Error in Test3 (line 3) assert(isequal(triangle(x),y_correct))

4   Fail
x = [0 1 2 3; 0 0 1 2; 0 0 0 1; 0 0 0 0]; y_correct = zeros(4); assert(isequal(triangle(x),y_correct))

y = 0 1 2 3 0 0 1 2 0 0 0 1 0 0 0 0 z = 1 2 3 4 y = 0 0 0 0 0 0 1 2 0 0 0 1 0 0 0 0

Unable to perform assignment because the size of the left side is 1-by-2 and the size of the right side is 1-by-3. Error in triangle (line 6) y(i,i+1:end) = zeros(1,length(x)-1) Error in Test4 (line 3) assert(isequal(triangle(x),y_correct))