| MATLAB® | ![]() |
U = triu(X)
U = triu(X,k)
U = triu(X) returns the upper triangular part of X.
U = triu(X,k) returns the element on and above the kth diagonal of X. k = 0 is the main diagonal, k > 0 is above the main diagonal, and k < 0 is below the main diagonal.

triu(ones(4,4),-1)
ans =
1 1 1 1
1 1 1 1
0 1 1 1
0 0 1 1![]() | trisurf | true | ![]() |

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