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triu

Upper triangular part of matrix

Syntax

U = triu(X)
U = triu(X,k)

Description

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.

Examples

triu(ones(4,4),-1)

ans = 

    1    1    1    1
    1    1    1    1
    0    1    1    1
    0    0    1    1

See Also

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