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tril

Lower triangular part of matrix

Syntax

L = tril(X)
L = tril(X,k)

Description

L = tril(X) returns the lower triangular part of X.

L = tril(X,k) returns the elements on and below 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

tril(ones(4,4),-1)

ans =

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

See Also

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Introduced before R2006a

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