# jax.numpy.tril¶

jax.numpy.tril(m, k=0)[source]

Lower triangle of an array.

LAX-backend implementation of tril(). Original docstring below.

Return a copy of an array with elements above the k-th diagonal zeroed.

Parameters
• m (array_like, shape (M, N)) – Input array.

• k (int, optional) – Diagonal above which to zero elements. k = 0 (the default) is the main diagonal, k < 0 is below it and k > 0 is above.

Returns

tril – Lower triangle of m, of same shape and data-type as m.

Return type

ndarray, shape (M, N)

triu()

same thing, only for the upper triangle

Examples

>>> np.tril([[1,2,3],[4,5,6],[7,8,9],[10,11,12]], -1)
array([[ 0,  0,  0],
[ 4,  0,  0],
[ 7,  8,  0],
[10, 11, 12]])