# tril¶

sparse.tril(x, k=0)[source]

Returns an array with all elements above the k-th diagonal set to zero.

Parameters
• x (COO) – The input array.

• k (int, optional) – The diagonal above which elements are set to zero. The default is zero, which corresponds to the main diagonal.

Returns

The output lower-triangular matrix.

Return type

COO

Raises

ValueError – If x doesn’t have zero fill-values.

numpy.tril()