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.