scipy.linalg.tri#
- scipy.linalg.tri(N, M=None, k=0, dtype=None)[source]#
Construct (N, M) matrix filled with ones at and below the kth diagonal.
The matrix has A[i,j] == 1 for j <= i + k
- Parameters
- Nint
The size of the first dimension of the matrix.
- Mint or None, optional
The size of the second dimension of the matrix. If M is None, M = N is assumed.
- kint, optional
Number of subdiagonal below which matrix is filled with ones. k = 0 is the main diagonal, k < 0 subdiagonal and k > 0 superdiagonal.
- dtypedtype, optional
Data type of the matrix.
- Returns
- tri(N, M) ndarray
Tri matrix.
Examples
>>> from scipy.linalg import tri >>> tri(3, 5, 2, dtype=int) array([[1, 1, 1, 0, 0], [1, 1, 1, 1, 0], [1, 1, 1, 1, 1]]) >>> tri(3, 5, -1, dtype=int) array([[0, 0, 0, 0, 0], [1, 0, 0, 0, 0], [1, 1, 0, 0, 0]])