Module « scipy.linalg »

Fonction tri - module scipy.linalg

Signature de la fonction tri

def tri(N, M=None, k=0, dtype=None) 

Description

tri.__doc__

    Construct (N, M) matrix filled with ones at and below the kth diagonal.

    The matrix has A[i,j] == 1 for i <= j + k

    Parameters
    ----------
    N : int
        The size of the first dimension of the matrix.
    M : int or None, optional
        The size of the second dimension of the matrix. If `M` is None,
        `M = N` is assumed.
    k : int, optional
        Number of subdiagonal below which matrix is filled with ones.
        `k` = 0 is the main diagonal, `k` < 0 subdiagonal and `k` > 0
        superdiagonal.
    dtype : dtype, 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]])