numpy.tril()

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

Lower triangle of an array.

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

Parameters:

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 : ndarray, shape (M, N) Lower triangle of `m`, of same shape and data-type as `m`.

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 : ndarray, shape (M, N)

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

>>> 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]])

Links:

doc_NumPy

2017-01-10 18:19:03

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