numpy.tril
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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: -
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 andk > 0
is above.
Returns: -
tril : ndarray, shape (M, N)
-
Lower triangle of
m
, of same shape and data-type asm
.
See also
-
triu
- same thing, only for the upper triangle
Examples
>>> 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]])
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Licensed under the 3-clause BSD License.
https://docs.scipy.org/doc/numpy-1.15.4/reference/generated/numpy.tril.html