tril(m, k=0)
Return a copy of an array with elements above the k
-th diagonal zeroed. For arrays with ndim
exceeding 2, tril
will apply to the final two axes.
Input array.
Diagonal above which to zero elements. :None:None:`k = 0`
(the default) is the main diagonal, :None:None:`k < 0`
is below it and :None:None:`k > 0`
is above.
Lower triangle of an array.
triu
same thing, only for the upper triangle
>>> 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]])
>>> np.tril(np.arange(3*4*5).reshape(3, 4, 5)) array([[[ 0, 0, 0, 0, 0], [ 5, 6, 0, 0, 0], [10, 11, 12, 0, 0], [15, 16, 17, 18, 0]], [[20, 0, 0, 0, 0], [25, 26, 0, 0, 0], [30, 31, 32, 0, 0], [35, 36, 37, 38, 0]], [[40, 0, 0, 0, 0], [45, 46, 0, 0, 0], [50, 51, 52, 0, 0], [55, 56, 57, 58, 0]]])See :
The following pages refer to to this document either explicitly or contain code examples using this.
dask.array.routines.tril
numpy.diag
numpy.tril_indices_from
numpy.triu
numpy.mask_indices
numpy.tril
numpy.tril_indices
scipy.linalg._decomp_lu.lu_factor
numpy.triu_indices
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