numpy.triu#

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

Upper triangle of an array.

Return a copy of an array with the elements below thek-th diagonalzeroed. For arrays withndim exceeding 2,triu will apply to thefinal two axes.

Please refer to the documentation fortril for further details.

See also

tril

lower triangle of an array

Examples

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>>>importnumpyasnp>>>np.triu([[1,2,3],[4,5,6],[7,8,9],[10,11,12]],-1)array([[ 1,  2,  3],       [ 4,  5,  6],       [ 0,  8,  9],       [ 0,  0, 12]])

>>>np.triu(np.arange(3*4*5).reshape(3,4,5))array([[[ 0,  1,  2,  3,  4],        [ 0,  6,  7,  8,  9],        [ 0,  0, 12, 13, 14],        [ 0,  0,  0, 18, 19]],       [[20, 21, 22, 23, 24],        [ 0, 26, 27, 28, 29],        [ 0,  0, 32, 33, 34],        [ 0,  0,  0, 38, 39]],       [[40, 41, 42, 43, 44],        [ 0, 46, 47, 48, 49],        [ 0,  0, 52, 53, 54],        [ 0,  0,  0, 58, 59]]])

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