Triu
triu(input, diagonal=0, out=NULL) -> Tensor
Returns the upper triangular part of a matrix (2-D tensor) or batch of matrices
input, the other elements of the result tensor out are set to 0.
The upper triangular part of the matrix is defined as the elements on and above the diagonal.
The argument diagonal controls which diagonal to consider. If
diagonal = 0, all elements on and above the main diagonal are
retained. A positive value excludes just as many diagonals above the main
diagonal, and similarly a negative value includes just as many diagonals below
the main diagonal. The main diagonal are the set of indices
\(\lbrace (i, i) \rbrace\) for \(i \in [0, \min\{d_{1}, d_{2}\} - 1]\) where
\(d_{1}, d_{2}\) are the dimensions of the matrix.
Examples
if (torch_is_installed()) {
a = torch_randn(c(3, 3))
a
torch_triu(a)
torch_triu(a, diagonal=1)
torch_triu(a, diagonal=-1)
b = torch_randn(c(4, 6))
b
torch_triu(b, diagonal=1)
torch_triu(b, diagonal=-1)
}
#> torch_tensor
#> -0.4660 -0.2273 -0.6166 -1.9900 -0.7221 -0.9500
#> 1.1051 -0.7226 -0.2677 0.6145 -2.1794 0.7118
#> 0.0000 -0.8139 1.0528 -0.1026 1.3411 -0.7295
#> 0.0000 0.0000 0.2327 -0.4739 -0.6007 -0.3636
#> [ CPUFloatType{4,6} ]