is.triu | R Documentation |
Determine if a matrix is upper triangular.
is.triu(x)
x |
A matrix. |
Logical indicating whether the given matrix is lower triangular.
m <- mat("1, -1, -1, -1; 0, 1, -2, -2; 0, 0, 1, -3; 0, 0, 0, 1")
is.triu(m)
is.triu(eye(3, 5))
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