Rfast2: is.lower.tri – R documentation

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is.lower.tri

Check if a matrix is Lower or Upper triangular

Lower/upper triangular matrix.

is.lower.tri(x, diag = FALSE)
is.upper.tri(x, diag = FALSE)

`x`	A matrix with data.
`diag`	A logical value include the diagonal to the result.

Check if a matrix is lower or upper triangular. You can also include diagonal to the check.

Manos Papadakis

R implementation and documentation: Manos Papadakis <papadakm95@gmail.com>.

x <- matrix(runif(10*10),10,10)

is.lower.tri(x)
is.lower.tri(x,TRUE)


is.upper.tri(x)
is.upper.tri(x,TRUE)

A Collection of Efficient and Extremely Fast R Functions II

v0.0.9

GPL (>= 2.0)

Authors

Manos Papadakis, Michail Tsagris, Stefanos Fafalios and Marios Dimitriadis.

Initial release

2021-03-21