Extract upper triangular part of a matrix

stm_triu() returns the upper triangular part of a matrix, optionally with a specified diagonal offset.

Usage

stm_triu(mat, k = 0)

Arguments

mat

A numeric matrix.

k

An integer indicating the diagonal to be used. Default is 0, which returns the upper triangular part including the main diagonal.

Value

A matrix containing the upper triangular part of mat, with the specified diagonal offset.

Details

This function calls stm_tri_lower_upper() to extract the upper triangular part of the matrix.

See also

stm_tril

Examples

A <- matrix(1:16, nrow = 4, byrow = TRUE)
print(A)
#>      [,1] [,2] [,3] [,4]
#> [1,]    1    2    3    4
#> [2,]    5    6    7    8
#> [3,]    9   10   11   12
#> [4,]   13   14   15   16
stm_triu(A)
#>      [,1] [,2] [,3] [,4]
#> [1,]    1    2    3    4
#> [2,]    0    6    7    8
#> [3,]    0    0   11   12
#> [4,]    0    0    0   16