Read values along a triangle diagonal

Returns the values along the diag_num-th anti-diagonal of trg, starting from the bottom-left.

Usage

diag_reader(trg, diag_num = nrow(trg))

Arguments

trg

A square numeric matrix (a triangle).

diag_num

Integer - which anti-diagonal to read. Defaults to the main (last) one.

Value

A numeric vector with the values on that diagonal.

Examples

trg <- matrix(1:9, nrow = 3)
diag_reader(trg)
#> [1] 3 5 7
diag_reader(trg, diag_num = 2)
#> [1] 2 4