Good for making symmetrical arrowheads
Usage
reflecter(x, add_reflection = TRUE)
Arguments
- x
matrix
- add_reflection
add to x in reverse order
Value
a matrix with y reversed sign and rows in reverse order
Examples
reflecter(diag(c(1,2)))
#> [,1] [,2]
#> [1,] 1 0
#> [2,] 0 2
#> [3,] 0 -2
#> [4,] 1 0
