flip2D: Flip a 2D matrix.
Description
Flip a 2D matrix.
Usage
flip2D(slice, how = "horizontally")
Arguments
how
character string, one of 'vertically' or 'horizontally'. Note that flipping *horizontally* means that the image will be mirrored along the central *vertical* axis. If `NULL` is passed, the passed value is returned unaltered.
Value
2D matrix, the flipped matrix.