The orientation of coordinates (e.g. is a serve going from the lower part of the court to the upper, or vice-versa?) depends on how the scout entered them. This function finds coordinates that require flipping, so that all attacks/serves/whatever can be plotted with the same orientation
Arguments
- x
datavolleyplays: the plays component of a datavolley object as returned by
dv_read- target_start_end
string: "lower" or "upper"
Value
A logical index with length equal to the number of rows of x. TRUE indicates rows of x that need their coordinates flipped