get arc-trigonometric values in periods

period_arcTrig(
  x,
  y = NULL,
  arc.fun = c("acos", "asin", "atan", "atan2"),
  return.range = NULL
)

Arguments

x

trigonometric values

y

used for atan2 function. see atan2

arc.fun

arc-trigonometric function

return.range

set NULL for a range of 0 to 2*pi.

Value

angles in radian

Examples