f_plus_box Function

public pure function f_plus_box(x, y) result(z)

Box-plus sum $z = 2\tanh^{-1}(\tanh(x/2) \cdot \tanh(y/2))$

Arguments

Type	Intent	Optional	Attributes		Name
real(kind=wp),	intent(in)			::	x
real(kind=wp),	intent(in)			::	y

Return Value real(kind=wp)