functional_x Function

public function functional_x(p, g, rho, d_rho) result(e)

exchange functional

Arguments

Type	Intent	Optional	Attributes		Name
type(param),	intent(in)			::	p
type(grid3d),	intent(in)			::	g
real(kind=long),	intent(in)			::	rho(:)
real(kind=long),	intent(in),	optional		::	d_rho(:)

Return Value real(kind=long)