potential_x Function

public function potential_x(p, rho, d_rho) result(pot)

exchange potential

Arguments

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

Return Value real(kind=long), (size(rho))