Units Namespace Reference

Constants and functions for physical unit conversions. More...

Variables
static constexpr double	angstrom = 1.e-1 * nanometer
static constexpr double	deg = (3.1415926535897932 / 180.0) * rad
static constexpr double	gauss = 1e-4
static constexpr double	micrometer = 1.e+3 * nanometer
static constexpr double	millimeter = 1.e+6 * nanometer
static constexpr double	nanometer = 1.
	Internal unit for lengths.
static constexpr double	nm = nanometer
static constexpr double	nm2 = nanometer * nanometer
static constexpr double	rad = 1.
	Radian, internal unit for angles.
static constexpr double	tesla = 1.
	Internal unit for magnetic fields.

Detailed Description

Constants and functions for physical unit conversions.

In user code, quantities that have a physical dimension should always be given in the form value * unit, e.g. 0.529 * angstrom for a length, or 45 * deg for an angle.

Internally, BornAgain has length, angle, magnetic field units of nanometer, radians, Tesla. Therefore, in principle, the multipliers nm, rad, tesla could be ommited from code. However, to make code more readable, and to prevent misunderstandings, we recommend that physical dimension be always made clear by multiplying values with an appropriate constant, even if this expands to 1.