Utility class. More...

#include <clipper_util.h>

Classes
union	U32
union	U64
Public Member Functions
	Util ()
	null constructor
Static Public Member Functions
static const ftype &	nan ()
	fast Util::nan() value
static const float &	nanf ()
	fast Util::nan() value
static const double &	nand ()
	fast Util::nan() value
static void	set_null (ftype32 &f)
	set null floating value - a specific value of NaN used for missings
static void	set_null (ftype64 &f)
	set null floating value - a specific value of NaN used for missings
static bool	is_null (const ftype32 &f)
	fast test for null floating value - only works if set from Util::null()
static bool	is_null (const ftype64 &f)
	fast test for null floating value - only works if set from Util::null()
static bool	is_nan (const ftype32 f)
	fast Util::nan() test
static bool	is_nan (const ftype64 f)
	fast Util::nan() test
static bool	isnan (const ftype32 f)
	slow general NaN test for compatibility
static bool	isnan (const ftype64 f)
	slow general NaN test for compatibility
static ftype	sim (const ftype &x)
	Sim function: I1(X)/I0(X)
static ftype	invsim (const ftype &x)
	Inverse Sim function: I1(X)/I0(X)
static ftype	sim_integ (const ftype &x)
	Integral of Sim function: log(I0(X))
static ftype	sim_deriv (const ftype &x)
	Derivative of Sim function: d/dx( I1(X)/I0(x) )
static ftype	sim_deriv_recur (const ftype &x)
	Derivative of Sim function using recurrance: -sim(x)/x + (1 - sim(x)^2)
static ftype	atanh (const ftype &x)
	Arc hyperbolic tangent.
static ftype	bessel_i0 (const ftype &x)
	Modified Bessel function of the first kind.
static ftype	u2b (const ftype &x)
	Convert isotropic U-value to B-factor.
static ftype	b2u (const ftype &x)
	Convert isotropic B-factor to U-value.
template<class T >
static T	mean (const T &pl, const T &mi)
	Convert F+/F- to mean F, with NaN checks.
template<class T >
static T	sig_mean (const T &pl, const T &mi, const T &cov)
	Convert sigF+/sigF-/cov to sig F, with NaN checks.
static int	intf (const ftype &a)
	Truncate-to-integer: int(floor(a))
static int	intc (const ftype &a)
	Truncate-to-integer above: int(ceil(a))
static int	intr (const ftype &a)
	Round-to-integer: int(round(a))
static ftype	mod (const ftype &a, const ftype &b)
	Corrected mod.
static int	mod (const int &a, const int &b)
	Corrected mod.
template<class T >
static T	max (const T &a, const T &b)
	max
template<class T >
static T	min (const T &a, const T &b)
	min
template<class T >
static T	bound (const T &min, const T &val, const T &max)
	bound a value by limits
template<class T >
static void	swap (T &a, T &b)
	swap the contents of two objects
template<class T >
static void	swap (T &a, T &b, T &c)
	swap the contents of two objects, using third as store (for speed)
template<class T >
static T	sqr (const T &a)
	square
template<class T >
static T	isqrt (const T &n)
	Integer square root (returns floor of sqrt)
static const ftype &	pi ()
	pi
static const ftype &	twopi ()
	2 pi
static const ftype &	twopi2 ()
	2 pi squared
static const ftype &	eightpi2 ()
	8 pi squared
static ftype	d2rad (const ftype &x)
	degree-to-radian conversion
static ftype	rad2d (const ftype &x)
	degree-to-radian conversion