Exemplo n.º 1
0
func TestHeight(t *testing.T) {
	defer logElapsedTime(time.Now(), "TestHeight")
	tree := NewRBTree()
	for i := 0; i < maxKeys; i++ {
		tree.Put(&IntKey{key: i, value: i})
	}
	maxHeight := math.Ilogb(float64(maxKeys))
	if tree.Height() > maxHeight {
		t.Errorf("tree.Height(), expected: %d, got: %d", maxHeight, tree.Height())
	}
}
Exemplo n.º 2
0
// MaxLevel returns the maximum level such that the metric is at least
// the given value, or zero if there is no such level.
func (m Metric) MaxLevel(val float64) int {
	if val <= 0 {
		return maxLevel
	}

	level := math.Ilogb(m.Deriv/val) >> uint(m.Dim-1)
	if level > maxLevel {
		level = maxLevel
	}
	if level < 0 {
		level = 0
	}
	return level
}
Exemplo n.º 3
0
// MinLevel returns the minimum level such that the metric is at most
// the given value, or maxLevel (30) if there is no such level.
func (m Metric) MinLevel(val float64) int {
	if val < 0 {
		return maxLevel
	}

	level := -(math.Ilogb(val/m.Deriv) >> uint(m.Dim-1))
	if level > maxLevel {
		level = maxLevel
	}
	if level < 0 {
		level = 0
	}
	return level
}
Exemplo n.º 4
0
func Levels(n Nodes) Level {
	return Level(math.Ilogb(float64(n*2-1)) + 1)
}
Exemplo n.º 5
0
func Ilogb(x float32) int                 { return math.Ilogb(float64(x)) }
Exemplo n.º 6
0
func pkg(it *ts.Interpreter) map[string]*ts.Object {
	toFloat := it.Accessor("toFloat")

	flt := func(x *ts.Object) float64 {
		return x.Call(toFloat).ToFloat()
	}

	wrap1 := func(f func(a float64) float64) *ts.Object {
		return ts.Wrap(func(o, a *ts.Object) *ts.Object {
			return ts.Wrap(f(flt(a)))
		})
	}

	wrap2 := func(f func(a, b float64) float64) *ts.Object {
		return ts.Wrap(func(o, a, b *ts.Object) *ts.Object {
			return ts.Wrap(f(flt(a), flt(b)))
		})
	}

	return map[string]*ts.Object{
		"E":         ts.Wrap(math.E),
		"PI":        ts.Wrap(math.Pi),
		"PHI":       ts.Wrap(math.Phi),
		"SQRT2":     ts.Wrap(math.Sqrt2),
		"SQRTE":     ts.Wrap(math.SqrtE),
		"SQRTPI":    ts.Wrap(math.SqrtPi),
		"SQRTPHI":   ts.Wrap(math.SqrtPhi),
		"LN2":       ts.Wrap(math.Ln2),
		"LOG2E":     ts.Wrap(math.Log2E),
		"LN10":      ts.Wrap(math.Ln10),
		"LOG10E":    ts.Wrap(math.Log10E),
		"abs":       wrap1(math.Abs),
		"acos":      wrap1(math.Acos),
		"acosh":     wrap1(math.Acosh),
		"asin":      wrap1(math.Asin),
		"asinh":     wrap1(math.Asinh),
		"atan":      wrap1(math.Atan),
		"atanh":     wrap1(math.Atanh),
		"cbrt":      wrap1(math.Cbrt),
		"ceil":      wrap1(math.Ceil),
		"cos":       wrap1(math.Cos),
		"cosh":      wrap1(math.Cosh),
		"erf":       wrap1(math.Erf),
		"erfc":      wrap1(math.Erfc),
		"exp":       wrap1(math.Exp),
		"exp2":      wrap1(math.Exp2),
		"expm1":     wrap1(math.Expm1),
		"floor":     wrap1(math.Floor),
		"gamma":     wrap1(math.Gamma),
		"j0":        wrap1(math.J0),
		"j1":        wrap1(math.J1),
		"log":       wrap1(math.Log),
		"log10":     wrap1(math.Log10),
		"log1p":     wrap1(math.Log1p),
		"log2":      wrap1(math.Log2),
		"logb":      wrap1(math.Logb),
		"sin":       wrap1(math.Sin),
		"sinh":      wrap1(math.Sinh),
		"sqrt":      wrap1(math.Sqrt),
		"tan":       wrap1(math.Tan),
		"tanh":      wrap1(math.Tanh),
		"trunc":     wrap1(math.Trunc),
		"y0":        wrap1(math.Y0),
		"y1":        wrap1(math.Y1),
		"atan2":     wrap2(math.Atan2),
		"copysign":  wrap2(math.Copysign),
		"dim":       wrap2(math.Dim),
		"hypot":     wrap2(math.Hypot),
		"max":       wrap2(math.Max),
		"min":       wrap2(math.Min),
		"mod":       wrap2(math.Mod),
		"nextafter": wrap2(math.Nextafter),
		"pow":       wrap2(math.Pow),
		"remainder": wrap2(math.Remainder),
		"ilogb": ts.Wrap(func(o, x *ts.Object) *ts.Object {
			return ts.Wrap(math.Ilogb(flt(x)))
		}),
		"inf": ts.Wrap(func(o, sign *ts.Object) *ts.Object {
			return ts.Wrap(math.Inf(int(sign.ToInt())))
		}),
		"isInf": ts.Wrap(func(o, x, sign *ts.Object) *ts.Object {
			return ts.Wrap(math.IsInf(flt(x), int(sign.ToInt())))
		}),
		"isNaN": ts.Wrap(func(o, x *ts.Object) *ts.Object {
			return ts.Wrap(math.IsNaN(flt(x)))
		}),
		"NaN": ts.Wrap(math.NaN()),
		"pow10": ts.Wrap(func(o, e *ts.Object) *ts.Object {
			return ts.Wrap(math.Pow10(int(e.ToInt())))
		}),
		"jn": ts.Wrap(func(o, n, x *ts.Object) *ts.Object {
			return ts.Wrap(math.Jn(int(n.ToInt()), flt(x)))
		}),
		"yn": ts.Wrap(func(o, n, x *ts.Object) *ts.Object {
			return ts.Wrap(math.Yn(int(n.ToInt()), flt(x)))
		}),
		"seedRand": ts.Wrap(func(o, s *ts.Object) *ts.Object {
			rand.Seed(s.ToInt())
			return ts.Nil
		}),
		"rand": ts.Wrap(func(o *ts.Object) *ts.Object {
			return ts.Wrap(rand.Float64())
		}),
	}

}