a parameter of renormalized beta distribution

Average Error: 0.2 → 0.3

Time: 5.3s

Precision: binary64

Cost: 708

\[\left(0 < m \land 0 < v\right) \land v < 0.25\]

Math

\[\left(\frac{m \cdot \left(1 - m\right)}{v} - 1\right) \cdot m \]

↓

\[\begin{array}{l} \mathbf{if}\;m \leq 1.1296446296289777 \cdot 10^{-17}:\\ \;\;\;\;m \cdot \left(\frac{m}{v} + -1\right)\\ \mathbf{else}:\\ \;\;\;\;\frac{m \cdot \left(m \cdot \left(1 - m\right)\right)}{v}\\ \end{array} \]

FPCore

(FPCore (m v) :precision binary64 (* (- (/ (* m (- 1.0 m)) v) 1.0) m))

↓

(FPCore (m v)
 :precision binary64
 (if (<= m 1.1296446296289777e-17)
   (* m (+ (/ m v) -1.0))
   (/ (* m (* m (- 1.0 m))) v)))

C

double code(double m, double v) {
	return (((m * (1.0 - m)) / v) - 1.0) * m;
}

↓

double code(double m, double v) {
	double tmp;
	if (m <= 1.1296446296289777e-17) {
		tmp = m * ((m / v) + -1.0);
	} else {
		tmp = (m * (m * (1.0 - m))) / v;
	}
	return tmp;
}

Fortran

real(8) function code(m, v)
    real(8), intent (in) :: m
    real(8), intent (in) :: v
    code = (((m * (1.0d0 - m)) / v) - 1.0d0) * m
end function

↓

real(8) function code(m, v)
    real(8), intent (in) :: m
    real(8), intent (in) :: v
    real(8) :: tmp
    if (m <= 1.1296446296289777d-17) then
        tmp = m * ((m / v) + (-1.0d0))
    else
        tmp = (m * (m * (1.0d0 - m))) / v
    end if
    code = tmp
end function

Java

public static double code(double m, double v) {
	return (((m * (1.0 - m)) / v) - 1.0) * m;
}

↓

public static double code(double m, double v) {
	double tmp;
	if (m <= 1.1296446296289777e-17) {
		tmp = m * ((m / v) + -1.0);
	} else {
		tmp = (m * (m * (1.0 - m))) / v;
	}
	return tmp;
}

Python

def code(m, v):
	return (((m * (1.0 - m)) / v) - 1.0) * m

↓

def code(m, v):
	tmp = 0
	if m <= 1.1296446296289777e-17:
		tmp = m * ((m / v) + -1.0)
	else:
		tmp = (m * (m * (1.0 - m))) / v
	return tmp

Julia

function code(m, v)
	return Float64(Float64(Float64(Float64(m * Float64(1.0 - m)) / v) - 1.0) * m)
end

↓

function code(m, v)
	tmp = 0.0
	if (m <= 1.1296446296289777e-17)
		tmp = Float64(m * Float64(Float64(m / v) + -1.0));
	else
		tmp = Float64(Float64(m * Float64(m * Float64(1.0 - m))) / v);
	end
	return tmp
end

MATLAB

function tmp = code(m, v)
	tmp = (((m * (1.0 - m)) / v) - 1.0) * m;
end

↓

function tmp_2 = code(m, v)
	tmp = 0.0;
	if (m <= 1.1296446296289777e-17)
		tmp = m * ((m / v) + -1.0);
	else
		tmp = (m * (m * (1.0 - m))) / v;
	end
	tmp_2 = tmp;
end

Wolfram

code[m_, v_] := N[(N[(N[(N[(m * N[(1.0 - m), $MachinePrecision]), $MachinePrecision] / v), $MachinePrecision] - 1.0), $MachinePrecision] * m), $MachinePrecision]

↓

code[m_, v_] := If[LessEqual[m, 1.1296446296289777e-17], N[(m * N[(N[(m / v), $MachinePrecision] + -1.0), $MachinePrecision]), $MachinePrecision], N[(N[(m * N[(m * N[(1.0 - m), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / v), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if m < 1.1296446296289777e-17

   1. Initial program 0.1

      \[\left(\frac{m \cdot \left(1 - m\right)}{v} - 1\right) \cdot m \]

   2. Applied egg-rr 0.3

      \[\leadsto \left(\color{blue}{\frac{\sqrt{m \cdot \left(1 - m\right)}}{1} \cdot \frac{\sqrt{m \cdot \left(1 - m\right)}}{v}} - 1\right) \cdot m \]

   3. Applied egg-rr 0.3

      \[\leadsto \left(\color{blue}{\frac{\sqrt{m \cdot \left(1 - m\right)}}{\frac{v}{\sqrt{m \cdot \left(1 - m\right)}}}} - 1\right) \cdot m \]

   4. Taylor expanded in m around 0 0.1

      \[\leadsto \left(\color{blue}{\frac{m}{v}} - 1\right) \cdot m \]

   if 1.1296446296289777e-17 < m

   1. Initial program 0.4

      \[\left(\frac{m \cdot \left(1 - m\right)}{v} - 1\right) \cdot m \]

   2. Taylor expanded in m around inf 0.9

      \[\leadsto \color{blue}{-1 \cdot \frac{{m}^{3}}{v} + \frac{{m}^{2}}{v}} \]

   3. Simplified 0.9

      \[\leadsto \color{blue}{m \cdot \left(m \cdot \frac{1 - m}{v}\right)} \]
      Proof
      (*.f64 m (*.f64 m (/.f64 (-.f64 1 m) v))): 0 points increase in error, 0 points decrease in error
      (*.f64 m (Rewrite<= *-commutative_binary64 (*.f64 (/.f64 (-.f64 1 m) v) m))): 0 points increase in error, 0 points decrease in error
      (*.f64 m (Rewrite<= associate-/r/_binary64 (/.f64 (-.f64 1 m) (/.f64 v m)))): 34 points increase in error, 28 points decrease in error
      (*.f64 m (Rewrite=> div-sub_binary64 (-.f64 (/.f64 1 (/.f64 v m)) (/.f64 m (/.f64 v m))))): 4 points increase in error, 1 points decrease in error
      (*.f64 m (-.f64 (/.f64 1 (/.f64 v m)) (Rewrite<= associate-/l*_binary64 (/.f64 (*.f64 m m) v)))): 2 points increase in error, 6 points decrease in error
      (*.f64 m (-.f64 (/.f64 1 (/.f64 v m)) (/.f64 (Rewrite<= unpow2_binary64 (pow.f64 m 2)) v))): 0 points increase in error, 0 points decrease in error
      (Rewrite<= distribute-rgt-out--_binary64 (-.f64 (*.f64 (/.f64 1 (/.f64 v m)) m) (*.f64 (/.f64 (pow.f64 m 2) v) m))): 5 points increase in error, 1 points decrease in error
      (-.f64 (*.f64 (Rewrite<= associate-/l*_binary64 (/.f64 (*.f64 1 m) v)) m) (*.f64 (/.f64 (pow.f64 m 2) v) m)): 16 points increase in error, 28 points decrease in error
      (-.f64 (*.f64 (/.f64 (Rewrite=> *-lft-identity_binary64 m) v) m) (*.f64 (/.f64 (pow.f64 m 2) v) m)): 0 points increase in error, 0 points decrease in error
      (-.f64 (Rewrite=> associate-*l/_binary64 (/.f64 (*.f64 m m) v)) (*.f64 (/.f64 (pow.f64 m 2) v) m)): 53 points increase in error, 47 points decrease in error
      (-.f64 (/.f64 (Rewrite<= unpow2_binary64 (pow.f64 m 2)) v) (*.f64 (/.f64 (pow.f64 m 2) v) m)): 0 points increase in error, 0 points decrease in error
      (-.f64 (/.f64 (pow.f64 m 2) v) (Rewrite=> associate-*l/_binary64 (/.f64 (*.f64 (pow.f64 m 2) m) v))): 3 points increase in error, 8 points decrease in error
      (-.f64 (/.f64 (pow.f64 m 2) v) (/.f64 (*.f64 (Rewrite=> unpow2_binary64 (*.f64 m m)) m) v)): 0 points increase in error, 0 points decrease in error
      (-.f64 (/.f64 (pow.f64 m 2) v) (/.f64 (Rewrite<= unpow3_binary64 (pow.f64 m 3)) v)): 3 points increase in error, 1 points decrease in error
      (Rewrite<= unsub-neg_binary64 (+.f64 (/.f64 (pow.f64 m 2) v) (neg.f64 (/.f64 (pow.f64 m 3) v)))): 0 points increase in error, 0 points decrease in error
      (+.f64 (/.f64 (pow.f64 m 2) v) (Rewrite<= mul-1-neg_binary64 (*.f64 -1 (/.f64 (pow.f64 m 3) v)))): 0 points increase in error, 0 points decrease in error
      (Rewrite<= +-commutative_binary64 (+.f64 (*.f64 -1 (/.f64 (pow.f64 m 3) v)) (/.f64 (pow.f64 m 2) v))): 0 points increase in error, 0 points decrease in error

   4. Applied egg-rr 0.9

      \[\leadsto \color{blue}{\frac{\left(m \cdot \left(1 - m\right)\right) \cdot m}{v}} \]
3. Recombined 2 regimes into one program.

4. Final simplification 0.3

   \[\leadsto \begin{array}{l} \mathbf{if}\;m \leq 1.1296446296289777 \cdot 10^{-17}:\\ \;\;\;\;m \cdot \left(\frac{m}{v} + -1\right)\\ \mathbf{else}:\\ \;\;\;\;\frac{m \cdot \left(m \cdot \left(1 - m\right)\right)}{v}\\ \end{array} \]

Alternatives

Alternative 1
Error	0.3
Cost	708

\[\begin{array}{l} \mathbf{if}\;m \leq 1.1296446296289777 \cdot 10^{-17}:\\ \;\;\;\;m \cdot \left(\frac{m}{v} + -1\right)\\ \mathbf{else}:\\ \;\;\;\;\frac{m}{v} \cdot \left(m - m \cdot m\right)\\ \end{array} \]

Alternative 2
Error	0.2
Cost	704

\[m \cdot \left(\frac{m \cdot \left(1 - m\right)}{v} + -1\right) \]

Alternative 3
Error	2.4
Cost	644

\[\begin{array}{l} \mathbf{if}\;m \leq 0.48361068443153143:\\ \;\;\;\;\frac{m}{\frac{v}{m}} - m\\ \mathbf{else}:\\ \;\;\;\;\frac{m}{v} \cdot \left(m \cdot \left(-m\right)\right)\\ \end{array} \]

Alternative 4
Error	2.4
Cost	644

\[\begin{array}{l} \mathbf{if}\;m \leq 0.48361068443153143:\\ \;\;\;\;\frac{m}{\frac{v}{m}} - m\\ \mathbf{else}:\\ \;\;\;\;\frac{m \cdot \left(m \cdot \left(-m\right)\right)}{v}\\ \end{array} \]

Alternative 5
Error	25.2
Cost	452

\[\begin{array}{l} \mathbf{if}\;m \leq 8.955746477490313 \cdot 10^{-166}:\\ \;\;\;\;-m\\ \mathbf{else}:\\ \;\;\;\;\frac{m \cdot m}{v}\\ \end{array} \]

Alternative 6
Error	24.8
Cost	452

\[\begin{array}{l} \mathbf{if}\;v \leq 3.5546595907615584 \cdot 10^{-119}:\\ \;\;\;\;\frac{m}{\frac{v}{m}}\\ \mathbf{else}:\\ \;\;\;\;-m\\ \end{array} \]

Alternative 7
Error	24.8
Cost	452

\[\begin{array}{l} \mathbf{if}\;v \leq 3.5546595907615584 \cdot 10^{-119}:\\ \;\;\;\;m \cdot \frac{m}{v}\\ \mathbf{else}:\\ \;\;\;\;-m\\ \end{array} \]

Alternative 8
Error	10.7
Cost	448

\[m \cdot \left(\frac{m}{v} + -1\right) \]

Alternative 9
Error	10.7
Cost	448

\[\frac{m}{\frac{v}{m}} - m \]

Alternative 10
Error	36.8
Cost	128

\[-m \]

Reproduce

herbie shell --seed 2022312 
(FPCore (m v)
  :name "a parameter of renormalized beta distribution"
  :precision binary64
  :pre (and (and (< 0.0 m) (< 0.0 v)) (< v 0.25))
  (* (- (/ (* m (- 1.0 m)) v) 1.0) m))