Numeric.SpecFunctions:incompleteGamma from math-functions-0.1.5.2, B

Average Error: 0.63% → 0.62%

Time: 9.9s

Precision: binary64

Cost: 7232

Math

\[\left(3 \cdot \sqrt{x}\right) \cdot \left(\left(y + \frac{1}{x \cdot 9}\right) - 1\right) \]

↓

\[3 \cdot \left(\sqrt{x} \cdot \left(y + \left(\frac{\frac{1}{x}}{9} + -1\right)\right)\right) \]

FPCore

(FPCore (x y)
 :precision binary64
 (* (* 3.0 (sqrt x)) (- (+ y (/ 1.0 (* x 9.0))) 1.0)))

↓

(FPCore (x y)
 :precision binary64
 (* 3.0 (* (sqrt x) (+ y (+ (/ (/ 1.0 x) 9.0) -1.0)))))

C

double code(double x, double y) {
	return (3.0 * sqrt(x)) * ((y + (1.0 / (x * 9.0))) - 1.0);
}

↓

double code(double x, double y) {
	return 3.0 * (sqrt(x) * (y + (((1.0 / x) / 9.0) + -1.0)));
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = (3.0d0 * sqrt(x)) * ((y + (1.0d0 / (x * 9.0d0))) - 1.0d0)
end function

↓

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = 3.0d0 * (sqrt(x) * (y + (((1.0d0 / x) / 9.0d0) + (-1.0d0))))
end function

Java

public static double code(double x, double y) {
	return (3.0 * Math.sqrt(x)) * ((y + (1.0 / (x * 9.0))) - 1.0);
}

↓

public static double code(double x, double y) {
	return 3.0 * (Math.sqrt(x) * (y + (((1.0 / x) / 9.0) + -1.0)));
}

Python

def code(x, y):
	return (3.0 * math.sqrt(x)) * ((y + (1.0 / (x * 9.0))) - 1.0)

↓

def code(x, y):
	return 3.0 * (math.sqrt(x) * (y + (((1.0 / x) / 9.0) + -1.0)))

Julia

function code(x, y)
	return Float64(Float64(3.0 * sqrt(x)) * Float64(Float64(y + Float64(1.0 / Float64(x * 9.0))) - 1.0))
end

↓

function code(x, y)
	return Float64(3.0 * Float64(sqrt(x) * Float64(y + Float64(Float64(Float64(1.0 / x) / 9.0) + -1.0))))
end

MATLAB

function tmp = code(x, y)
	tmp = (3.0 * sqrt(x)) * ((y + (1.0 / (x * 9.0))) - 1.0);
end

↓

function tmp = code(x, y)
	tmp = 3.0 * (sqrt(x) * (y + (((1.0 / x) / 9.0) + -1.0)));
end

Wolfram

code[x_, y_] := N[(N[(3.0 * N[Sqrt[x], $MachinePrecision]), $MachinePrecision] * N[(N[(y + N[(1.0 / N[(x * 9.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - 1.0), $MachinePrecision]), $MachinePrecision]

↓

code[x_, y_] := N[(3.0 * N[(N[Sqrt[x], $MachinePrecision] * N[(y + N[(N[(N[(1.0 / x), $MachinePrecision] / 9.0), $MachinePrecision] + -1.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Target

Original	0.63%
Target	0.63%
Herbie	0.62%

\[3 \cdot \left(y \cdot \sqrt{x} + \left(\frac{1}{x \cdot 9} - 1\right) \cdot \sqrt{x}\right) \]

Derivation

1. Initial program 0.63

   \[\left(3 \cdot \sqrt{x}\right) \cdot \left(\left(y + \frac{1}{x \cdot 9}\right) - 1\right) \]

2. Simplified 0.62

   \[\leadsto \color{blue}{3 \cdot \left(\sqrt{x} \cdot \left(y + \left(\frac{\frac{1}{x}}{9} - 1\right)\right)\right)} \]
   Proof

   [Start] 0.63	\[ \left(3 \cdot \sqrt{x}\right) \cdot \left(\left(y + \frac{1}{x \cdot 9}\right) - 1\right) \]
   associate-*l* [=>] 0.63	\[ \color{blue}{3 \cdot \left(\sqrt{x} \cdot \left(\left(y + \frac{1}{x \cdot 9}\right) - 1\right)\right)} \]
   *-rgt-identity [<=] 0.63	\[ 3 \cdot \color{blue}{\left(\left(\sqrt{x} \cdot \left(\left(y + \frac{1}{x \cdot 9}\right) - 1\right)\right) \cdot 1\right)} \]
   associate-*l* [=>] 0.63	\[ 3 \cdot \color{blue}{\left(\sqrt{x} \cdot \left(\left(\left(y + \frac{1}{x \cdot 9}\right) - 1\right) \cdot 1\right)\right)} \]
   associate-*l* [<=] 0.63	\[ 3 \cdot \color{blue}{\left(\left(\sqrt{x} \cdot \left(\left(y + \frac{1}{x \cdot 9}\right) - 1\right)\right) \cdot 1\right)} \]
   *-rgt-identity [=>] 0.63	\[ 3 \cdot \color{blue}{\left(\sqrt{x} \cdot \left(\left(y + \frac{1}{x \cdot 9}\right) - 1\right)\right)} \]
   associate--l+ [=>] 0.63	\[ 3 \cdot \left(\sqrt{x} \cdot \color{blue}{\left(y + \left(\frac{1}{x \cdot 9} - 1\right)\right)}\right) \]
   +-commutative [=>] 0.63	\[ 3 \cdot \left(\sqrt{x} \cdot \color{blue}{\left(\left(\frac{1}{x \cdot 9} - 1\right) + y\right)}\right) \]
   remove-double-neg [<=] 0.63	\[ 3 \cdot \left(\sqrt{x} \cdot \left(\left(\frac{1}{x \cdot 9} - 1\right) + \color{blue}{\left(-\left(-y\right)\right)}\right)\right) \]
   sub-neg [<=] 0.63	\[ 3 \cdot \left(\sqrt{x} \cdot \color{blue}{\left(\left(\frac{1}{x \cdot 9} - 1\right) - \left(-y\right)\right)}\right) \]
   sub-neg [=>] 0.63	\[ 3 \cdot \left(\sqrt{x} \cdot \color{blue}{\left(\left(\frac{1}{x \cdot 9} - 1\right) + \left(-\left(-y\right)\right)\right)}\right) \]
   remove-double-neg [=>] 0.63	\[ 3 \cdot \left(\sqrt{x} \cdot \left(\left(\frac{1}{x \cdot 9} - 1\right) + \color{blue}{y}\right)\right) \]
   +-commutative [<=] 0.63	\[ 3 \cdot \left(\sqrt{x} \cdot \color{blue}{\left(y + \left(\frac{1}{x \cdot 9} - 1\right)\right)}\right) \]
   sub-neg [=>] 0.63	\[ 3 \cdot \left(\sqrt{x} \cdot \left(y + \color{blue}{\left(\frac{1}{x \cdot 9} + \left(-1\right)\right)}\right)\right) \]
   sub-neg [<=] 0.63	\[ 3 \cdot \left(\sqrt{x} \cdot \left(y + \color{blue}{\left(\frac{1}{x \cdot 9} - 1\right)}\right)\right) \]
   associate-/r* [=>] 0.62	\[ 3 \cdot \left(\sqrt{x} \cdot \left(y + \left(\color{blue}{\frac{\frac{1}{x}}{9}} - 1\right)\right)\right) \]

3. Final simplification 0.62

   \[\leadsto 3 \cdot \left(\sqrt{x} \cdot \left(y + \left(\frac{\frac{1}{x}}{9} + -1\right)\right)\right) \]

Alternatives

Alternative 1
Error	14.85%
Cost	7108

\[\begin{array}{l} t_0 := 3 \cdot \sqrt{x}\\ \mathbf{if}\;x \leq 1.46 \cdot 10^{-22}:\\ \;\;\;\;\frac{t_0}{x \cdot 9}\\ \mathbf{else}:\\ \;\;\;\;\frac{t_0}{\frac{1}{y + -1}}\\ \end{array} \]

Alternative 2
Error	0.63%
Cost	7104

\[3 \cdot \left(\sqrt{x} \cdot \left(y + \left(\frac{0.1111111111111111}{x} + -1\right)\right)\right) \]

Alternative 3
Error	41.71%
Cost	6985

\[\begin{array}{l} \mathbf{if}\;y \leq -3.6 \cdot 10^{-11} \lor \neg \left(y \leq 0.024\right):\\ \;\;\;\;3 \cdot \left(\sqrt{x} \cdot y\right)\\ \mathbf{else}:\\ \;\;\;\;\sqrt{x} \cdot -3\\ \end{array} \]

Alternative 4
Error	35.39%
Cost	6984

\[\begin{array}{l} \mathbf{if}\;x \leq 9.2 \cdot 10^{-24}:\\ \;\;\;\;\sqrt{x} \cdot \frac{0.3333333333333333}{x}\\ \mathbf{elif}\;x \leq 1.7 \cdot 10^{+162}:\\ \;\;\;\;3 \cdot \left(\sqrt{x} \cdot y\right)\\ \mathbf{else}:\\ \;\;\;\;\sqrt{x} \cdot -3\\ \end{array} \]

Alternative 5
Error	14.83%
Cost	6980

\[\begin{array}{l} \mathbf{if}\;x \leq 1.15 \cdot 10^{-22}:\\ \;\;\;\;\sqrt{x} \cdot \frac{0.3333333333333333}{x}\\ \mathbf{else}:\\ \;\;\;\;\sqrt{x} \cdot \left(3 \cdot y + -3\right)\\ \end{array} \]

Alternative 6
Error	14.83%
Cost	6980

\[\begin{array}{l} \mathbf{if}\;x \leq 1.7 \cdot 10^{-23}:\\ \;\;\;\;\frac{3 \cdot \sqrt{x}}{x \cdot 9}\\ \mathbf{else}:\\ \;\;\;\;\sqrt{x} \cdot \left(3 \cdot y + -3\right)\\ \end{array} \]

Alternative 7
Error	96.67%
Cost	6592

\[\sqrt{x \cdot 9} \]

Alternative 8
Error	73.02%
Cost	6592

\[\sqrt{x} \cdot -3 \]

Reproduce

herbie shell --seed 2023090 
(FPCore (x y)
  :name "Numeric.SpecFunctions:incompleteGamma from math-functions-0.1.5.2, B"
  :precision binary64

  :herbie-target
  (* 3.0 (+ (* y (sqrt x)) (* (- (/ 1.0 (* x 9.0)) 1.0) (sqrt x))))

  (* (* 3.0 (sqrt x)) (- (+ y (/ 1.0 (* x 9.0))) 1.0)))