Diagrams.Segment:$catParam from diagrams-lib-1.3.0.3, B

Average Error: 0.3 → 0.2

Time: 7.1s

Precision: binary64

Cost: 448

Math

\[\left(\left(x \cdot 3\right) \cdot y\right) \cdot y \]

↓

\[\left(3 \cdot y\right) \cdot \left(x \cdot y\right) \]

FPCore

(FPCore (x y) :precision binary64 (* (* (* x 3.0) y) y))

↓

(FPCore (x y) :precision binary64 (* (* 3.0 y) (* x y)))

C

double code(double x, double y) {
	return ((x * 3.0) * y) * y;
}

↓

double code(double x, double y) {
	return (3.0 * y) * (x * y);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = ((x * 3.0d0) * y) * y
end function

↓

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = (3.0d0 * y) * (x * y)
end function

Java

public static double code(double x, double y) {
	return ((x * 3.0) * y) * y;
}

↓

public static double code(double x, double y) {
	return (3.0 * y) * (x * y);
}

Python

def code(x, y):
	return ((x * 3.0) * y) * y

↓

def code(x, y):
	return (3.0 * y) * (x * y)

Julia

function code(x, y)
	return Float64(Float64(Float64(x * 3.0) * y) * y)
end

↓

function code(x, y)
	return Float64(Float64(3.0 * y) * Float64(x * y))
end

MATLAB

function tmp = code(x, y)
	tmp = ((x * 3.0) * y) * y;
end

↓

function tmp = code(x, y)
	tmp = (3.0 * y) * (x * y);
end

Wolfram

code[x_, y_] := N[(N[(N[(x * 3.0), $MachinePrecision] * y), $MachinePrecision] * y), $MachinePrecision]

↓

code[x_, y_] := N[(N[(3.0 * y), $MachinePrecision] * N[(x * y), $MachinePrecision]), $MachinePrecision]

Target

Original	0.3
Target	0.2
Herbie	0.2

\[\left(x \cdot \left(3 \cdot y\right)\right) \cdot y \]

Derivation

1. Initial program 0.3

   \[\left(\left(x \cdot 3\right) \cdot y\right) \cdot y \]

2. Simplified 0.2

   \[\leadsto \color{blue}{\left(3 \cdot y\right) \cdot \left(x \cdot y\right)} \]
   Proof

   [Start] 0.3	\[ \left(\left(x \cdot 3\right) \cdot y\right) \cdot y \]
   rational.json-simplify-2 [=>] 0.3	\[ \color{blue}{y \cdot \left(\left(x \cdot 3\right) \cdot y\right)} \]
   rational.json-simplify-2 [=>] 0.3	\[ y \cdot \color{blue}{\left(y \cdot \left(x \cdot 3\right)\right)} \]
   rational.json-simplify-43 [=>] 0.2	\[ y \cdot \color{blue}{\left(x \cdot \left(3 \cdot y\right)\right)} \]
   rational.json-simplify-2 [=>] 0.2	\[ y \cdot \color{blue}{\left(\left(3 \cdot y\right) \cdot x\right)} \]
   rational.json-simplify-43 [=>] 0.2	\[ \color{blue}{\left(3 \cdot y\right) \cdot \left(x \cdot y\right)} \]

3. Final simplification 0.2

   \[\leadsto \left(3 \cdot y\right) \cdot \left(x \cdot y\right) \]

Alternatives

Alternative 1
Error	0.3
Cost	448

\[3 \cdot \left(\left(y \cdot x\right) \cdot y\right) \]

Reproduce

herbie shell --seed 2023075 
(FPCore (x y)
  :name "Diagrams.Segment:$catParam from diagrams-lib-1.3.0.3, B"
  :precision binary64

  :herbie-target
  (* (* x (* 3.0 y)) y)

  (* (* (* x 3.0) y) y))