Average Error: 15.7 → 0.9
Time: 4.6s
Precision: binary64
\[\sqrt[3]{\frac{g}{2 \cdot a}} \]
↓
\[\frac{-\sqrt[3]{g}}{-\sqrt[3]{a \cdot 2}} \]
\sqrt[3]{\frac{g}{2 \cdot a}}
↓
\frac{-\sqrt[3]{g}}{-\sqrt[3]{a \cdot 2}}

(FPCore (g a) :precision binary64 (cbrt (/ g (* 2.0 a))))
↓
(FPCore (g a) :precision binary64 (/ (- (cbrt g)) (- (cbrt (* a 2.0)))))
double code(double g, double a) {
	return cbrt(g / (2.0 * a));
}
↓
double code(double g, double a) {
	return -cbrt(g) / -cbrt(a * 2.0);
}

Error

Bits error versus g

Bits error versus a

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 15.7

    \[\sqrt[3]{\frac{g}{2 \cdot a}} \]

  2. Applied cbrt-div_binary640.9

    \[\leadsto \color{blue}{\frac{\sqrt[3]{g}}{\sqrt[3]{2 \cdot a}}} \]

  3. Applied frac-2neg_binary640.9

    \[\leadsto \color{blue}{\frac{-\sqrt[3]{g}}{-\sqrt[3]{2 \cdot a}}} \]

  4. Simplified0.9

    \[\leadsto \frac{-\sqrt[3]{g}}{\color{blue}{-\sqrt[3]{a \cdot 2}}} \]

  5. Final simplification0.9

    \[\leadsto \frac{-\sqrt[3]{g}}{-\sqrt[3]{a \cdot 2}} \]

Reproduce

herbie shell --seed 2021280 
(FPCore (g a)
  :name "2-ancestry mixing, zero discriminant"
  :precision binary64
  (cbrt (/ g (* 2.0 a))))