Average Error: 5.1 → 0.1
Time: 2.7s
Precision: 64
\[\frac{x}{y \cdot y} - 3\]
↓
\[\frac{\frac{x}{y}}{y} - 3\]
\frac{x}{y \cdot y} - 3
↓
\frac{\frac{x}{y}}{y} - 3
double f(double x, double y) {
        double r338785 = x;
        double r338786 = y;
        double r338787 = r338786 * r338786;
        double r338788 = r338785 / r338787;
        double r338789 = 3.0;
        double r338790 = r338788 - r338789;
        return r338790;
}
↓
double f(double x, double y) {
        double r338791 = x;
        double r338792 = y;
        double r338793 = r338791 / r338792;
        double r338794 = r338793 / r338792;
        double r338795 = 3.0;
        double r338796 = r338794 - r338795;
        return r338796;
}

Error

Bits error versus x

Bits error versus y

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Results

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Target

Original5.1
Target0.1
Herbie0.1
\[\frac{\frac{x}{y}}{y} - 3\]

Derivation

  1. Initial program 5.1

    \[\frac{x}{y \cdot y} - 3\]
  2. Using strategy rm

  3. Applied associate-/r*0.1

    \[\leadsto \color{blue}{\frac{\frac{x}{y}}{y}} - 3\]

  4. Final simplification0.1

    \[\leadsto \frac{\frac{x}{y}}{y} - 3\]

Reproduce

herbie shell --seed 2019354 +o rules:numerics
(FPCore (x y)
  :name "Statistics.Sample:$skurtosis from math-functions-0.1.5.2"
  :precision binary64

  :herbie-target
  (- (/ (/ x y) y) 3)

  (- (/ x (* y y)) 3))