Average Error: 5.1 → 0.1
Time: 12.9s
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 r257085 = x;
        double r257086 = y;
        double r257087 = r257086 * r257086;
        double r257088 = r257085 / r257087;
        double r257089 = 3.0;
        double r257090 = r257088 - r257089;
        return r257090;
}
↓
double f(double x, double y) {
        double r257091 = x;
        double r257092 = y;
        double r257093 = r257091 / r257092;
        double r257094 = r257093 / r257092;
        double r257095 = 3.0;
        double r257096 = r257094 - r257095;
        return r257096;
}

Error

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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 2020056 +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))