Average Error: 5.2 → 0.1
Time: 26.9s
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 r194494 = x;
        double r194495 = y;
        double r194496 = r194495 * r194495;
        double r194497 = r194494 / r194496;
        double r194498 = 3.0;
        double r194499 = r194497 - r194498;
        return r194499;
}
↓
double f(double x, double y) {
        double r194500 = x;
        double r194501 = y;
        double r194502 = r194500 / r194501;
        double r194503 = r194502 / r194501;
        double r194504 = 3.0;
        double r194505 = r194503 - r194504;
        return r194505;
}

Error

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Bits error versus y

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Results

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Target

Original5.2
Target0.1
Herbie0.1
\[\frac{\frac{x}{y}}{y} - 3\]

Derivation

  1. Initial program 5.2

    \[\frac{x}{y \cdot y} - 3\]
  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 2019325 +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))