Average Error: 15.5 → 0.0
Time: 20.7s
Precision: 64
\[\frac{x - y}{\left(x \cdot 2\right) \cdot y}\]
↓
\[\frac{0.5}{y} - \frac{0.5}{x}\]
\frac{x - y}{\left(x \cdot 2\right) \cdot y}
↓
\frac{0.5}{y} - \frac{0.5}{x}
double f(double x, double y) {
        double r18617984 = x;
        double r18617985 = y;
        double r18617986 = r18617984 - r18617985;
        double r18617987 = 2.0;
        double r18617988 = r18617984 * r18617987;
        double r18617989 = r18617988 * r18617985;
        double r18617990 = r18617986 / r18617989;
        return r18617990;
}
↓
double f(double x, double y) {
        double r18617991 = 0.5;
        double r18617992 = y;
        double r18617993 = r18617991 / r18617992;
        double r18617994 = x;
        double r18617995 = r18617991 / r18617994;
        double r18617996 = r18617993 - r18617995;
        return r18617996;
}

Error

Bits error versus x

Bits error versus y

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Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original15.5
Target0.0
Herbie0.0
\[\frac{0.5}{y} - \frac{0.5}{x}\]

Derivation

  1. Initial program 15.5

    \[\frac{x - y}{\left(x \cdot 2\right) \cdot y}\]

  2. Taylor expanded around 0 0.0

    \[\leadsto \color{blue}{0.5 \cdot \frac{1}{y} - 0.5 \cdot \frac{1}{x}}\]

  3. Simplified0.0

    \[\leadsto \color{blue}{\frac{0.5}{y} - \frac{0.5}{x}}\]

  4. Final simplification0.0

    \[\leadsto \frac{0.5}{y} - \frac{0.5}{x}\]

Reproduce

herbie shell --seed 2019172 +o rules:numerics
(FPCore (x y)
  :name "Linear.Projection:inversePerspective from linear-1.19.1.3, B"

  :herbie-target
  (- (/ 0.5 y) (/ 0.5 x))

  (/ (- x y) (* (* x 2.0) y)))