Average Error: 2.8 → 0.2
Time: 3.7s
Precision: 64
\[x + \frac{y}{1.12837916709551256 \cdot e^{z} - x \cdot y}\]
↓
\[x + \frac{1}{\frac{1.12837916709551256 \cdot \frac{e^{z}}{\sqrt[3]{y} \cdot \sqrt[3]{y}}}{\sqrt[3]{y}} - x}\]
x + \frac{y}{1.12837916709551256 \cdot e^{z} - x \cdot y}
↓
x + \frac{1}{\frac{1.12837916709551256 \cdot \frac{e^{z}}{\sqrt[3]{y} \cdot \sqrt[3]{y}}}{\sqrt[3]{y}} - x}
double code(double x, double y, double z) {
	return ((double) (x + ((double) (y / ((double) (((double) (1.1283791670955126 * ((double) exp(z)))) - ((double) (x * y))))))));
}
↓
double code(double x, double y, double z) {
	return ((double) (x + ((double) (1.0 / ((double) (((double) (((double) (1.1283791670955126 * ((double) (((double) exp(z)) / ((double) (((double) cbrt(y)) * ((double) cbrt(y)))))))) / ((double) cbrt(y)))) - x))))));
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original2.8
Target0.0
Herbie0.2
\[x + \frac{1}{\frac{1.12837916709551256}{y} \cdot e^{z} - x}\]

Derivation

  1. Initial program 2.8

    \[x + \frac{y}{1.12837916709551256 \cdot e^{z} - x \cdot y}\]
  2. Using strategy rm

  3. Applied clear-num2.8

    \[\leadsto x + \color{blue}{\frac{1}{\frac{1.12837916709551256 \cdot e^{z} - x \cdot y}{y}}}\]

  4. Taylor expanded around inf 0.1

    \[\leadsto x + \frac{1}{\color{blue}{1.12837916709551256 \cdot \frac{e^{z}}{y} - x}}\]
  5. Using strategy rm

  6. Applied add-cube-cbrt0.2

    \[\leadsto x + \frac{1}{1.12837916709551256 \cdot \frac{e^{z}}{\color{blue}{\left(\sqrt[3]{y} \cdot \sqrt[3]{y}\right) \cdot \sqrt[3]{y}}} - x}\]

  7. Applied associate-/r*0.2

    \[\leadsto x + \frac{1}{1.12837916709551256 \cdot \color{blue}{\frac{\frac{e^{z}}{\sqrt[3]{y} \cdot \sqrt[3]{y}}}{\sqrt[3]{y}}} - x}\]

  8. Applied associate-*r/0.2

    \[\leadsto x + \frac{1}{\color{blue}{\frac{1.12837916709551256 \cdot \frac{e^{z}}{\sqrt[3]{y} \cdot \sqrt[3]{y}}}{\sqrt[3]{y}}} - x}\]

  9. Final simplification0.2

    \[\leadsto x + \frac{1}{\frac{1.12837916709551256 \cdot \frac{e^{z}}{\sqrt[3]{y} \cdot \sqrt[3]{y}}}{\sqrt[3]{y}} - x}\]

Reproduce

herbie shell --seed 2020114 
(FPCore (x y z)
  :name "Numeric.SpecFunctions:invErfc from math-functions-0.1.5.2, A"
  :precision binary64

  :herbie-target
  (+ x (/ 1 (- (* (/ 1.1283791670955126 y) (exp z)) x)))

  (+ x (/ y (- (* 1.1283791670955126 (exp z)) (* x y)))))