Average Error: 14.0 → 14.0
Time: 2.5m
Precision: 64
Internal Precision: 576
\[1 - \left(\frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(0.254829592 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(-0.284496736 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(1.421413741 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(-1.453152027 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot 1.061405429\right)\right)\right)\right)\right) \cdot e^{-\left|x\right| \cdot \left|x\right|}\]
↓
\[1 - \left(\frac{1}{1 + \left|x\right| \cdot 0.3275911} \cdot \left(0.254829592 + \frac{1}{1 + \left|x\right| \cdot 0.3275911} \cdot \left(\left(\sqrt[3]{\left(1.061405429 \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911} + -1.453152027\right) \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911}} \cdot \left(\sqrt[3]{\left(1.061405429 \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911} + -1.453152027\right) \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911}} \cdot \sqrt[3]{\left(1.061405429 \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911} + -1.453152027\right) \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911}}\right) + 1.421413741\right) \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911} + -0.284496736\right)\right)\right) \cdot e^{-\left|x\right| \cdot \left|x\right|}\]

Error

Bits error versus x

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 14.0

    \[1 - \left(\frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(0.254829592 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(-0.284496736 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(1.421413741 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(-1.453152027 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot 1.061405429\right)\right)\right)\right)\right) \cdot e^{-\left|x\right| \cdot \left|x\right|}\]
  2. Using strategy rm

  3. Applied add-cube-cbrt14.0

    \[\leadsto 1 - \left(\frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(0.254829592 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(-0.284496736 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(1.421413741 + \color{blue}{\left(\sqrt[3]{\frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(-1.453152027 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot 1.061405429\right)} \cdot \sqrt[3]{\frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(-1.453152027 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot 1.061405429\right)}\right) \cdot \sqrt[3]{\frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot \left(-1.453152027 + \frac{1}{1 + 0.3275911 \cdot \left|x\right|} \cdot 1.061405429\right)}}\right)\right)\right)\right) \cdot e^{-\left|x\right| \cdot \left|x\right|}\]

  4. Final simplification14.0

    \[\leadsto 1 - \left(\frac{1}{1 + \left|x\right| \cdot 0.3275911} \cdot \left(0.254829592 + \frac{1}{1 + \left|x\right| \cdot 0.3275911} \cdot \left(\left(\sqrt[3]{\left(1.061405429 \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911} + -1.453152027\right) \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911}} \cdot \left(\sqrt[3]{\left(1.061405429 \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911} + -1.453152027\right) \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911}} \cdot \sqrt[3]{\left(1.061405429 \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911} + -1.453152027\right) \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911}}\right) + 1.421413741\right) \cdot \frac{1}{1 + \left|x\right| \cdot 0.3275911} + -0.284496736\right)\right)\right) \cdot e^{-\left|x\right| \cdot \left|x\right|}\]

Runtime

Time bar (total: 2.5m)Debug logProfile

herbie shell --seed 2018220 +o rules:numerics
(FPCore (x)
  :name "Jmat.Real.erf"
  (- 1 (* (* (/ 1 (+ 1 (* 0.3275911 (fabs x)))) (+ 0.254829592 (* (/ 1 (+ 1 (* 0.3275911 (fabs x)))) (+ -0.284496736 (* (/ 1 (+ 1 (* 0.3275911 (fabs x)))) (+ 1.421413741 (* (/ 1 (+ 1 (* 0.3275911 (fabs x)))) (+ -1.453152027 (* (/ 1 (+ 1 (* 0.3275911 (fabs x)))) 1.061405429))))))))) (exp (- (* (fabs x) (fabs x)))))))