Average Error: 13.6 → 0.3
Time: 45.7s
Precision: 64
Internal Precision: 384
\[\left(-x \cdot \frac{1}{\tan B}\right) + \frac{F}{\sin B} \cdot {\left(\left(F \cdot F + 2\right) + 2 \cdot x\right)}^{\left(-\frac{1}{2}\right)}\]
↓
\[\begin{array}{l} \mathbf{if}\;F \le -151416668.69822884:\\ \;\;\;\;\frac{x}{\left(F \cdot F\right) \cdot \sin B} - (\left(\frac{\cos B}{\sin B}\right) \cdot x + \left(\frac{1}{\sin B}\right))_*\\ \mathbf{if}\;F \le 146038942.19899994:\\ \;\;\;\;(\left({\left(\sqrt{(F \cdot F + \left((2 \cdot x + 2)_*\right))_*}\right)}^{\left(-\frac{1}{2}\right)} \cdot {\left(\sqrt{(F \cdot F + \left((2 \cdot x + 2)_*\right))_*}\right)}^{\left(-\frac{1}{2}\right)}\right) \cdot \left(\frac{F}{\sin B}\right) + \left(\frac{-x}{\tan B}\right))_*\\ \mathbf{else}:\\ \;\;\;\;\left(\frac{1}{\sin B} + \frac{-x}{\tan B}\right) - \frac{1}{\sin B \cdot \left(F \cdot F\right)}\\ \end{array}\]

Error

Bits error versus F

Bits error versus B

Bits error versus x

Derivation

  1. Split input into 3 regimes

  2. if F < -151416668.69822884

    1. Initial program 24.8

      \[\left(-x \cdot \frac{1}{\tan B}\right) + \frac{F}{\sin B} \cdot {\left(\left(F \cdot F + 2\right) + 2 \cdot x\right)}^{\left(-\frac{1}{2}\right)}\]

    2. Applied simplify24.7

      \[\leadsto \color{blue}{(\left({\left((F \cdot F + \left((2 \cdot x + 2)_*\right))_*\right)}^{\left(-\frac{1}{2}\right)}\right) \cdot \left(\frac{F}{\sin B}\right) + \left(\frac{-x}{\tan B}\right))_*}\]

    3. Taylor expanded around -inf 0.2

      \[\leadsto \color{blue}{\frac{x}{{F}^{2} \cdot \sin B} - \left(\frac{1}{\sin B} + \frac{\cos B \cdot x}{\sin B}\right)}\]

    4. Applied simplify0.2

      \[\leadsto \color{blue}{\frac{x}{\left(F \cdot F\right) \cdot \sin B} - (\left(\frac{\cos B}{\sin B}\right) \cdot x + \left(\frac{1}{\sin B}\right))_*}\]

    if -151416668.69822884 < F < 146038942.19899994

    1. Initial program 0.4

      \[\left(-x \cdot \frac{1}{\tan B}\right) + \frac{F}{\sin B} \cdot {\left(\left(F \cdot F + 2\right) + 2 \cdot x\right)}^{\left(-\frac{1}{2}\right)}\]

    2. Applied simplify0.3

      \[\leadsto \color{blue}{(\left({\left((F \cdot F + \left((2 \cdot x + 2)_*\right))_*\right)}^{\left(-\frac{1}{2}\right)}\right) \cdot \left(\frac{F}{\sin B}\right) + \left(\frac{-x}{\tan B}\right))_*}\]
    3. Using strategy rm

    4. Applied add-sqr-sqrt0.3

      \[\leadsto (\left({\color{blue}{\left(\sqrt{(F \cdot F + \left((2 \cdot x + 2)_*\right))_*} \cdot \sqrt{(F \cdot F + \left((2 \cdot x + 2)_*\right))_*}\right)}}^{\left(-\frac{1}{2}\right)}\right) \cdot \left(\frac{F}{\sin B}\right) + \left(\frac{-x}{\tan B}\right))_*\]

    5. Applied unpow-prod-down0.3

      \[\leadsto (\color{blue}{\left({\left(\sqrt{(F \cdot F + \left((2 \cdot x + 2)_*\right))_*}\right)}^{\left(-\frac{1}{2}\right)} \cdot {\left(\sqrt{(F \cdot F + \left((2 \cdot x + 2)_*\right))_*}\right)}^{\left(-\frac{1}{2}\right)}\right)} \cdot \left(\frac{F}{\sin B}\right) + \left(\frac{-x}{\tan B}\right))_*\]

    if 146038942.19899994 < F

    1. Initial program 25.3

      \[\left(-x \cdot \frac{1}{\tan B}\right) + \frac{F}{\sin B} \cdot {\left(\left(F \cdot F + 2\right) + 2 \cdot x\right)}^{\left(-\frac{1}{2}\right)}\]

    2. Taylor expanded around inf 0.2

      \[\leadsto \left(-x \cdot \frac{1}{\tan B}\right) + \color{blue}{\left(\frac{1}{\sin B} - \frac{1}{{F}^{2} \cdot \sin B}\right)}\]

    3. Applied simplify0.2

      \[\leadsto \color{blue}{\left(\frac{1}{\sin B} + \frac{-x}{\tan B}\right) - \frac{1}{\sin B \cdot \left(F \cdot F\right)}}\]
  3. Recombined 3 regimes into one program.

Runtime

Time bar (total: 45.7s)Debug logProfile

herbie shell --seed '#(1070355188 2193211668 3977393919 3454156579 3755371326 1656365382)' +o rules:numerics
(FPCore (F B x)
  :name "VandenBroeck and Keller, Equation (23)"
  (+ (- (* x (/ 1 (tan B)))) (* (/ F (sin B)) (pow (+ (+ (* F F) 2) (* 2 x)) (- (/ 1 2))))))