Average Error: 47.5 → 2.6
Time: 2.4m
Precision: 64
Internal Precision: 4480
\[\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) - 1\right)}\]
\[\begin{array}{l} \mathbf{if}\;k \le -1.449716848200777 \cdot 10^{-87}:\\ \;\;\;\;\frac{\frac{\ell}{k}}{\frac{t}{\frac{\ell}{k}}} \cdot \frac{\cos k + \cos k}{\sin k \cdot \sin k}\\ \mathbf{if}\;k \le 2.9444387605578513 \cdot 10^{-145}:\\ \;\;\;\;\left(\frac{\ell}{k} \cdot \frac{\ell}{k}\right) \cdot \left(\frac{\cos k}{\sin k} \cdot \frac{\frac{2}{t}}{\sin k}\right)\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{\ell}{k}}{\frac{t}{\frac{\ell}{k}}} \cdot \frac{\cos k + \cos k}{\sin k \cdot \sin k}\\ \end{array}\]

Error

Bits error versus t

Bits error versus l

Bits error versus k

Derivation

  1. Split input into 2 regimes
  2. if k < -1.449716848200777e-87 or 2.9444387605578513e-145 < k

    1. Initial program 46.3

      \[\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) - 1\right)}\]
    2. Taylor expanded around -inf 62.8

      \[\leadsto \frac{2}{\left(\color{blue}{\frac{e^{3 \cdot \left(\log -1 - \log \left(\frac{-1}{t}\right)\right)} \cdot \sin k}{{\ell}^{2}}} \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) - 1\right)}\]
    3. Applied simplify36.2

      \[\leadsto \color{blue}{\frac{\frac{2}{\frac{{t}^{3}}{\ell}}}{\left((\left(\frac{k}{t}\right) \cdot \left(\frac{k}{t}\right) + 0)_* \cdot \tan k\right) \cdot \frac{\sin k}{\ell}}}\]
    4. Taylor expanded around inf 19.8

      \[\leadsto \color{blue}{2 \cdot \frac{{\ell}^{2} \cdot \cos k}{{k}^{2} \cdot \left(t \cdot {\left(\sin k\right)}^{2}\right)}}\]
    5. Taylor expanded around -inf 62.8

      \[\leadsto 2 \cdot \frac{{\ell}^{2} \cdot \cos k}{\color{blue}{e^{2 \cdot \left(\log -1 - \log \left(\frac{-1}{k}\right)\right)} \cdot \left(t \cdot {\left(\sin k\right)}^{2}\right)}}\]
    6. Applied simplify7.3

      \[\leadsto \color{blue}{\frac{\frac{\ell}{k} \cdot \frac{\ell}{k}}{t} \cdot \frac{\cos k + \cos k}{\sin k \cdot \sin k}}\]
    7. Using strategy rm
    8. Applied associate-/l*1.5

      \[\leadsto \color{blue}{\frac{\frac{\ell}{k}}{\frac{t}{\frac{\ell}{k}}}} \cdot \frac{\cos k + \cos k}{\sin k \cdot \sin k}\]

    if -1.449716848200777e-87 < k < 2.9444387605578513e-145

    1. Initial program 62.3

      \[\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) - 1\right)}\]
    2. Taylor expanded around -inf 62.4

      \[\leadsto \frac{2}{\left(\color{blue}{\frac{e^{3 \cdot \left(\log -1 - \log \left(\frac{-1}{t}\right)\right)} \cdot \sin k}{{\ell}^{2}}} \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) - 1\right)}\]
    3. Applied simplify59.0

      \[\leadsto \color{blue}{\frac{\frac{2}{\frac{{t}^{3}}{\ell}}}{\left((\left(\frac{k}{t}\right) \cdot \left(\frac{k}{t}\right) + 0)_* \cdot \tan k\right) \cdot \frac{\sin k}{\ell}}}\]
    4. Taylor expanded around inf 54.7

      \[\leadsto \color{blue}{2 \cdot \frac{{\ell}^{2} \cdot \cos k}{{k}^{2} \cdot \left(t \cdot {\left(\sin k\right)}^{2}\right)}}\]
    5. Taylor expanded around -inf 62.4

      \[\leadsto 2 \cdot \frac{{\ell}^{2} \cdot \cos k}{\color{blue}{e^{2 \cdot \left(\log -1 - \log \left(\frac{-1}{k}\right)\right)} \cdot \left(t \cdot {\left(\sin k\right)}^{2}\right)}}\]
    6. Applied simplify37.6

      \[\leadsto \color{blue}{\frac{\frac{\ell}{k} \cdot \frac{\ell}{k}}{t} \cdot \frac{\cos k + \cos k}{\sin k \cdot \sin k}}\]
    7. Using strategy rm
    8. Applied div-inv37.6

      \[\leadsto \color{blue}{\left(\left(\frac{\ell}{k} \cdot \frac{\ell}{k}\right) \cdot \frac{1}{t}\right)} \cdot \frac{\cos k + \cos k}{\sin k \cdot \sin k}\]
    9. Applied associate-*l*39.4

      \[\leadsto \color{blue}{\left(\frac{\ell}{k} \cdot \frac{\ell}{k}\right) \cdot \left(\frac{1}{t} \cdot \frac{\cos k + \cos k}{\sin k \cdot \sin k}\right)}\]
    10. Applied simplify17.6

      \[\leadsto \left(\frac{\ell}{k} \cdot \frac{\ell}{k}\right) \cdot \color{blue}{\left(\frac{\cos k}{\sin k} \cdot \frac{\frac{2}{t}}{\sin k}\right)}\]
  3. Recombined 2 regimes into one program.

Runtime

Time bar (total: 2.4m)Debug logProfile

herbie shell --seed '#(1070258749 1877548225 2229079127 1588002776 3179087814 1886870650)' +o rules:numerics
(FPCore (t l k)
  :name "Toniolo and Linder, Equation (10-)"
  (/ 2 (* (* (* (/ (pow t 3) (* l l)) (sin k)) (tan k)) (- (+ 1 (pow (/ k t) 2)) 1))))