Average Error: 32.3 → 3.8
Time: 1.3m
Precision: 64
Internal Precision: 576
\[\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) + 1\right)}\]
\[\begin{array}{l} \mathbf{if}\;t \le -1.2528181142958512 \cdot 10^{+80} \lor \neg \left(t \le 5.30663902755998 \cdot 10^{+49}\right):\\ \;\;\;\;\frac{2}{\frac{\sin k}{\frac{\ell}{t}} \cdot \left(\frac{t}{\ell} \cdot \left(t \cdot (\left((\left(\frac{k}{t}\right) \cdot \left(\frac{k}{t}\right) + 1)_*\right) \cdot \left(\tan k\right) + \left(\tan k\right))_*\right)\right)}\\ \mathbf{else}:\\ \;\;\;\;\frac{2}{\left(\sin k \cdot \frac{\sin k}{\ell}\right) \cdot \left(\frac{{t}^{3}}{\frac{\ell}{2}} + \frac{k \cdot t}{\frac{\ell}{k}}\right)} \cdot \cos k\\ \end{array}\]

Error

Bits error versus t

Bits error versus l

Bits error versus k

Derivation

  1. Split input into 2 regimes
  2. if t < -1.2528181142958512e+80 or 5.30663902755998e+49 < t

    1. Initial program 22.7

      \[\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) + 1\right)}\]
    2. Initial simplification6.2

      \[\leadsto \frac{2}{\frac{\sin k \cdot t}{\frac{\ell}{t} \cdot \frac{\ell}{t}} \cdot (\left((\left(\frac{k}{t}\right) \cdot \left(\frac{k}{t}\right) + 1)_*\right) \cdot \left(\tan k\right) + \left(\tan k\right))_*}\]
    3. Using strategy rm
    4. Applied times-frac7.0

      \[\leadsto \frac{2}{\color{blue}{\left(\frac{\sin k}{\frac{\ell}{t}} \cdot \frac{t}{\frac{\ell}{t}}\right)} \cdot (\left((\left(\frac{k}{t}\right) \cdot \left(\frac{k}{t}\right) + 1)_*\right) \cdot \left(\tan k\right) + \left(\tan k\right))_*}\]
    5. Applied associate-*l*6.6

      \[\leadsto \frac{2}{\color{blue}{\frac{\sin k}{\frac{\ell}{t}} \cdot \left(\frac{t}{\frac{\ell}{t}} \cdot (\left((\left(\frac{k}{t}\right) \cdot \left(\frac{k}{t}\right) + 1)_*\right) \cdot \left(\tan k\right) + \left(\tan k\right))_*\right)}}\]
    6. Using strategy rm
    7. Applied associate-/r/6.6

      \[\leadsto \frac{2}{\frac{\sin k}{\frac{\ell}{t}} \cdot \left(\color{blue}{\left(\frac{t}{\ell} \cdot t\right)} \cdot (\left((\left(\frac{k}{t}\right) \cdot \left(\frac{k}{t}\right) + 1)_*\right) \cdot \left(\tan k\right) + \left(\tan k\right))_*\right)}\]
    8. Applied associate-*l*2.1

      \[\leadsto \frac{2}{\frac{\sin k}{\frac{\ell}{t}} \cdot \color{blue}{\left(\frac{t}{\ell} \cdot \left(t \cdot (\left((\left(\frac{k}{t}\right) \cdot \left(\frac{k}{t}\right) + 1)_*\right) \cdot \left(\tan k\right) + \left(\tan k\right))_*\right)\right)}}\]

    if -1.2528181142958512e+80 < t < 5.30663902755998e+49

    1. Initial program 41.8

      \[\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) + 1\right)}\]
    2. Initial simplification32.2

      \[\leadsto \frac{2}{\frac{\sin k \cdot t}{\frac{\ell}{t} \cdot \frac{\ell}{t}} \cdot (\left((\left(\frac{k}{t}\right) \cdot \left(\frac{k}{t}\right) + 1)_*\right) \cdot \left(\tan k\right) + \left(\tan k\right))_*}\]
    3. Using strategy rm
    4. Applied times-frac28.8

      \[\leadsto \frac{2}{\color{blue}{\left(\frac{\sin k}{\frac{\ell}{t}} \cdot \frac{t}{\frac{\ell}{t}}\right)} \cdot (\left((\left(\frac{k}{t}\right) \cdot \left(\frac{k}{t}\right) + 1)_*\right) \cdot \left(\tan k\right) + \left(\tan k\right))_*}\]
    5. Applied associate-*l*24.6

      \[\leadsto \frac{2}{\color{blue}{\frac{\sin k}{\frac{\ell}{t}} \cdot \left(\frac{t}{\frac{\ell}{t}} \cdot (\left((\left(\frac{k}{t}\right) \cdot \left(\frac{k}{t}\right) + 1)_*\right) \cdot \left(\tan k\right) + \left(\tan k\right))_*\right)}}\]
    6. Taylor expanded around -inf 16.0

      \[\leadsto \frac{2}{\frac{\sin k}{\frac{\ell}{t}} \cdot \color{blue}{\left(2 \cdot \frac{{t}^{2} \cdot \sin k}{\ell \cdot \cos k} + \frac{\sin k \cdot {k}^{2}}{\cos k \cdot \ell}\right)}}\]
    7. Simplified11.6

      \[\leadsto \frac{2}{\frac{\sin k}{\frac{\ell}{t}} \cdot \color{blue}{\left((2 \cdot \left(\frac{t}{\ell} \cdot t\right) + \left(k \cdot \frac{k}{\ell}\right))_* \cdot \frac{\sin k}{\cos k}\right)}}\]
    8. Using strategy rm
    9. Applied associate-*r/11.6

      \[\leadsto \frac{2}{\frac{\sin k}{\frac{\ell}{t}} \cdot \color{blue}{\frac{(2 \cdot \left(\frac{t}{\ell} \cdot t\right) + \left(k \cdot \frac{k}{\ell}\right))_* \cdot \sin k}{\cos k}}}\]
    10. Applied associate-*r/11.6

      \[\leadsto \frac{2}{\color{blue}{\frac{\frac{\sin k}{\frac{\ell}{t}} \cdot \left((2 \cdot \left(\frac{t}{\ell} \cdot t\right) + \left(k \cdot \frac{k}{\ell}\right))_* \cdot \sin k\right)}{\cos k}}}\]
    11. Applied associate-/r/11.6

      \[\leadsto \color{blue}{\frac{2}{\frac{\sin k}{\frac{\ell}{t}} \cdot \left((2 \cdot \left(\frac{t}{\ell} \cdot t\right) + \left(k \cdot \frac{k}{\ell}\right))_* \cdot \sin k\right)} \cdot \cos k}\]
    12. Taylor expanded around -inf 32.0

      \[\leadsto \frac{2}{\color{blue}{2 \cdot \frac{{t}^{3} \cdot {\left(\sin k\right)}^{2}}{{\ell}^{2}} + \frac{t \cdot \left({\left(\sin k\right)}^{2} \cdot {k}^{2}\right)}{{\ell}^{2}}}} \cdot \cos k\]
    13. Simplified5.6

      \[\leadsto \frac{2}{\color{blue}{\left(\frac{\sin k}{\ell} \cdot \sin k\right) \cdot \left(\frac{t \cdot k}{\frac{\ell}{k}} + \frac{{t}^{3}}{\frac{\ell}{2}}\right)}} \cdot \cos k\]
  3. Recombined 2 regimes into one program.
  4. Final simplification3.8

    \[\leadsto \begin{array}{l} \mathbf{if}\;t \le -1.2528181142958512 \cdot 10^{+80} \lor \neg \left(t \le 5.30663902755998 \cdot 10^{+49}\right):\\ \;\;\;\;\frac{2}{\frac{\sin k}{\frac{\ell}{t}} \cdot \left(\frac{t}{\ell} \cdot \left(t \cdot (\left((\left(\frac{k}{t}\right) \cdot \left(\frac{k}{t}\right) + 1)_*\right) \cdot \left(\tan k\right) + \left(\tan k\right))_*\right)\right)}\\ \mathbf{else}:\\ \;\;\;\;\frac{2}{\left(\sin k \cdot \frac{\sin k}{\ell}\right) \cdot \left(\frac{{t}^{3}}{\frac{\ell}{2}} + \frac{k \cdot t}{\frac{\ell}{k}}\right)} \cdot \cos k\\ \end{array}\]

Runtime

Time bar (total: 1.3m)Debug logProfile

herbie shell --seed 2018230 +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))))