Average Error: 17.7 → 0.1
Time: 7.7s
Precision: binary64
\[\left(J \cdot \left(e^{\ell} - e^{-\ell}\right)\right) \cdot \cos \left(\frac{K}{2}\right) + U \]
↓
\[2 \cdot \left(\sinh \ell \cdot \left(J \cdot \cos \left(\frac{K}{2}\right)\right)\right) + U \]
\left(J \cdot \left(e^{\ell} - e^{-\ell}\right)\right) \cdot \cos \left(\frac{K}{2}\right) + U
↓
2 \cdot \left(\sinh \ell \cdot \left(J \cdot \cos \left(\frac{K}{2}\right)\right)\right) + U

(FPCore (J l K U)
 :precision binary64
 (+ (* (* J (- (exp l) (exp (- l)))) (cos (/ K 2.0))) U))
↓
(FPCore (J l K U)
 :precision binary64
 (+ (* 2.0 (* (sinh l) (* J (cos (/ K 2.0))))) U))
double code(double J, double l, double K, double U) {
	return ((J * (exp(l) - exp(-l))) * cos(K / 2.0)) + U;
}
↓
double code(double J, double l, double K, double U) {
	return (2.0 * (sinh(l) * (J * cos(K / 2.0)))) + U;
}

Error

Bits error versus J

Bits error versus l

Bits error versus K

Bits error versus U

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 17.7

    \[\left(J \cdot \left(e^{\ell} - e^{-\ell}\right)\right) \cdot \cos \left(\frac{K}{2}\right) + U \]

  2. Simplified17.7

    \[\leadsto \color{blue}{\mathsf{fma}\left(J \cdot \left(e^{\ell} - e^{-\ell}\right), \cos \left(\frac{K}{2}\right), U\right)} \]

  3. Applied sinh-undef_binary640.1

    \[\leadsto \mathsf{fma}\left(J \cdot \color{blue}{\left(2 \cdot \sinh \ell\right)}, \cos \left(\frac{K}{2}\right), U\right) \]

  4. Applied fma-udef_binary640.1

    \[\leadsto \color{blue}{\left(J \cdot \left(2 \cdot \sinh \ell\right)\right) \cdot \cos \left(\frac{K}{2}\right) + U} \]

  5. Simplified0.1

    \[\leadsto \color{blue}{2 \cdot \left(\sinh \ell \cdot \left(J \cdot \cos \left(\frac{K}{2}\right)\right)\right)} + U \]

  6. Final simplification0.1

    \[\leadsto 2 \cdot \left(\sinh \ell \cdot \left(J \cdot \cos \left(\frac{K}{2}\right)\right)\right) + U \]

Reproduce

herbie shell --seed 2021280 
(FPCore (J l K U)
  :name "Maksimov and Kolovsky, Equation (4)"
  :precision binary64
  (+ (* (* J (- (exp l) (exp (- l)))) (cos (/ K 2.0))) U))