Diagrams.Solve.Polynomial:cubForm from diagrams-solve-0.1, K

Average Error: 20.7 → 18.0

Time: 22.4s

Precision: binary64

Math

\[\left(2 \cdot \sqrt{x}\right) \cdot \cos \left(y - \frac{z \cdot t}{3}\right) - \frac{a}{b \cdot 3}\]

↓

\[\begin{array}{l} \mathbf{if}\;\cos \left(y - \frac{z \cdot t}{3}\right) \le 0.99998537075747429:\\ \;\;\;\;\left(2 \cdot \sqrt{x}\right) \cdot \left(\cos y \cdot \cos \left(\frac{\frac{z \cdot t}{\sqrt{3}}}{\sqrt{3}}\right) + \sin y \cdot \sin \left(\frac{\frac{z}{\sqrt[3]{\sqrt{3}} \cdot \sqrt[3]{\sqrt{3}}}}{\sqrt[3]{3}} \cdot \frac{\frac{t}{\sqrt[3]{\sqrt{3}}}}{\sqrt[3]{\sqrt{3}}}\right)\right) - \frac{a}{b \cdot 3}\\ \mathbf{else}:\\ \;\;\;\;\left(2 \cdot \sqrt{x}\right) \cdot \left(1 - \frac{1}{2} \cdot {y}^{2}\right) - \frac{a}{b \cdot 3}\\ \end{array}\]

C

double code(double x, double y, double z, double t, double a, double b) {
	return ((double) (((double) (((double) (2.0 * ((double) sqrt(x)))) * ((double) cos(((double) (y - ((double) (((double) (z * t)) / 3.0)))))))) - ((double) (a / ((double) (b * 3.0))))));
}

↓

double code(double x, double y, double z, double t, double a, double b) {
	double VAR;
	if ((((double) cos(((double) (y - ((double) (((double) (z * t)) / 3.0)))))) <= 0.9999853707574743)) {
		VAR = ((double) (((double) (((double) (2.0 * ((double) sqrt(x)))) * ((double) (((double) (((double) cos(y)) * ((double) cos(((double) (((double) (((double) (z * t)) / ((double) sqrt(3.0)))) / ((double) sqrt(3.0)))))))) + ((double) (((double) sin(y)) * ((double) sin(((double) (((double) (((double) (z / ((double) (((double) cbrt(((double) sqrt(3.0)))) * ((double) cbrt(((double) sqrt(3.0)))))))) / ((double) cbrt(3.0)))) * ((double) (((double) (t / ((double) cbrt(((double) sqrt(3.0)))))) / ((double) cbrt(((double) sqrt(3.0)))))))))))))))) - ((double) (a / ((double) (b * 3.0))))));
	} else {
		VAR = ((double) (((double) (((double) (2.0 * ((double) sqrt(x)))) * ((double) (1.0 - ((double) (0.5 * ((double) pow(y, 2.0)))))))) - ((double) (a / ((double) (b * 3.0))))));
	}
	return VAR;
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Bits error versus t

Bits error versus a

Bits error versus b

Target

Original	20.7
Target	18.5
Herbie	18.0

\[\begin{array}{l} \mathbf{if}\;z \lt -1.379333748723514 \cdot 10^{129}:\\ \;\;\;\;\left(2 \cdot \sqrt{x}\right) \cdot \cos \left(\frac{1}{y} - \frac{\frac{0.333333333333333315}{z}}{t}\right) - \frac{\frac{a}{3}}{b}\\ \mathbf{elif}\;z \lt 3.51629061355598715 \cdot 10^{106}:\\ \;\;\;\;\left(\sqrt{x} \cdot 2\right) \cdot \cos \left(y - \frac{t}{3} \cdot z\right) - \frac{\frac{a}{3}}{b}\\ \mathbf{else}:\\ \;\;\;\;\cos \left(y - \frac{\frac{0.333333333333333315}{z}}{t}\right) \cdot \left(2 \cdot \sqrt{x}\right) - \frac{\frac{a}{b}}{3}\\ \end{array}\]

Derivation

1. Split input into 2 regimes

2. if (cos (- y (/ (* z t) 3.0))) < 0.99998537075747429

   1. Initial program 19.6

      \[\left(2 \cdot \sqrt{x}\right) \cdot \cos \left(y - \frac{z \cdot t}{3}\right) - \frac{a}{b \cdot 3}\]
   2. Using strategy rm

   3. Applied add-sqr-sqrt 19.6

      \[\leadsto \left(2 \cdot \sqrt{x}\right) \cdot \cos \left(y - \frac{z \cdot t}{\color{blue}{\sqrt{3} \cdot \sqrt{3}}}\right) - \frac{a}{b \cdot 3}\]

   4. Applied associate-/r* 19.6

      \[\leadsto \left(2 \cdot \sqrt{x}\right) \cdot \cos \left(y - \color{blue}{\frac{\frac{z \cdot t}{\sqrt{3}}}{\sqrt{3}}}\right) - \frac{a}{b \cdot 3}\]
   5. Using strategy rm

   6. Applied cos-diff 19.0

      \[\leadsto \left(2 \cdot \sqrt{x}\right) \cdot \color{blue}{\left(\cos y \cdot \cos \left(\frac{\frac{z \cdot t}{\sqrt{3}}}{\sqrt{3}}\right) + \sin y \cdot \sin \left(\frac{\frac{z \cdot t}{\sqrt{3}}}{\sqrt{3}}\right)\right)} - \frac{a}{b \cdot 3}\]
   7. Using strategy rm

   8. Applied add-cube-cbrt 19.0

      \[\leadsto \left(2 \cdot \sqrt{x}\right) \cdot \left(\cos y \cdot \cos \left(\frac{\frac{z \cdot t}{\sqrt{3}}}{\sqrt{3}}\right) + \sin y \cdot \sin \left(\frac{\frac{z \cdot t}{\sqrt{3}}}{\color{blue}{\left(\sqrt[3]{\sqrt{3}} \cdot \sqrt[3]{\sqrt{3}}\right) \cdot \sqrt[3]{\sqrt{3}}}}\right)\right) - \frac{a}{b \cdot 3}\]

   9. Applied add-cube-cbrt 19.0

      \[\leadsto \left(2 \cdot \sqrt{x}\right) \cdot \left(\cos y \cdot \cos \left(\frac{\frac{z \cdot t}{\sqrt{3}}}{\sqrt{3}}\right) + \sin y \cdot \sin \left(\frac{\frac{z \cdot t}{\color{blue}{\left(\sqrt[3]{\sqrt{3}} \cdot \sqrt[3]{\sqrt{3}}\right) \cdot \sqrt[3]{\sqrt{3}}}}}{\left(\sqrt[3]{\sqrt{3}} \cdot \sqrt[3]{\sqrt{3}}\right) \cdot \sqrt[3]{\sqrt{3}}}\right)\right) - \frac{a}{b \cdot 3}\]

   10. Applied times-frac 19.0

       \[\leadsto \left(2 \cdot \sqrt{x}\right) \cdot \left(\cos y \cdot \cos \left(\frac{\frac{z \cdot t}{\sqrt{3}}}{\sqrt{3}}\right) + \sin y \cdot \sin \left(\frac{\color{blue}{\frac{z}{\sqrt[3]{\sqrt{3}} \cdot \sqrt[3]{\sqrt{3}}} \cdot \frac{t}{\sqrt[3]{\sqrt{3}}}}}{\left(\sqrt[3]{\sqrt{3}} \cdot \sqrt[3]{\sqrt{3}}\right) \cdot \sqrt[3]{\sqrt{3}}}\right)\right) - \frac{a}{b \cdot 3}\]

   11. Applied times-frac 19.1

       \[\leadsto \left(2 \cdot \sqrt{x}\right) \cdot \left(\cos y \cdot \cos \left(\frac{\frac{z \cdot t}{\sqrt{3}}}{\sqrt{3}}\right) + \sin y \cdot \sin \color{blue}{\left(\frac{\frac{z}{\sqrt[3]{\sqrt{3}} \cdot \sqrt[3]{\sqrt{3}}}}{\sqrt[3]{\sqrt{3}} \cdot \sqrt[3]{\sqrt{3}}} \cdot \frac{\frac{t}{\sqrt[3]{\sqrt{3}}}}{\sqrt[3]{\sqrt{3}}}\right)}\right) - \frac{a}{b \cdot 3}\]
   12. Using strategy rm

   13. Applied cbrt-unprod 19.1

       \[\leadsto \left(2 \cdot \sqrt{x}\right) \cdot \left(\cos y \cdot \cos \left(\frac{\frac{z \cdot t}{\sqrt{3}}}{\sqrt{3}}\right) + \sin y \cdot \sin \left(\frac{\frac{z}{\sqrt[3]{\sqrt{3}} \cdot \sqrt[3]{\sqrt{3}}}}{\color{blue}{\sqrt[3]{\sqrt{3} \cdot \sqrt{3}}}} \cdot \frac{\frac{t}{\sqrt[3]{\sqrt{3}}}}{\sqrt[3]{\sqrt{3}}}\right)\right) - \frac{a}{b \cdot 3}\]

   14. Simplified 19.0

       \[\leadsto \left(2 \cdot \sqrt{x}\right) \cdot \left(\cos y \cdot \cos \left(\frac{\frac{z \cdot t}{\sqrt{3}}}{\sqrt{3}}\right) + \sin y \cdot \sin \left(\frac{\frac{z}{\sqrt[3]{\sqrt{3}} \cdot \sqrt[3]{\sqrt{3}}}}{\sqrt[3]{\color{blue}{3}}} \cdot \frac{\frac{t}{\sqrt[3]{\sqrt{3}}}}{\sqrt[3]{\sqrt{3}}}\right)\right) - \frac{a}{b \cdot 3}\]

   if 0.99998537075747429 < (cos (- y (/ (* z t) 3.0)))

   1. Initial program 22.5

      \[\left(2 \cdot \sqrt{x}\right) \cdot \cos \left(y - \frac{z \cdot t}{3}\right) - \frac{a}{b \cdot 3}\]

   2. Taylor expanded around 0 16.4

      \[\leadsto \left(2 \cdot \sqrt{x}\right) \cdot \color{blue}{\left(1 - \frac{1}{2} \cdot {y}^{2}\right)} - \frac{a}{b \cdot 3}\]
3. Recombined 2 regimes into one program.

4. Final simplification 18.0

   \[\leadsto \begin{array}{l} \mathbf{if}\;\cos \left(y - \frac{z \cdot t}{3}\right) \le 0.99998537075747429:\\ \;\;\;\;\left(2 \cdot \sqrt{x}\right) \cdot \left(\cos y \cdot \cos \left(\frac{\frac{z \cdot t}{\sqrt{3}}}{\sqrt{3}}\right) + \sin y \cdot \sin \left(\frac{\frac{z}{\sqrt[3]{\sqrt{3}} \cdot \sqrt[3]{\sqrt{3}}}}{\sqrt[3]{3}} \cdot \frac{\frac{t}{\sqrt[3]{\sqrt{3}}}}{\sqrt[3]{\sqrt{3}}}\right)\right) - \frac{a}{b \cdot 3}\\ \mathbf{else}:\\ \;\;\;\;\left(2 \cdot \sqrt{x}\right) \cdot \left(1 - \frac{1}{2} \cdot {y}^{2}\right) - \frac{a}{b \cdot 3}\\ \end{array}\]

Reproduce

herbie shell --seed 2020152 
(FPCore (x y z t a b)
  :name "Diagrams.Solve.Polynomial:cubForm  from diagrams-solve-0.1, K"
  :precision binary64

  :herbie-target
  (if (< z -1.3793337487235141e+129) (- (* (* 2.0 (sqrt x)) (cos (- (/ 1.0 y) (/ (/ 0.3333333333333333 z) t)))) (/ (/ a 3.0) b)) (if (< z 3.516290613555987e+106) (- (* (* (sqrt x) 2.0) (cos (- y (* (/ t 3.0) z)))) (/ (/ a 3.0) b)) (- (* (cos (- y (/ (/ 0.3333333333333333 z) t))) (* 2.0 (sqrt x))) (/ (/ a b) 3.0))))

  (- (* (* 2.0 (sqrt x)) (cos (- y (/ (* z t) 3.0)))) (/ a (* b 3.0))))