Jmat.Real.dawson

Average Error: 29.3 → 0.0

Time: 10.3s

Precision: binary64

Math

\[\frac{\left(\left(\left(\left(1 + 0.1049934947 \cdot \left(x \cdot x\right)\right) + 0.0424060604 \cdot \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0072644182 \cdot \left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0005064034 \cdot \left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0001789971 \cdot \left(\left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)}{\left(\left(\left(\left(\left(1 + 0.7715471019 \cdot \left(x \cdot x\right)\right) + 0.2909738639 \cdot \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0694555761 \cdot \left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0140005442 \cdot \left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0008327945 \cdot \left(\left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + \left(2 \cdot 0.0001789971\right) \cdot \left(\left(\left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)} \cdot x\]

↓

\[\begin{array}{l} \mathbf{if}\;x \leq -3.538392030426441 \cdot 10^{+16} \lor \neg \left(x \leq 711.3199125379759\right):\\ \;\;\;\;\frac{0.2514179000665374}{{x}^{3}} + \left(\frac{0.15298196345929152}{{x}^{5}} + \frac{0.5}{x}\right)\\ \mathbf{else}:\\ \;\;\;\;\left(x \cdot \left(\left(\left(\left(\left(1 + 0.1049934947 \cdot \left(x \cdot x\right)\right) + 0.0424060604 \cdot {x}^{4}\right) + 0.0072644182 \cdot {x}^{6}\right) + 0.0005064034 \cdot {x}^{8}\right) + 0.0001789971 \cdot {x}^{10}\right)\right) \cdot \frac{1}{\left(\left(\left(\left(\left(1 + \left(x \cdot x\right) \cdot 0.7715471019\right) + {x}^{4} \cdot 0.2909738639\right) + {x}^{6} \cdot 0.0694555761\right) + {x}^{8} \cdot 0.0140005442\right) + {x}^{10} \cdot 0.0008327945\right) + 0.0003579942 \cdot {x}^{12}}\\ \end{array}\]

FPCore

(FPCore (x)
 :precision binary64
 (*
  (/
   (+
    (+
     (+
      (+ (+ 1.0 (* 0.1049934947 (* x x))) (* 0.0424060604 (* (* x x) (* x x))))
      (* 0.0072644182 (* (* (* x x) (* x x)) (* x x))))
     (* 0.0005064034 (* (* (* (* x x) (* x x)) (* x x)) (* x x))))
    (* 0.0001789971 (* (* (* (* (* x x) (* x x)) (* x x)) (* x x)) (* x x))))
   (+
    (+
     (+
      (+
       (+
        (+ 1.0 (* 0.7715471019 (* x x)))
        (* 0.2909738639 (* (* x x) (* x x))))
       (* 0.0694555761 (* (* (* x x) (* x x)) (* x x))))
      (* 0.0140005442 (* (* (* (* x x) (* x x)) (* x x)) (* x x))))
     (* 0.0008327945 (* (* (* (* (* x x) (* x x)) (* x x)) (* x x)) (* x x))))
    (*
     (* 2.0 0.0001789971)
     (* (* (* (* (* (* x x) (* x x)) (* x x)) (* x x)) (* x x)) (* x x)))))
  x))

↓

(FPCore (x)
 :precision binary64
 (if (or (<= x -3.538392030426441e+16) (not (<= x 711.3199125379759)))
   (+
    (/ 0.2514179000665374 (pow x 3.0))
    (+ (/ 0.15298196345929152 (pow x 5.0)) (/ 0.5 x)))
   (*
    (*
     x
     (+
      (+
       (+
        (+ (+ 1.0 (* 0.1049934947 (* x x))) (* 0.0424060604 (pow x 4.0)))
        (* 0.0072644182 (pow x 6.0)))
       (* 0.0005064034 (pow x 8.0)))
      (* 0.0001789971 (pow x 10.0))))
    (/
     1.0
     (+
      (+
       (+
        (+
         (+ (+ 1.0 (* (* x x) 0.7715471019)) (* (pow x 4.0) 0.2909738639))
         (* (pow x 6.0) 0.0694555761))
        (* (pow x 8.0) 0.0140005442))
       (* (pow x 10.0) 0.0008327945))
      (* 0.0003579942 (pow x 12.0)))))))

C

double code(double x) {
	return ((((((1.0 + (0.1049934947 * (x * x))) + (0.0424060604 * ((x * x) * (x * x)))) + (0.0072644182 * (((x * x) * (x * x)) * (x * x)))) + (0.0005064034 * ((((x * x) * (x * x)) * (x * x)) * (x * x)))) + (0.0001789971 * (((((x * x) * (x * x)) * (x * x)) * (x * x)) * (x * x)))) / ((((((1.0 + (0.7715471019 * (x * x))) + (0.2909738639 * ((x * x) * (x * x)))) + (0.0694555761 * (((x * x) * (x * x)) * (x * x)))) + (0.0140005442 * ((((x * x) * (x * x)) * (x * x)) * (x * x)))) + (0.0008327945 * (((((x * x) * (x * x)) * (x * x)) * (x * x)) * (x * x)))) + ((2.0 * 0.0001789971) * ((((((x * x) * (x * x)) * (x * x)) * (x * x)) * (x * x)) * (x * x))))) * x;
}

↓

double code(double x) {
	double tmp;
	if ((x <= -3.538392030426441e+16) || !(x <= 711.3199125379759)) {
		tmp = (0.2514179000665374 / pow(x, 3.0)) + ((0.15298196345929152 / pow(x, 5.0)) + (0.5 / x));
	} else {
		tmp = (x * (((((1.0 + (0.1049934947 * (x * x))) + (0.0424060604 * pow(x, 4.0))) + (0.0072644182 * pow(x, 6.0))) + (0.0005064034 * pow(x, 8.0))) + (0.0001789971 * pow(x, 10.0)))) * (1.0 / ((((((1.0 + ((x * x) * 0.7715471019)) + (pow(x, 4.0) * 0.2909738639)) + (pow(x, 6.0) * 0.0694555761)) + (pow(x, 8.0) * 0.0140005442)) + (pow(x, 10.0) * 0.0008327945)) + (0.0003579942 * pow(x, 12.0))));
	}
	return tmp;
}

Error

Bits error versus x

Derivation

1. Split input into 2 regimes

2. if x < -35383920304264408 or 711.319912537975938 < x

   1. Initial program 60.6

      \[\frac{\left(\left(\left(\left(1 + 0.1049934947 \cdot \left(x \cdot x\right)\right) + 0.0424060604 \cdot \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0072644182 \cdot \left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0005064034 \cdot \left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0001789971 \cdot \left(\left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)}{\left(\left(\left(\left(\left(1 + 0.7715471019 \cdot \left(x \cdot x\right)\right) + 0.2909738639 \cdot \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0694555761 \cdot \left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0140005442 \cdot \left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0008327945 \cdot \left(\left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + \left(2 \cdot 0.0001789971\right) \cdot \left(\left(\left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)} \cdot x\]

   2. Simplified 60.6

      \[\leadsto \color{blue}{x \cdot \frac{\left(\left(\left(\left(1 + 0.1049934947 \cdot \left(x \cdot x\right)\right) + 0.0424060604 \cdot {x}^{4}\right) + 0.0072644182 \cdot {x}^{6}\right) + 0.0005064034 \cdot {x}^{8}\right) + 0.0001789971 \cdot {x}^{10}}{\left(\left(\left(\left(\left(1 + \left(x \cdot x\right) \cdot 0.7715471019\right) + {x}^{4} \cdot 0.2909738639\right) + {x}^{6} \cdot 0.0694555761\right) + {x}^{8} \cdot 0.0140005442\right) + {x}^{10} \cdot 0.0008327945\right) + 0.0003579942 \cdot {x}^{12}}}\]

   3. Taylor expanded around inf 0.0

      \[\leadsto \color{blue}{0.2514179000665374 \cdot \frac{1}{{x}^{3}} + \left(0.15298196345929152 \cdot \frac{1}{{x}^{5}} + 0.5 \cdot \frac{1}{x}\right)}\]

   4. Simplified 0.0

      \[\leadsto \color{blue}{\frac{0.2514179000665374}{{x}^{3}} + \left(\frac{0.15298196345929152}{{x}^{5}} + \frac{0.5}{x}\right)}\]

   if -35383920304264408 < x < 711.319912537975938

   1. Initial program 0.0

      \[\frac{\left(\left(\left(\left(1 + 0.1049934947 \cdot \left(x \cdot x\right)\right) + 0.0424060604 \cdot \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0072644182 \cdot \left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0005064034 \cdot \left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0001789971 \cdot \left(\left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)}{\left(\left(\left(\left(\left(1 + 0.7715471019 \cdot \left(x \cdot x\right)\right) + 0.2909738639 \cdot \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0694555761 \cdot \left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0140005442 \cdot \left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + 0.0008327945 \cdot \left(\left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)\right) + \left(2 \cdot 0.0001789971\right) \cdot \left(\left(\left(\left(\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right) \cdot \left(x \cdot x\right)\right)} \cdot x\]

   2. Simplified 0.0

      \[\leadsto \color{blue}{x \cdot \frac{\left(\left(\left(\left(1 + 0.1049934947 \cdot \left(x \cdot x\right)\right) + 0.0424060604 \cdot {x}^{4}\right) + 0.0072644182 \cdot {x}^{6}\right) + 0.0005064034 \cdot {x}^{8}\right) + 0.0001789971 \cdot {x}^{10}}{\left(\left(\left(\left(\left(1 + \left(x \cdot x\right) \cdot 0.7715471019\right) + {x}^{4} \cdot 0.2909738639\right) + {x}^{6} \cdot 0.0694555761\right) + {x}^{8} \cdot 0.0140005442\right) + {x}^{10} \cdot 0.0008327945\right) + 0.0003579942 \cdot {x}^{12}}}\]
   3. Using strategy rm

   4. Applied div-inv_binary64_591 0.0

      \[\leadsto x \cdot \color{blue}{\left(\left(\left(\left(\left(\left(1 + 0.1049934947 \cdot \left(x \cdot x\right)\right) + 0.0424060604 \cdot {x}^{4}\right) + 0.0072644182 \cdot {x}^{6}\right) + 0.0005064034 \cdot {x}^{8}\right) + 0.0001789971 \cdot {x}^{10}\right) \cdot \frac{1}{\left(\left(\left(\left(\left(1 + \left(x \cdot x\right) \cdot 0.7715471019\right) + {x}^{4} \cdot 0.2909738639\right) + {x}^{6} \cdot 0.0694555761\right) + {x}^{8} \cdot 0.0140005442\right) + {x}^{10} \cdot 0.0008327945\right) + 0.0003579942 \cdot {x}^{12}}\right)}\]

   5. Applied associate-*r*_binary64_649 0.0

      \[\leadsto \color{blue}{\left(x \cdot \left(\left(\left(\left(\left(1 + 0.1049934947 \cdot \left(x \cdot x\right)\right) + 0.0424060604 \cdot {x}^{4}\right) + 0.0072644182 \cdot {x}^{6}\right) + 0.0005064034 \cdot {x}^{8}\right) + 0.0001789971 \cdot {x}^{10}\right)\right) \cdot \frac{1}{\left(\left(\left(\left(\left(1 + \left(x \cdot x\right) \cdot 0.7715471019\right) + {x}^{4} \cdot 0.2909738639\right) + {x}^{6} \cdot 0.0694555761\right) + {x}^{8} \cdot 0.0140005442\right) + {x}^{10} \cdot 0.0008327945\right) + 0.0003579942 \cdot {x}^{12}}}\]
3. Recombined 2 regimes into one program.

4. Final simplification 0.0

   \[\leadsto \begin{array}{l} \mathbf{if}\;x \leq -3.538392030426441 \cdot 10^{+16} \lor \neg \left(x \leq 711.3199125379759\right):\\ \;\;\;\;\frac{0.2514179000665374}{{x}^{3}} + \left(\frac{0.15298196345929152}{{x}^{5}} + \frac{0.5}{x}\right)\\ \mathbf{else}:\\ \;\;\;\;\left(x \cdot \left(\left(\left(\left(\left(1 + 0.1049934947 \cdot \left(x \cdot x\right)\right) + 0.0424060604 \cdot {x}^{4}\right) + 0.0072644182 \cdot {x}^{6}\right) + 0.0005064034 \cdot {x}^{8}\right) + 0.0001789971 \cdot {x}^{10}\right)\right) \cdot \frac{1}{\left(\left(\left(\left(\left(1 + \left(x \cdot x\right) \cdot 0.7715471019\right) + {x}^{4} \cdot 0.2909738639\right) + {x}^{6} \cdot 0.0694555761\right) + {x}^{8} \cdot 0.0140005442\right) + {x}^{10} \cdot 0.0008327945\right) + 0.0003579942 \cdot {x}^{12}}\\ \end{array}\]

Reproduce

herbie shell --seed 2020232 
(FPCore (x)
  :name "Jmat.Real.dawson"
  :precision binary64
  (* (/ (+ (+ (+ (+ (+ 1.0 (* 0.1049934947 (* x x))) (* 0.0424060604 (* (* x x) (* x x)))) (* 0.0072644182 (* (* (* x x) (* x x)) (* x x)))) (* 0.0005064034 (* (* (* (* x x) (* x x)) (* x x)) (* x x)))) (* 0.0001789971 (* (* (* (* (* x x) (* x x)) (* x x)) (* x x)) (* x x)))) (+ (+ (+ (+ (+ (+ 1.0 (* 0.7715471019 (* x x))) (* 0.2909738639 (* (* x x) (* x x)))) (* 0.0694555761 (* (* (* x x) (* x x)) (* x x)))) (* 0.0140005442 (* (* (* (* x x) (* x x)) (* x x)) (* x x)))) (* 0.0008327945 (* (* (* (* (* x x) (* x x)) (* x x)) (* x x)) (* x x)))) (* (* 2.0 0.0001789971) (* (* (* (* (* (* x x) (* x x)) (* x x)) (* x x)) (* x x)) (* x x))))) x))