Average Error: 0.4 → 0.4
Time: 1.2m
Precision: 64
Internal Precision: 576
\[\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5\]
\[\sqrt{\frac{1}{6}} \cdot \left(\left(\cos \left(\left(u2 \cdot \pi\right) \cdot 2\right) \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \sqrt{\frac{1}{6}}\right) + 0.5\]

Error

Bits error versus u1

Bits error versus u2

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Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 0.4

    \[\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5\]
  2. Initial simplification0.3

    \[\leadsto 0.5 + \frac{{\left(-2 \cdot \log u1\right)}^{0.5}}{\frac{6}{\cos \left(\left(2 \cdot u2\right) \cdot \pi\right)}}\]
  3. Using strategy rm
  4. Applied div-inv0.3

    \[\leadsto 0.5 + \frac{{\left(-2 \cdot \log u1\right)}^{0.5}}{\color{blue}{6 \cdot \frac{1}{\cos \left(\left(2 \cdot u2\right) \cdot \pi\right)}}}\]
  5. Applied *-un-lft-identity0.3

    \[\leadsto 0.5 + \frac{\color{blue}{1 \cdot {\left(-2 \cdot \log u1\right)}^{0.5}}}{6 \cdot \frac{1}{\cos \left(\left(2 \cdot u2\right) \cdot \pi\right)}}\]
  6. Applied times-frac0.4

    \[\leadsto 0.5 + \color{blue}{\frac{1}{6} \cdot \frac{{\left(-2 \cdot \log u1\right)}^{0.5}}{\frac{1}{\cos \left(\left(2 \cdot u2\right) \cdot \pi\right)}}}\]
  7. Simplified0.4

    \[\leadsto 0.5 + \frac{1}{6} \cdot \color{blue}{\left(\cos \left(\left(u2 \cdot \pi\right) \cdot 2\right) \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right)}\]
  8. Using strategy rm
  9. Applied add-sqr-sqrt0.4

    \[\leadsto 0.5 + \color{blue}{\left(\sqrt{\frac{1}{6}} \cdot \sqrt{\frac{1}{6}}\right)} \cdot \left(\cos \left(\left(u2 \cdot \pi\right) \cdot 2\right) \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right)\]
  10. Applied associate-*l*0.4

    \[\leadsto 0.5 + \color{blue}{\sqrt{\frac{1}{6}} \cdot \left(\sqrt{\frac{1}{6}} \cdot \left(\cos \left(\left(u2 \cdot \pi\right) \cdot 2\right) \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right)\right)}\]
  11. Final simplification0.4

    \[\leadsto \sqrt{\frac{1}{6}} \cdot \left(\left(\cos \left(\left(u2 \cdot \pi\right) \cdot 2\right) \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \sqrt{\frac{1}{6}}\right) + 0.5\]

Runtime

Time bar (total: 1.2m)Debug logProfile

herbie shell --seed 2018234 
(FPCore (u1 u2)
  :name "normal distribution"
  :pre (and (<= 0 u1 1) (<= 0 u2 1))
  (+ (* (* (/ 1 6) (pow (* -2 (log u1)) 0.5)) (cos (* (* 2 PI) u2))) 0.5))