Average Error: 0.1 → 0.1
Time: 2.0m
Precision: 64
Internal Precision: 128
\[\left(\frac{m \cdot \left(1 - m\right)}{v} - 1\right) \cdot \left(1 - m\right)\]
\[\left(\left(-\left(\left(1 - m\right) \cdot m\right) \cdot \frac{m}{v}\right) - \left(1 - m\right)\right) + \left(1 - m\right) \cdot \frac{m}{v}\]

Error

Bits error versus m

Bits error versus v

Derivation

  1. Initial program 0.1

    \[\left(\frac{m \cdot \left(1 - m\right)}{v} - 1\right) \cdot \left(1 - m\right)\]
  2. Taylor expanded around -inf 0.1

    \[\leadsto \left(\frac{\color{blue}{m - {m}^{2}}}{v} - 1\right) \cdot \left(1 - m\right)\]
  3. Simplified0.1

    \[\leadsto \left(\frac{\color{blue}{m - m \cdot m}}{v} - 1\right) \cdot \left(1 - m\right)\]
  4. Using strategy rm
  5. Applied pow10.1

    \[\leadsto \left(\frac{m - m \cdot m}{v} - 1\right) \cdot \color{blue}{{\left(1 - m\right)}^{1}}\]
  6. Applied pow10.1

    \[\leadsto \color{blue}{{\left(\frac{m - m \cdot m}{v} - 1\right)}^{1}} \cdot {\left(1 - m\right)}^{1}\]
  7. Applied pow-prod-down0.1

    \[\leadsto \color{blue}{{\left(\left(\frac{m - m \cdot m}{v} - 1\right) \cdot \left(1 - m\right)\right)}^{1}}\]
  8. Simplified0.1

    \[\leadsto {\color{blue}{\left(\frac{m}{v} \cdot \left(\left(1 - m\right) \cdot \left(1 - m\right)\right) - \left(1 - m\right)\right)}}^{1}\]
  9. Using strategy rm
  10. Applied sub-neg0.1

    \[\leadsto {\left(\frac{m}{v} \cdot \left(\left(1 - m\right) \cdot \color{blue}{\left(1 + \left(-m\right)\right)}\right) - \left(1 - m\right)\right)}^{1}\]
  11. Applied distribute-rgt-in0.1

    \[\leadsto {\left(\frac{m}{v} \cdot \color{blue}{\left(1 \cdot \left(1 - m\right) + \left(-m\right) \cdot \left(1 - m\right)\right)} - \left(1 - m\right)\right)}^{1}\]
  12. Applied distribute-rgt-in0.1

    \[\leadsto {\left(\color{blue}{\left(\left(1 \cdot \left(1 - m\right)\right) \cdot \frac{m}{v} + \left(\left(-m\right) \cdot \left(1 - m\right)\right) \cdot \frac{m}{v}\right)} - \left(1 - m\right)\right)}^{1}\]
  13. Applied associate--l+0.1

    \[\leadsto {\color{blue}{\left(\left(1 \cdot \left(1 - m\right)\right) \cdot \frac{m}{v} + \left(\left(\left(-m\right) \cdot \left(1 - m\right)\right) \cdot \frac{m}{v} - \left(1 - m\right)\right)\right)}}^{1}\]
  14. Final simplification0.1

    \[\leadsto \left(\left(-\left(\left(1 - m\right) \cdot m\right) \cdot \frac{m}{v}\right) - \left(1 - m\right)\right) + \left(1 - m\right) \cdot \frac{m}{v}\]

Reproduce

herbie shell --seed 2019089 
(FPCore (m v)
  :name "b parameter of renormalized beta distribution"
  :pre (and (< 0 m) (< 0 v) (< v 0.25))
  (* (- (/ (* m (- 1 m)) v) 1) (- 1 m)))