Error

Target

Derivation

1. Split input into 2 regimes

2. if x < 1.4891429041068001e-282

   1. Initial program 1.6

      \[x \cdot e^{y \cdot \left(\log z - t\right) + a \cdot \left(\log \left(1.0 - z\right) - b\right)}\]

   2. Applied simplify18.6

      \[\leadsto \color{blue}{\left(x \cdot {\left(\frac{1.0 - z}{e^{b}}\right)}^{a}\right) \cdot {\left(\frac{z}{e^{t}}\right)}^{y}}\]
   3. Using strategy rm

   4. Applied add-exp-log18.6

      \[\leadsto \left(x \cdot {\left(\frac{\color{blue}{e^{\log \left(1.0 - z\right)}}}{e^{b}}\right)}^{a}\right) \cdot {\left(\frac{z}{e^{t}}\right)}^{y}\]

   5. Applied div-exp18.6

      \[\leadsto \left(x \cdot {\color{blue}{\left(e^{\log \left(1.0 - z\right) - b}\right)}}^{a}\right) \cdot {\left(\frac{z}{e^{t}}\right)}^{y}\]

   6. Applied pow-exp10.9

      \[\leadsto \left(x \cdot \color{blue}{e^{\left(\log \left(1.0 - z\right) - b\right) \cdot a}}\right) \cdot {\left(\frac{z}{e^{t}}\right)}^{y}\]
   7. Using strategy rm

   8. Applied add-exp-log10.9

      \[\leadsto \left(x \cdot e^{\left(\log \left(1.0 - z\right) - b\right) \cdot a}\right) \cdot {\color{blue}{\left(e^{\log \left(\frac{z}{e^{t}}\right)}\right)}}^{y}\]

   9. Applied pow-exp10.9

      \[\leadsto \left(x \cdot e^{\left(\log \left(1.0 - z\right) - b\right) \cdot a}\right) \cdot \color{blue}{e^{\log \left(\frac{z}{e^{t}}\right) \cdot y}}\]

   10. Applied simplify2.3

       \[\leadsto \left(x \cdot e^{\left(\log \left(1.0 - z\right) - b\right) \cdot a}\right) \cdot e^{\color{blue}{y \cdot \left(\log z - t\right)}}\]

   if 1.4891429041068001e-282 < x

   1. Initial program 2.0

      \[x \cdot e^{y \cdot \left(\log z - t\right) + a \cdot \left(\log \left(1.0 - z\right) - b\right)}\]

   2. Applied simplify22.4

      \[\leadsto \color{blue}{\left(x \cdot {\left(\frac{1.0 - z}{e^{b}}\right)}^{a}\right) \cdot {\left(\frac{z}{e^{t}}\right)}^{y}}\]
   3. Using strategy rm

   4. Applied add-exp-log22.4

      \[\leadsto \left(x \cdot {\left(\frac{1.0 - z}{e^{b}}\right)}^{a}\right) \cdot {\color{blue}{\left(e^{\log \left(\frac{z}{e^{t}}\right)}\right)}}^{y}\]

   5. Applied pow-exp22.4

      \[\leadsto \left(x \cdot {\left(\frac{1.0 - z}{e^{b}}\right)}^{a}\right) \cdot \color{blue}{e^{\log \left(\frac{z}{e^{t}}\right) \cdot y}}\]

   6. Applied add-exp-log23.2

      \[\leadsto \color{blue}{e^{\log \left(x \cdot {\left(\frac{1.0 - z}{e^{b}}\right)}^{a}\right)}} \cdot e^{\log \left(\frac{z}{e^{t}}\right) \cdot y}\]

   7. Applied prod-exp21.8

      \[\leadsto \color{blue}{e^{\log \left(x \cdot {\left(\frac{1.0 - z}{e^{b}}\right)}^{a}\right) + \log \left(\frac{z}{e^{t}}\right) \cdot y}}\]

   8. Applied simplify3.6

      \[\leadsto e^{\color{blue}{\left(\log x + \left(\log z - t\right) \cdot y\right) + a \cdot \left(\log \left(1.0 - z\right) - b\right)}}\]
3. Recombined 2 regimes into one program.
4. Removed slow pow expressions.

Runtime

Time bar (total: 4.8m)Debug log

herbie shell --seed '#(1567391828 2030694642 2833800258 828025724 3004380912 3532991858)' +o setup:early-exit
(FPCore (x y z t a b)
  :name "Numeric.SpecFunctions:incompleteBetaApprox from math-functions-0.1.5.2, B"

  :herbie-target
  (* x (exp (+ (* y (- (log z) t)) (* a (- (log (- 1.0 z)) b)))))

  (* x (exp (+ (* y (- (log z) t)) (* a (- (log (- 1.0 z)) b))))))