Average Error: 0.5 → 0.5
Time: 1.5m
Precision: 64
Internal precision: 128
\[\frac1{\sqrt{k}} \cdot {\left(\left(2 \cdot \pi\right) \cdot n\right)}^{\left(\frac{1 - k}{2}\right)}\]
\[\left(\frac1{\sqrt{k}} \cdot {\left(\sqrt{{\left(2 \cdot \pi\right)}^{\left(\frac{1 - k}{2}\right)}}\right)}^2\right) \cdot \frac{{n}^{\left(\frac{1}{2}\right)}}{{n}^{\left(\frac{k}{2}\right)}}\]

Error

Bits error versus k

Bits error versus n

Derivation

  1. Initial program 0.5

    \[\frac1{\sqrt{k}} \cdot {\left(\left(2 \cdot \pi\right) \cdot n\right)}^{\left(\frac{1 - k}{2}\right)}\]
  2. Using strategy rm
  3. Applied unpow-prod-down 0.6

    \[\leadsto \frac1{\sqrt{k}} \cdot \color{blue}{\left({\left(2 \cdot \pi\right)}^{\left(\frac{1 - k}{2}\right)} \cdot {n}^{\left(\frac{1 - k}{2}\right)}\right)}\]
  4. Applied associate-*r* 0.6

    \[\leadsto \color{blue}{\left(\frac1{\sqrt{k}} \cdot {\left(2 \cdot \pi\right)}^{\left(\frac{1 - k}{2}\right)}\right) \cdot {n}^{\left(\frac{1 - k}{2}\right)}}\]
  5. Using strategy rm
  6. Applied div-sub 0.6

    \[\leadsto \left(\frac1{\sqrt{k}} \cdot {\left(2 \cdot \pi\right)}^{\left(\frac{1 - k}{2}\right)}\right) \cdot {n}^{\color{blue}{\left(\frac{1}{2} - \frac{k}{2}\right)}}\]
  7. Applied pow-sub 0.5

    \[\leadsto \left(\frac1{\sqrt{k}} \cdot {\left(2 \cdot \pi\right)}^{\left(\frac{1 - k}{2}\right)}\right) \cdot \color{blue}{\frac{{n}^{\left(\frac{1}{2}\right)}}{{n}^{\left(\frac{k}{2}\right)}}}\]
  8. Using strategy rm
  9. Applied add-sqr-sqrt 0.5

    \[\leadsto \left(\frac1{\sqrt{k}} \cdot \color{blue}{{\left(\sqrt{{\left(2 \cdot \pi\right)}^{\left(\frac{1 - k}{2}\right)}}\right)}^2}\right) \cdot \frac{{n}^{\left(\frac{1}{2}\right)}}{{n}^{\left(\frac{k}{2}\right)}}\]
  10. Removed slow pow expressions

Runtime

Time bar (total: 1.5m) Debug log

Please include this information when filing a bug report:

herbie --seed '#(1034323934 74523573 869618197 17023241 2775577715 632123523)'
(FPCore (k n)
  :name "Migdal et al, Equation (51)"
  (* (/ (sqrt k)) (pow (* (* 2 PI) n) (/ (- 1 k) 2))))