Average Error: 14.6 → 0.3
Time: 29.0s
Precision: 64
Internal Precision: 320
\[\left(\frac{\pi}{2} \cdot \frac{1}{b \cdot b - a \cdot a}\right) \cdot \left(\frac{1}{a} - \frac{1}{b}\right)\]
\[\frac{\frac{(\left(\frac{\pi}{2}\right) \cdot \left(\frac{-1}{b}\right) + \left(\frac{1}{\frac{a}{\frac{\pi}{2}}}\right))_*}{a + b}}{b - a}\]

Error

Bits error versus a

Bits error versus b

Derivation

  1. Initial program 14.6

    \[\left(\frac{\pi}{2} \cdot \frac{1}{b \cdot b - a \cdot a}\right) \cdot \left(\frac{1}{a} - \frac{1}{b}\right)\]
  2. Initial simplification9.7

    \[\leadsto \frac{(\left(\frac{\pi}{2}\right) \cdot \left(\frac{-1}{b}\right) + \left(\frac{\frac{\pi}{2}}{a}\right))_*}{\left(a + b\right) \cdot \left(b - a\right)}\]
  3. Using strategy rm
  4. Applied associate-/r*0.3

    \[\leadsto \color{blue}{\frac{\frac{(\left(\frac{\pi}{2}\right) \cdot \left(\frac{-1}{b}\right) + \left(\frac{\frac{\pi}{2}}{a}\right))_*}{a + b}}{b - a}}\]
  5. Using strategy rm
  6. Applied clear-num0.3

    \[\leadsto \frac{\frac{(\left(\frac{\pi}{2}\right) \cdot \left(\frac{-1}{b}\right) + \color{blue}{\left(\frac{1}{\frac{a}{\frac{\pi}{2}}}\right)})_*}{a + b}}{b - a}\]
  7. Final simplification0.3

    \[\leadsto \frac{\frac{(\left(\frac{\pi}{2}\right) \cdot \left(\frac{-1}{b}\right) + \left(\frac{1}{\frac{a}{\frac{\pi}{2}}}\right))_*}{a + b}}{b - a}\]

Runtime

Time bar (total: 29.0s)Debug logProfile

BaselineHerbieOracleSpan%
Regimes0.30.30.10.20%
herbie shell --seed 2018290 +o rules:numerics
(FPCore (a b)
  :name "NMSE Section 6.1 mentioned, B"
  (* (* (/ PI 2) (/ 1 (- (* b b) (* a a)))) (- (/ 1 a) (/ 1 b))))