\[\frac{\tan^{-1}_* \frac{im}{re} \cdot \log base - \log \left(\sqrt{re \cdot re + im \cdot im}\right) \cdot 0}{\log base \cdot \log base + 0 \cdot 0}\]
Test:
math.log/2 on complex, imaginary part
Bits:
128 bits
Bits error versus re
Bits error versus im
Bits error versus base
Time: 9.5 s
Input Error: 15.2
Output Error: 0.6
Log: ⚲
Profile: 🕒
\(\frac{\log_* (1 + (e^{\tan^{-1}_* \frac{im}{re}} - 1)^*) - 0}{\log base}\)
  1. Started with
    \[\frac{\tan^{-1}_* \frac{im}{re} \cdot \log base - \log \left(\sqrt{re \cdot re + im \cdot im}\right) \cdot 0}{\log base \cdot \log base + 0 \cdot 0}\]
    15.2
  2. Applied simplify to get
    \[\color{red}{\frac{\tan^{-1}_* \frac{im}{re} \cdot \log base - \log \left(\sqrt{re \cdot re + im \cdot im}\right) \cdot 0}{\log base \cdot \log base + 0 \cdot 0}} \leadsto \color{blue}{\frac{\tan^{-1}_* \frac{im}{re} - 0}{\log base}}\]
    0.4
  3. Using strategy rm
    0.4
  4. Applied log1p-expm1-u to get
    \[\frac{\color{red}{\tan^{-1}_* \frac{im}{re}} - 0}{\log base} \leadsto \frac{\color{blue}{\log_* (1 + (e^{\tan^{-1}_* \frac{im}{re}} - 1)^*)} - 0}{\log base}\]
    0.6
  5. Removed slow pow expressions

Original test:


(lambda ((re default) (im default) (base default))
  #:name "math.log/2 on complex, imaginary part"
  (/ (- (* (atan2 im re) (log base)) (* (log (sqrt (+ (* re re) (* im im)))) 0)) (+ (* (log base) (log base)) (* 0 0))))