\[\frac{\log \left(\sqrt{re \cdot re + im \cdot im}\right) \cdot \log base + \tan^{-1}_* \frac{im}{re} \cdot 0}{\log base \cdot \log base + 0 \cdot 0}\]
Test:
math.log/2 on complex, real part
Bits:
128 bits
Bits error versus re
Bits error versus im
Bits error versus base
Time: 17.3 s
Input Error: 14.8
Output Error: 6.5
Log:
Profile: 🕒
\(\begin{cases} \frac{\log \left(-re\right)}{\log base} & \text{when } re \le -1.6640371f+08 \\ \frac{\left(\log base \cdot \log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right) + \log \left(\sqrt[3]{\sqrt{{im}^2 + re \cdot re}}\right) \cdot \left(\log base + \log base\right)\right) + 0}{\log base \cdot \log base} & \text{when } re \le 2.6814642f+12 \\ \frac{\log re}{\log base} & \text{otherwise} \end{cases}\)

    if re < -1.6640371f+08

    1. Started with
      \[\frac{\log \left(\sqrt{re \cdot re + im \cdot im}\right) \cdot \log base + \tan^{-1}_* \frac{im}{re} \cdot 0}{\log base \cdot \log base + 0 \cdot 0}\]
      22.7
    2. Applied simplify to get
      \[\color{red}{\frac{\log \left(\sqrt{re \cdot re + im \cdot im}\right) \cdot \log base + \tan^{-1}_* \frac{im}{re} \cdot 0}{\log base \cdot \log base + 0 \cdot 0}} \leadsto \color{blue}{\frac{\log base \cdot \log \left(\sqrt{{re}^2 + im \cdot im}\right) + 0}{\log base \cdot \log base}}\]
      22.7
    3. Applied taylor to get
      \[\frac{\log base \cdot \log \left(\sqrt{{re}^2 + im \cdot im}\right) + 0}{\log base \cdot \log base} \leadsto \frac{\log base \cdot \log \left(-1 \cdot re\right) + 0}{\log base \cdot \log base}\]
      0.4
    4. Taylor expanded around -inf to get
      \[\frac{\log base \cdot \log \color{red}{\left(-1 \cdot re\right)} + 0}{\log base \cdot \log base} \leadsto \frac{\log base \cdot \log \color{blue}{\left(-1 \cdot re\right)} + 0}{\log base \cdot \log base}\]
      0.4
    5. Applied simplify to get
      \[\color{red}{\frac{\log base \cdot \log \left(-1 \cdot re\right) + 0}{\log base \cdot \log base}} \leadsto \color{blue}{\frac{\log \left(-re\right)}{\log base}}\]
      0.4

    if -1.6640371f+08 < re < 2.6814642f+12

    1. Started with
      \[\frac{\log \left(\sqrt{re \cdot re + im \cdot im}\right) \cdot \log base + \tan^{-1}_* \frac{im}{re} \cdot 0}{\log base \cdot \log base + 0 \cdot 0}\]
      9.9
    2. Applied simplify to get
      \[\color{red}{\frac{\log \left(\sqrt{re \cdot re + im \cdot im}\right) \cdot \log base + \tan^{-1}_* \frac{im}{re} \cdot 0}{\log base \cdot \log base + 0 \cdot 0}} \leadsto \color{blue}{\frac{\log base \cdot \log \left(\sqrt{{re}^2 + im \cdot im}\right) + 0}{\log base \cdot \log base}}\]
      9.9
    3. Using strategy rm
      9.9
    4. Applied add-cube-cbrt to get
      \[\frac{\log base \cdot \log \color{red}{\left(\sqrt{{re}^2 + im \cdot im}\right)} + 0}{\log base \cdot \log base} \leadsto \frac{\log base \cdot \log \color{blue}{\left({\left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right)}^3\right)} + 0}{\log base \cdot \log base}\]
      9.9
    5. Using strategy rm
      9.9
    6. Applied cube-mult to get
      \[\frac{\log base \cdot \log \color{red}{\left({\left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right)}^3\right)} + 0}{\log base \cdot \log base} \leadsto \frac{\log base \cdot \log \color{blue}{\left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}} \cdot \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}} \cdot \sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right)\right)} + 0}{\log base \cdot \log base}\]
      9.9
    7. Applied log-prod to get
      \[\frac{\log base \cdot \color{red}{\log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}} \cdot \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}} \cdot \sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right)\right)} + 0}{\log base \cdot \log base} \leadsto \frac{\log base \cdot \color{blue}{\left(\log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right) + \log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}} \cdot \sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right)\right)} + 0}{\log base \cdot \log base}\]
      9.9
    8. Applied distribute-lft-in to get
      \[\frac{\color{red}{\log base \cdot \left(\log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right) + \log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}} \cdot \sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right)\right)} + 0}{\log base \cdot \log base} \leadsto \frac{\color{blue}{\left(\log base \cdot \log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right) + \log base \cdot \log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}} \cdot \sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right)\right)} + 0}{\log base \cdot \log base}\]
      9.9
    9. Applied simplify to get
      \[\frac{\left(\log base \cdot \log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right) + \color{red}{\log base \cdot \log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}} \cdot \sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right)}\right) + 0}{\log base \cdot \log base} \leadsto \frac{\left(\log base \cdot \log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right) + \color{blue}{\log \left(\sqrt[3]{\sqrt{im \cdot im + re \cdot re}}\right) \cdot \left(\log base + \log base\right)}\right) + 0}{\log base \cdot \log base}\]
      9.9
    10. Applied simplify to get
      \[\frac{\left(\log base \cdot \log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right) + \color{red}{\log \left(\sqrt[3]{\sqrt{im \cdot im + re \cdot re}}\right)} \cdot \left(\log base + \log base\right)\right) + 0}{\log base \cdot \log base} \leadsto \frac{\left(\log base \cdot \log \left(\sqrt[3]{\sqrt{{re}^2 + im \cdot im}}\right) + \color{blue}{\log \left(\sqrt[3]{\sqrt{{im}^2 + re \cdot re}}\right)} \cdot \left(\log base + \log base\right)\right) + 0}{\log base \cdot \log base}\]
      9.9

    if 2.6814642f+12 < re

    1. Started with
      \[\frac{\log \left(\sqrt{re \cdot re + im \cdot im}\right) \cdot \log base + \tan^{-1}_* \frac{im}{re} \cdot 0}{\log base \cdot \log base + 0 \cdot 0}\]
      25.1
    2. Applied simplify to get
      \[\color{red}{\frac{\log \left(\sqrt{re \cdot re + im \cdot im}\right) \cdot \log base + \tan^{-1}_* \frac{im}{re} \cdot 0}{\log base \cdot \log base + 0 \cdot 0}} \leadsto \color{blue}{\frac{\log base \cdot \log \left(\sqrt{{re}^2 + im \cdot im}\right) + 0}{\log base \cdot \log base}}\]
      25.1
    3. Applied taylor to get
      \[\frac{\log base \cdot \log \left(\sqrt{{re}^2 + im \cdot im}\right) + 0}{\log base \cdot \log base} \leadsto \frac{\log base \cdot \log re + 0}{\log base \cdot \log base}\]
      0.4
    4. Taylor expanded around inf to get
      \[\frac{\log base \cdot \log \color{red}{re} + 0}{\log base \cdot \log base} \leadsto \frac{\log base \cdot \log \color{blue}{re} + 0}{\log base \cdot \log base}\]
      0.4
    5. Applied simplify to get
      \[\color{red}{\frac{\log base \cdot \log re + 0}{\log base \cdot \log base}} \leadsto \color{blue}{\frac{\log re}{\log base}}\]
      0.4

  1. Removed slow pow expressions

Original test:


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