\[\sqrt{re \cdot re + im \cdot im}\]
Test:
math.abs on complex
Bits:
128 bits
Bits error versus re
Bits error versus im
Time: 5.8 s
Input Error: 29.0
Output Error: 13.9
Log:
Profile: 🕒
\(\begin{cases} -re & \text{when } re \le -8.533487505443716 \cdot 10^{+145} \\ \sqrt{{re}^2 + im \cdot im} & \text{when } re \le 3.751610550051807 \cdot 10^{+91} \\ \left|re\right| + \frac{im \cdot \frac{1}{2}}{\frac{re}{im}} & \text{otherwise} \end{cases}\)

    if re < -8.533487505443716e+145

    1. Started with
      \[\sqrt{re \cdot re + im \cdot im}\]
      57.1
    2. Applied simplify to get
      \[\color{red}{\sqrt{re \cdot re + im \cdot im}} \leadsto \color{blue}{\sqrt{{re}^2 + im \cdot im}}\]
      57.1
    3. Applied taylor to get
      \[\sqrt{{re}^2 + im \cdot im} \leadsto -1 \cdot re\]
      0
    4. Taylor expanded around -inf to get
      \[\color{red}{-1 \cdot re} \leadsto \color{blue}{-1 \cdot re}\]
      0
    5. Applied simplify to get
      \[\color{red}{-1 \cdot re} \leadsto \color{blue}{-re}\]
      0

    if -8.533487505443716e+145 < re < 3.751610550051807e+91

    1. Started with
      \[\sqrt{re \cdot re + im \cdot im}\]
      19.6
    2. Applied simplify to get
      \[\color{red}{\sqrt{re \cdot re + im \cdot im}} \leadsto \color{blue}{\sqrt{{re}^2 + im \cdot im}}\]
      19.6

    if 3.751610550051807e+91 < re

    1. Started with
      \[\sqrt{re \cdot re + im \cdot im}\]
      46.7
    2. Applied simplify to get
      \[\color{red}{\sqrt{re \cdot re + im \cdot im}} \leadsto \color{blue}{\sqrt{{re}^2 + im \cdot im}}\]
      46.7
    3. Using strategy rm
      46.7
    4. Applied add-exp-log to get
      \[\color{red}{\sqrt{{re}^2 + im \cdot im}} \leadsto \color{blue}{e^{\log \left(\sqrt{{re}^2 + im \cdot im}\right)}}\]
      47.9
    5. Using strategy rm
      47.9
    6. Applied pow1/2 to get
      \[e^{\log \color{red}{\left(\sqrt{{re}^2 + im \cdot im}\right)}} \leadsto e^{\log \color{blue}{\left({\left({re}^2 + im \cdot im\right)}^{\frac{1}{2}}\right)}}\]
      47.9
    7. Applied log-pow to get
      \[e^{\color{red}{\log \left({\left({re}^2 + im \cdot im\right)}^{\frac{1}{2}}\right)}} \leadsto e^{\color{blue}{\frac{1}{2} \cdot \log \left({re}^2 + im \cdot im\right)}}\]
      47.9
    8. Applied exp-prod to get
      \[\color{red}{e^{\frac{1}{2} \cdot \log \left({re}^2 + im \cdot im\right)}} \leadsto \color{blue}{{\left(e^{\frac{1}{2}}\right)}^{\left(\log \left({re}^2 + im \cdot im\right)\right)}}\]
      48.1
    9. Using strategy rm
      48.1
    10. Applied add-cube-cbrt to get
      \[{\left(e^{\frac{1}{2}}\right)}^{\color{red}{\left(\log \left({re}^2 + im \cdot im\right)\right)}} \leadsto {\left(e^{\frac{1}{2}}\right)}^{\color{blue}{\left({\left(\sqrt[3]{\log \left({re}^2 + im \cdot im\right)}\right)}^3\right)}}\]
      48.5
    11. Applied taylor to get
      \[{\left(e^{\frac{1}{2}}\right)}^{\left({\left(\sqrt[3]{\log \left({re}^2 + im \cdot im\right)}\right)}^3\right)} \leadsto {\left({re}^2\right)}^{\frac{1}{2}} + \frac{1}{2} \cdot \frac{{im}^2}{re}\]
      45.3
    12. Taylor expanded around 0 to get
      \[\color{red}{{\left({re}^2\right)}^{\frac{1}{2}} + \frac{1}{2} \cdot \frac{{im}^2}{re}} \leadsto \color{blue}{{\left({re}^2\right)}^{\frac{1}{2}} + \frac{1}{2} \cdot \frac{{im}^2}{re}}\]
      45.3
    13. Applied simplify to get
      \[{\left({re}^2\right)}^{\frac{1}{2}} + \frac{1}{2} \cdot \frac{{im}^2}{re} \leadsto \left|re\right| + \frac{im \cdot \frac{1}{2}}{\frac{re}{im}}\]
      0.0

    14. Applied final simplification

  1. Removed slow pow expressions

Original test:


(lambda ((re default) (im default))
  #:name "math.abs on complex"
  (sqrt (+ (* re re) (* im im))))