\[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
Test:
NMSE problem 3.3.4
Bits:
128 bits
Bits error versus x
Time: 3.2 m
Input Error: 1.1
Output Error: 13.2
Log:
Profile: 🕒
\(\begin{cases} e^{\log \left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\right)} & \text{when } x \le 19436852.0f0 \\ e^{\left(\log \left(\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}\right) - \frac{\frac{1}{9}}{\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}} \cdot \sqrt[3]{\frac{1}{{x}^{7}}}\right) + \left(\frac{\frac{1}{3}}{\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}} \cdot \sqrt[3]{\frac{1}{{x}^{4}}} - \frac{\sqrt[3]{\frac{1}{{x}^{8}}} \cdot \frac{1}{18}}{{\left(\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}\right)}^2}\right)} & \text{otherwise} \end{cases}\)

    if x < 19436852.0f0

    1. Started with
      \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
      1.9
    2. Using strategy rm
      1.9
    3. Applied add-exp-log to get
      \[\color{red}{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}} \leadsto \color{blue}{e^{\log \left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\right)}}\]
      1.9

    if 19436852.0f0 < x

    1. Started with
      \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
      0.0
    2. Using strategy rm
      0.0
    3. Applied add-exp-log to get
      \[\color{red}{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}} \leadsto \color{blue}{e^{\log \left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\right)}}\]
      0.0
    4. Using strategy rm
      0.0
    5. Applied add-sqr-sqrt to get
      \[e^{\log \left(\color{red}{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} - {x}^{\left(\frac{1}{3}\right)}\right)} \leadsto e^{\log \left(\color{blue}{{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^2} - {x}^{\left(\frac{1}{3}\right)}\right)}\]
      30.5
    6. Applied taylor to get
      \[e^{\log \left({\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^2 - {x}^{\left(\frac{1}{3}\right)}\right)} \leadsto e^{\left(\frac{1}{3} \cdot \left({\left(\frac{1}{{x}^{4}}\right)}^{\frac{1}{3}} \cdot \frac{1}{{\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}}\right) + \log \left({\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}\right)\right) - \left(\frac{1}{18} \cdot \left({\left(\frac{1}{{x}^{8}}\right)}^{\frac{1}{3}} \cdot \frac{1}{{\left({\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}\right)}^2}\right) + \frac{1}{9} \cdot \left({\left(\frac{1}{{x}^{7}}\right)}^{\frac{1}{3}} \cdot \frac{1}{{\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}}\right)\right)}\]
      30.9
    7. Taylor expanded around inf to get
      \[e^{\color{red}{\left(\frac{1}{3} \cdot \left({\left(\frac{1}{{x}^{4}}\right)}^{\frac{1}{3}} \cdot \frac{1}{{\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}}\right) + \log \left({\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}\right)\right) - \left(\frac{1}{18} \cdot \left({\left(\frac{1}{{x}^{8}}\right)}^{\frac{1}{3}} \cdot \frac{1}{{\left({\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}\right)}^2}\right) + \frac{1}{9} \cdot \left({\left(\frac{1}{{x}^{7}}\right)}^{\frac{1}{3}} \cdot \frac{1}{{\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}}\right)\right)}} \leadsto e^{\color{blue}{\left(\frac{1}{3} \cdot \left({\left(\frac{1}{{x}^{4}}\right)}^{\frac{1}{3}} \cdot \frac{1}{{\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}}\right) + \log \left({\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}\right)\right) - \left(\frac{1}{18} \cdot \left({\left(\frac{1}{{x}^{8}}\right)}^{\frac{1}{3}} \cdot \frac{1}{{\left({\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}\right)}^2}\right) + \frac{1}{9} \cdot \left({\left(\frac{1}{{x}^{7}}\right)}^{\frac{1}{3}} \cdot \frac{1}{{\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}}\right)\right)}}\]
      30.9
    8. Applied simplify to get
      \[e^{\left(\frac{1}{3} \cdot \left({\left(\frac{1}{{x}^{4}}\right)}^{\frac{1}{3}} \cdot \frac{1}{{\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}}\right) + \log \left({\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}\right)\right) - \left(\frac{1}{18} \cdot \left({\left(\frac{1}{{x}^{8}}\right)}^{\frac{1}{3}} \cdot \frac{1}{{\left({\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}\right)}^2}\right) + \frac{1}{9} \cdot \left({\left(\frac{1}{{x}^{7}}\right)}^{\frac{1}{3}} \cdot \frac{1}{{\left(\frac{1}{x}\right)}^{\frac{1}{3}} - {x}^{\frac{-1}{3}}}\right)\right)} \leadsto e^{\left(\log \left(\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}\right) + \frac{\sqrt[3]{\frac{1}{{x}^{4}}}}{\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}} \cdot \frac{1}{3}\right) - \left(\frac{\sqrt[3]{\frac{1}{{x}^{7}}}}{\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}} \cdot \frac{1}{9} + \frac{\frac{1}{18}}{\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}} \cdot \frac{\sqrt[3]{\frac{1}{{x}^{8}}}}{\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}}\right)}\]
      29.3

    9. Applied final simplification
    10. Applied simplify to get
      \[\color{red}{e^{\left(\log \left(\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}\right) + \frac{\sqrt[3]{\frac{1}{{x}^{4}}}}{\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}} \cdot \frac{1}{3}\right) - \left(\frac{\sqrt[3]{\frac{1}{{x}^{7}}}}{\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}} \cdot \frac{1}{9} + \frac{\frac{1}{18}}{\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}} \cdot \frac{\sqrt[3]{\frac{1}{{x}^{8}}}}{\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}}\right)}} \leadsto \color{blue}{e^{\left(\log \left(\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}\right) - \frac{\frac{1}{9}}{\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}} \cdot \sqrt[3]{\frac{1}{{x}^{7}}}\right) + \left(\frac{\frac{1}{3}}{\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}} \cdot \sqrt[3]{\frac{1}{{x}^{4}}} - \frac{\sqrt[3]{\frac{1}{{x}^{8}}} \cdot \frac{1}{18}}{{\left(\sqrt[3]{\frac{1}{x}} - {x}^{\frac{-1}{3}}\right)}^2}\right)}}\]
      29.3

  1. Removed slow pow expressions

Original test:


(lambda ((x default))
  #:name "NMSE problem 3.3.4"
  (- (pow (+ x 1) (/ 1 3)) (pow x (/ 1 3))))