\[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
Test:
NMSE problem 3.3.4
Bits:
128 bits
Bits error versus x
Time: 23.3 s
Input Error: 9.7
Output Error: 12.9
Log:
Profile: 🕒
\(\begin{cases} e^{\log \left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\right)} & \text{when } x \le 12708545.0f0 \\ \left(\sqrt[3]{\frac{1}{x}} + \frac{1}{3} \cdot \sqrt[3]{\frac{1}{{x}^{4}}}\right) - \left({x}^{\left(\log e \cdot \frac{-1}{3}\right)} + \frac{1}{9} \cdot \sqrt[3]{\frac{1}{{x}^{7}}}\right) & \text{otherwise} \end{cases}\)

    if x < 12708545.0f0

    1. Started with
      \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
      2.0
    2. Using strategy rm
      2.0
    3. Applied add-exp-log to get
      \[\color{red}{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}} \leadsto \color{blue}{e^{\log \left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\right)}}\]
      2.0

    if 12708545.0f0 < x

    1. Started with
      \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
      20.7
    2. Using strategy rm
      20.7
    3. Applied pow-to-exp to get
      \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - \color{red}{{x}^{\left(\frac{1}{3}\right)}} \leadsto {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - \color{blue}{e^{\log x \cdot \frac{1}{3}}}\]
      29.5
    4. Applied simplify to get
      \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - e^{\color{red}{\log x \cdot \frac{1}{3}}} \leadsto {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - e^{\color{blue}{\frac{\log x}{3}}}\]
      29.4
    5. Using strategy rm
      29.4
    6. Applied *-un-lft-identity to get
      \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - e^{\color{red}{\frac{\log x}{3}}} \leadsto {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - e^{\color{blue}{1 \cdot \frac{\log x}{3}}}\]
      29.4
    7. Applied exp-prod to get
      \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - \color{red}{e^{1 \cdot \frac{\log x}{3}}} \leadsto {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - \color{blue}{{\left(e^{1}\right)}^{\left(\frac{\log x}{3}\right)}}\]
      29.4
    8. Applied simplify to get
      \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {\color{red}{\left(e^{1}\right)}}^{\left(\frac{\log x}{3}\right)} \leadsto {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {\color{blue}{e}}^{\left(\frac{\log x}{3}\right)}\]
      29.4
    9. Using strategy rm
      29.4
    10. Applied add-sqr-sqrt to get
      \[\color{red}{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} - {e}^{\left(\frac{\log x}{3}\right)} \leadsto \color{blue}{{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^2} - {e}^{\left(\frac{\log x}{3}\right)}\]
      29.5
    11. Applied taylor to get
      \[{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^2 - {e}^{\left(\frac{\log x}{3}\right)} \leadsto \left(\frac{1}{3} \cdot {\left(\frac{1}{{x}^{4}}\right)}^{\frac{1}{3}} + {\left(\frac{1}{x}\right)}^{\frac{1}{3}}\right) - \left(\frac{1}{9} \cdot {\left(\frac{1}{{x}^{7}}\right)}^{\frac{1}{3}} + e^{\frac{-1}{3} \cdot \left(\log e \cdot \log x\right)}\right)\]
      28.5
    12. Taylor expanded around inf to get
      \[\color{red}{\left(\frac{1}{3} \cdot {\left(\frac{1}{{x}^{4}}\right)}^{\frac{1}{3}} + {\left(\frac{1}{x}\right)}^{\frac{1}{3}}\right) - \left(\frac{1}{9} \cdot {\left(\frac{1}{{x}^{7}}\right)}^{\frac{1}{3}} + e^{\frac{-1}{3} \cdot \left(\log e \cdot \log x\right)}\right)} \leadsto \color{blue}{\left(\frac{1}{3} \cdot {\left(\frac{1}{{x}^{4}}\right)}^{\frac{1}{3}} + {\left(\frac{1}{x}\right)}^{\frac{1}{3}}\right) - \left(\frac{1}{9} \cdot {\left(\frac{1}{{x}^{7}}\right)}^{\frac{1}{3}} + e^{\frac{-1}{3} \cdot \left(\log e \cdot \log x\right)}\right)}\]
      28.5
    13. Applied simplify to get
      \[\left(\frac{1}{3} \cdot {\left(\frac{1}{{x}^{4}}\right)}^{\frac{1}{3}} + {\left(\frac{1}{x}\right)}^{\frac{1}{3}}\right) - \left(\frac{1}{9} \cdot {\left(\frac{1}{{x}^{7}}\right)}^{\frac{1}{3}} + e^{\frac{-1}{3} \cdot \left(\log e \cdot \log x\right)}\right) \leadsto \left(\sqrt[3]{\frac{1}{x}} + \frac{1}{3} \cdot \sqrt[3]{\frac{1}{{x}^{4}}}\right) - \left({x}^{\left(\log e \cdot \frac{-1}{3}\right)} + \frac{1}{9} \cdot \sqrt[3]{\frac{1}{{x}^{7}}}\right)\]
      28.3

    14. Applied final simplification

  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))))