\[\frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot e^{-\left(1 - \varepsilon\right) \cdot x} - \left(\frac{1}{\varepsilon} - 1\right) \cdot e^{-\left(1 + \varepsilon\right) \cdot x}}{2}\]
Test:
NMSE Section 6.1 mentioned, A
Bits:
128 bits
Bits error versus x
Bits error versus eps
Time: 26.9 s
Input Error: 18.8
Output Error: 5.4
Log:
Profile: 🕒
\(\frac{\frac{{x}^2 \cdot 3 + \left(2 + x \cdot 4\right)}{2}}{{\left(e^{x}\right)}^{\left(1 - \left(-1\right)\right)}}\)
  1. Started with
    \[\frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot e^{-\left(1 - \varepsilon\right) \cdot x} - \left(\frac{1}{\varepsilon} - 1\right) \cdot e^{-\left(1 + \varepsilon\right) \cdot x}}{2}\]
    18.8
  2. Using strategy rm
    18.8
  3. Applied exp-neg to get
    \[\frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot e^{-\left(1 - \varepsilon\right) \cdot x} - \left(\frac{1}{\varepsilon} - 1\right) \cdot \color{red}{e^{-\left(1 + \varepsilon\right) \cdot x}}}{2} \leadsto \frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot e^{-\left(1 - \varepsilon\right) \cdot x} - \left(\frac{1}{\varepsilon} - 1\right) \cdot \color{blue}{\frac{1}{e^{\left(1 + \varepsilon\right) \cdot x}}}}{2}\]
    18.8
  4. Applied un-div-inv to get
    \[\frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot e^{-\left(1 - \varepsilon\right) \cdot x} - \color{red}{\left(\frac{1}{\varepsilon} - 1\right) \cdot \frac{1}{e^{\left(1 + \varepsilon\right) \cdot x}}}}{2} \leadsto \frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot e^{-\left(1 - \varepsilon\right) \cdot x} - \color{blue}{\frac{\frac{1}{\varepsilon} - 1}{e^{\left(1 + \varepsilon\right) \cdot x}}}}{2}\]
    18.8
  5. Applied exp-neg to get
    \[\frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot \color{red}{e^{-\left(1 - \varepsilon\right) \cdot x}} - \frac{\frac{1}{\varepsilon} - 1}{e^{\left(1 + \varepsilon\right) \cdot x}}}{2} \leadsto \frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot \color{blue}{\frac{1}{e^{\left(1 - \varepsilon\right) \cdot x}}} - \frac{\frac{1}{\varepsilon} - 1}{e^{\left(1 + \varepsilon\right) \cdot x}}}{2}\]
    18.7
  6. Applied un-div-inv to get
    \[\frac{\color{red}{\left(1 + \frac{1}{\varepsilon}\right) \cdot \frac{1}{e^{\left(1 - \varepsilon\right) \cdot x}}} - \frac{\frac{1}{\varepsilon} - 1}{e^{\left(1 + \varepsilon\right) \cdot x}}}{2} \leadsto \frac{\color{blue}{\frac{1 + \frac{1}{\varepsilon}}{e^{\left(1 - \varepsilon\right) \cdot x}}} - \frac{\frac{1}{\varepsilon} - 1}{e^{\left(1 + \varepsilon\right) \cdot x}}}{2}\]
    18.8
  7. Applied frac-sub to get
    \[\frac{\color{red}{\frac{1 + \frac{1}{\varepsilon}}{e^{\left(1 - \varepsilon\right) \cdot x}} - \frac{\frac{1}{\varepsilon} - 1}{e^{\left(1 + \varepsilon\right) \cdot x}}}}{2} \leadsto \frac{\color{blue}{\frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot e^{\left(1 + \varepsilon\right) \cdot x} - e^{\left(1 - \varepsilon\right) \cdot x} \cdot \left(\frac{1}{\varepsilon} - 1\right)}{e^{\left(1 - \varepsilon\right) \cdot x} \cdot e^{\left(1 + \varepsilon\right) \cdot x}}}}{2}\]
    23.7
  8. Applied simplify to get
    \[\frac{\frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot e^{\left(1 + \varepsilon\right) \cdot x} - e^{\left(1 - \varepsilon\right) \cdot x} \cdot \left(\frac{1}{\varepsilon} - 1\right)}{\color{red}{e^{\left(1 - \varepsilon\right) \cdot x} \cdot e^{\left(1 + \varepsilon\right) \cdot x}}}}{2} \leadsto \frac{\frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot e^{\left(1 + \varepsilon\right) \cdot x} - e^{\left(1 - \varepsilon\right) \cdot x} \cdot \left(\frac{1}{\varepsilon} - 1\right)}{\color{blue}{{\left(e^{x}\right)}^{\left(1 - \left(-1\right)\right)}}}}{2}\]
    23.7
  9. Applied taylor to get
    \[\frac{\frac{\left(1 + \frac{1}{\varepsilon}\right) \cdot e^{\left(1 + \varepsilon\right) \cdot x} - e^{\left(1 - \varepsilon\right) \cdot x} \cdot \left(\frac{1}{\varepsilon} - 1\right)}{{\left(e^{x}\right)}^{\left(1 - \left(-1\right)\right)}}}{2} \leadsto \frac{\frac{3 \cdot {x}^2 + \left(2 + 4 \cdot x\right)}{{\left(e^{x}\right)}^{\left(1 - \left(-1\right)\right)}}}{2}\]
    5.4
  10. Taylor expanded around 0 to get
    \[\frac{\frac{\color{red}{3 \cdot {x}^2 + \left(2 + 4 \cdot x\right)}}{{\left(e^{x}\right)}^{\left(1 - \left(-1\right)\right)}}}{2} \leadsto \frac{\frac{\color{blue}{3 \cdot {x}^2 + \left(2 + 4 \cdot x\right)}}{{\left(e^{x}\right)}^{\left(1 - \left(-1\right)\right)}}}{2}\]
    5.4
  11. Applied simplify to get
    \[\frac{\frac{3 \cdot {x}^2 + \left(2 + 4 \cdot x\right)}{{\left(e^{x}\right)}^{\left(1 - \left(-1\right)\right)}}}{2} \leadsto \frac{\left(x \cdot x\right) \cdot 3 + \left(2 + 4 \cdot x\right)}{2 \cdot {\left(e^{x}\right)}^{\left(1 - \left(-1\right)\right)}}\]
    5.4

  12. Applied final simplification
  13. Applied simplify to get
    \[\color{red}{\frac{\left(x \cdot x\right) \cdot 3 + \left(2 + 4 \cdot x\right)}{2 \cdot {\left(e^{x}\right)}^{\left(1 - \left(-1\right)\right)}}} \leadsto \color{blue}{\frac{\frac{{x}^2 \cdot 3 + \left(2 + x \cdot 4\right)}{2}}{{\left(e^{x}\right)}^{\left(1 - \left(-1\right)\right)}}}\]
    5.4

Original test:


(lambda ((x default) (eps default))
  #:name "NMSE Section 6.1 mentioned, A"
  (/ (- (* (+ 1 (/ 1 eps)) (exp (- (* (- 1 eps) x)))) (* (- (/ 1 eps) 1) (exp (- (* (+ 1 eps) x))))) 2))