\[\left(\left(N + 1\right) \cdot \log \left(N + 1\right) - N \cdot \log N\right) - 1\]
Test:
NMSE example 3.8
Bits:
128 bits
Bits error versus N
Time: 44.4 s
Input Error: 31.0
Output Error: 29.9
Log:
Profile: 🕒
\(\left(\left(\left({N}^2 - 1\right) \cdot \log \left(N + 1\right)\right) \cdot \frac{1}{N - 1} - {\left(\sqrt[3]{N \cdot \log N}\right)}^3\right) - 1\)
  1. Started with
    \[\left(\left(N + 1\right) \cdot \log \left(N + 1\right) - N \cdot \log N\right) - 1\]
    31.0
  2. Using strategy rm
    31.0
  3. Applied flip-+ to get
    \[\left(\color{red}{\left(N + 1\right)} \cdot \log \left(N + 1\right) - N \cdot \log N\right) - 1 \leadsto \left(\color{blue}{\frac{{N}^2 - {1}^2}{N - 1}} \cdot \log \left(N + 1\right) - N \cdot \log N\right) - 1\]
    30.1
  4. Applied associate-*l/ to get
    \[\left(\color{red}{\frac{{N}^2 - {1}^2}{N - 1} \cdot \log \left(N + 1\right)} - N \cdot \log N\right) - 1 \leadsto \left(\color{blue}{\frac{\left({N}^2 - {1}^2\right) \cdot \log \left(N + 1\right)}{N - 1}} - N \cdot \log N\right) - 1\]
    29.9
  5. Applied simplify to get
    \[\left(\frac{\color{red}{\left({N}^2 - {1}^2\right) \cdot \log \left(N + 1\right)}}{N - 1} - N \cdot \log N\right) - 1 \leadsto \left(\frac{\color{blue}{\left({N}^2 - 1\right) \cdot \log \left(N + 1\right)}}{N - 1} - N \cdot \log N\right) - 1\]
    29.9
  6. Using strategy rm
    29.9
  7. Applied add-cube-cbrt to get
    \[\left(\frac{\left({N}^2 - 1\right) \cdot \log \left(N + 1\right)}{N - 1} - \color{red}{N \cdot \log N}\right) - 1 \leadsto \left(\frac{\left({N}^2 - 1\right) \cdot \log \left(N + 1\right)}{N - 1} - \color{blue}{{\left(\sqrt[3]{N \cdot \log N}\right)}^3}\right) - 1\]
    29.9
  8. Using strategy rm
    29.9
  9. Applied div-inv to get
    \[\left(\color{red}{\frac{\left({N}^2 - 1\right) \cdot \log \left(N + 1\right)}{N - 1}} - {\left(\sqrt[3]{N \cdot \log N}\right)}^3\right) - 1 \leadsto \left(\color{blue}{\left(\left({N}^2 - 1\right) \cdot \log \left(N + 1\right)\right) \cdot \frac{1}{N - 1}} - {\left(\sqrt[3]{N \cdot \log N}\right)}^3\right) - 1\]
    29.9

  10. Removed slow pow expressions

Original test:


(lambda ((N default))
  #:name "NMSE example 3.8"
  (- (- (* (+ N 1) (log (+ N 1))) (* N (log N))) 1)
  #:target
  (- (log (+ N 1)) (- (/ 1 (* 2 N)) (- (/ 1 (* 3 (sqr N))) (/ 4 (pow N 3))))))