Average Error: 0.2 → 0.0
Time: 7.6s
Precision: 64
\[\log x - \log \left(\log x\right)\]
↓
\[\log \left(\frac{x}{\log x}\right)\]
\log x - \log \left(\log x\right)
↓
\log \left(\frac{x}{\log x}\right)
double f(double x) {
        double r3114619 = x;
        double r3114620 = log(r3114619);
        double r3114621 = log(r3114620);
        double r3114622 = r3114620 - r3114621;
        return r3114622;
}
↓
double f(double x) {
        double r3114623 = x;
        double r3114624 = log(r3114623);
        double r3114625 = r3114623 / r3114624;
        double r3114626 = log(r3114625);
        return r3114626;
}

Error

Bits error versus x

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 0.2

    \[\log x - \log \left(\log x\right)\]
  2. Using strategy rm

  3. Applied diff-log0.0

    \[\leadsto \color{blue}{\log \left(\frac{x}{\log x}\right)}\]

  4. Final simplification0.0

    \[\leadsto \log \left(\frac{x}{\log x}\right)\]

Reproduce

herbie shell --seed 2019171 
(FPCore (x)
  :name "Jmat.Real.lambertw, estimator"
  (- (log x) (log (log x))))