Average Error: 0.3 → 0.0
Time: 9.7s
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 r3608007 = x;
        double r3608008 = log(r3608007);
        double r3608009 = log(r3608008);
        double r3608010 = r3608008 - r3608009;
        return r3608010;
}
↓
double f(double x) {
        double r3608011 = x;
        double r3608012 = log(r3608011);
        double r3608013 = r3608011 / r3608012;
        double r3608014 = log(r3608013);
        return r3608014;
}

Error

Bits error versus x

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 0.3

    \[\log x - \log \left(\log x\right)\]
  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 2019132 +o rules:numerics
(FPCore (x)
  :name "Jmat.Real.lambertw, estimator"
  (- (log x) (log (log x))))