Average Error: 0.3 → 0.0
Time: 8.8s
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 r3080287 = x;
        double r3080288 = log(r3080287);
        double r3080289 = log(r3080288);
        double r3080290 = r3080288 - r3080289;
        return r3080290;
}
↓
double f(double x) {
        double r3080291 = x;
        double r3080292 = log(r3080291);
        double r3080293 = r3080291 / r3080292;
        double r3080294 = log(r3080293);
        return r3080294;
}

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 2019162 
(FPCore (x)
  :name "Jmat.Real.lambertw, estimator"
  (- (log x) (log (log x))))