Average Error: 0.0 → 0.0
Time: 1.2s
Precision: 64
\[-\log \left(\frac{1}{x} - 1\right)\]
↓
\[-\log \left(\frac{1}{x} - 1\right)\]
-\log \left(\frac{1}{x} - 1\right)
↓
-\log \left(\frac{1}{x} - 1\right)
double f(double x) {
        double r1918 = 1.0;
        double r1919 = x;
        double r1920 = r1918 / r1919;
        double r1921 = r1920 - r1918;
        double r1922 = log(r1921);
        double r1923 = -r1922;
        return r1923;
}
↓
double f(double x) {
        double r1924 = 1.0;
        double r1925 = x;
        double r1926 = r1924 / r1925;
        double r1927 = r1926 - r1924;
        double r1928 = log(r1927);
        double r1929 = -r1928;
        return r1929;
}

Error

Bits error versus x

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 0.0

    \[-\log \left(\frac{1}{x} - 1\right)\]

  2. Final simplification0.0

    \[\leadsto -\log \left(\frac{1}{x} - 1\right)\]

Reproduce

herbie shell --seed 2019352 
(FPCore (x)
  :name "neg log"
  :precision binary64
  (- (log (- (/ 1 x) 1))))