Average Error: 2.0 → 2.0
Time: 5.5s
Precision: 64
\[\frac{x - y}{z - y} \cdot t\]
↓
\[\frac{t}{\frac{z - y}{x - y}}\]
\frac{x - y}{z - y} \cdot t
↓
\frac{t}{\frac{z - y}{x - y}}
double f(double x, double y, double z, double t) {
        double r660996 = x;
        double r660997 = y;
        double r660998 = r660996 - r660997;
        double r660999 = z;
        double r661000 = r660999 - r660997;
        double r661001 = r660998 / r661000;
        double r661002 = t;
        double r661003 = r661001 * r661002;
        return r661003;
}
↓
double f(double x, double y, double z, double t) {
        double r661004 = t;
        double r661005 = z;
        double r661006 = y;
        double r661007 = r661005 - r661006;
        double r661008 = x;
        double r661009 = r661008 - r661006;
        double r661010 = r661007 / r661009;
        double r661011 = r661004 / r661010;
        return r661011;
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Bits error versus t

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original2.0
Target2.0
Herbie2.0
\[\frac{t}{\frac{z - y}{x - y}}\]

Derivation

  1. Initial program 2.0

    \[\frac{x - y}{z - y} \cdot t\]
  2. Using strategy rm

  3. Applied clear-num2.2

    \[\leadsto \color{blue}{\frac{1}{\frac{z - y}{x - y}}} \cdot t\]
  4. Using strategy rm

  5. Applied pow12.2

    \[\leadsto \frac{1}{\frac{z - y}{x - y}} \cdot \color{blue}{{t}^{1}}\]

  6. Applied pow12.2

    \[\leadsto \color{blue}{{\left(\frac{1}{\frac{z - y}{x - y}}\right)}^{1}} \cdot {t}^{1}\]

  7. Applied pow-prod-down2.2

    \[\leadsto \color{blue}{{\left(\frac{1}{\frac{z - y}{x - y}} \cdot t\right)}^{1}}\]

  8. Simplified2.0

    \[\leadsto {\color{blue}{\left(\frac{t}{\frac{z - y}{x - y}}\right)}}^{1}\]

  9. Final simplification2.0

    \[\leadsto \frac{t}{\frac{z - y}{x - y}}\]

Reproduce

herbie shell --seed 2020025 +o rules:numerics
(FPCore (x y z t)
  :name "Numeric.Signal.Multichannel:$cput from hsignal-0.2.7.1"
  :precision binary64

  :herbie-target
  (/ t (/ (- z y) (- x y)))

  (* (/ (- x y) (- z y)) t))