Average Error: 2.0 → 0.2
Time: 4.7s
Precision: binary64
\[x - \frac{y - z}{\frac{\left(t - z\right) + 1}{a}}\]
↓
\[x + a \cdot \frac{z - y}{t + \left(1 - z\right)}\]
x - \frac{y - z}{\frac{\left(t - z\right) + 1}{a}}
↓
x + a \cdot \frac{z - y}{t + \left(1 - z\right)}
(FPCore (x y z t a)
 :precision binary64
 (- x (/ (- y z) (/ (+ (- t z) 1.0) a))))
↓
(FPCore (x y z t a)
 :precision binary64
 (+ x (* a (/ (- z y) (+ t (- 1.0 z))))))
double code(double x, double y, double z, double t, double a) {
	return ((double) (x - (((double) (y - z)) / (((double) (((double) (t - z)) + 1.0)) / a))));
}
↓
double code(double x, double y, double z, double t, double a) {
	return ((double) (x + ((double) (a * (((double) (z - y)) / ((double) (t + ((double) (1.0 - z)))))))));
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Bits error versus t

Bits error versus a

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original2.0
Target0.2
Herbie0.2
\[x - \frac{y - z}{\left(t - z\right) + 1} \cdot a\]

Derivation

  1. Initial program Error: 2.0 bits

    \[x - \frac{y - z}{\frac{\left(t - z\right) + 1}{a}}\]

  2. SimplifiedError: 0.2 bits

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

  3. Final simplificationError: 0.2 bits

    \[\leadsto x + a \cdot \frac{z - y}{t + \left(1 - z\right)}\]

Reproduce

herbie shell --seed 2020204 
(FPCore (x y z t a)
  :name "Graphics.Rendering.Chart.SparkLine:renderSparkLine from Chart-1.5.3"
  :precision binary64

  :herbie-target
  (- x (* (/ (- y z) (+ (- t z) 1.0)) a))

  (- x (/ (- y z) (/ (+ (- t z) 1.0) a))))