Average Error: 42.1 → 21.0
Time: 55.4s
Precision: 64
Internal Precision: 128
\[100 \cdot \frac{{\left(1 + \frac{i}{n}\right)}^{n} - 1}{\frac{i}{n}}\]
\[\begin{array}{l} \mathbf{if}\;n \le -3.0141441825975826 \cdot 10^{+60}:\\ \;\;\;\;\left(e^{\log \left(\frac{\left(\frac{1}{6} \cdot i + \frac{1}{2}\right) \cdot \left(i \cdot i\right) + i}{i}\right)} \cdot 100\right) \cdot n\\ \mathbf{elif}\;n \le -2.8191387785351184 \cdot 10^{+38}:\\ \;\;\;\;{\left(\frac{i}{n} + 1\right)}^{n} \cdot \frac{100 \cdot n}{i} - \frac{100 \cdot n}{i}\\ \mathbf{elif}\;n \le -0.49358309211804946 \lor \neg \left(n \le 1.0786542170041112 \cdot 10^{-192}\right):\\ \;\;\;\;\left(e^{\log \left(\frac{\left(\frac{1}{6} \cdot i + \frac{1}{2}\right) \cdot \left(i \cdot i\right) + i}{i}\right)} \cdot 100\right) \cdot n\\ \mathbf{else}:\\ \;\;\;\;0\\ \end{array}\]

Error

Bits error versus i

Bits error versus n

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Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original42.1
Target41.8
Herbie21.0
\[100 \cdot \frac{e^{n \cdot \begin{array}{l} \mathbf{if}\;1 + \frac{i}{n} = 1:\\ \;\;\;\;\frac{i}{n}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{i}{n} \cdot \log \left(1 + \frac{i}{n}\right)}{\left(\frac{i}{n} + 1\right) - 1}\\ \end{array}} - 1}{\frac{i}{n}}\]

Derivation

  1. Split input into 3 regimes
  2. if n < -3.0141441825975826e+60 or -2.8191387785351184e+38 < n < -0.49358309211804946 or 1.0786542170041112e-192 < n

    1. Initial program 52.3

      \[100 \cdot \frac{{\left(1 + \frac{i}{n}\right)}^{n} - 1}{\frac{i}{n}}\]
    2. Taylor expanded around 0 37.6

      \[\leadsto 100 \cdot \frac{\color{blue}{i + \left(\frac{1}{2} \cdot {i}^{2} + \frac{1}{6} \cdot {i}^{3}\right)}}{\frac{i}{n}}\]
    3. Simplified37.5

      \[\leadsto 100 \cdot \frac{\color{blue}{i + \left(i \cdot i\right) \cdot \left(\frac{1}{6} \cdot i + \frac{1}{2}\right)}}{\frac{i}{n}}\]
    4. Using strategy rm
    5. Applied associate-/r/22.6

      \[\leadsto 100 \cdot \color{blue}{\left(\frac{i + \left(i \cdot i\right) \cdot \left(\frac{1}{6} \cdot i + \frac{1}{2}\right)}{i} \cdot n\right)}\]
    6. Applied associate-*r*22.6

      \[\leadsto \color{blue}{\left(100 \cdot \frac{i + \left(i \cdot i\right) \cdot \left(\frac{1}{6} \cdot i + \frac{1}{2}\right)}{i}\right) \cdot n}\]
    7. Using strategy rm
    8. Applied add-exp-log22.6

      \[\leadsto \left(100 \cdot \color{blue}{e^{\log \left(\frac{i + \left(i \cdot i\right) \cdot \left(\frac{1}{6} \cdot i + \frac{1}{2}\right)}{i}\right)}}\right) \cdot n\]

    if -3.0141441825975826e+60 < n < -2.8191387785351184e+38

    1. Initial program 33.0

      \[100 \cdot \frac{{\left(1 + \frac{i}{n}\right)}^{n} - 1}{\frac{i}{n}}\]
    2. Initial simplification33.0

      \[\leadsto \frac{n \cdot 100}{i} \cdot {\left(1 + \frac{i}{n}\right)}^{n} - \frac{n \cdot 100}{i}\]

    if -0.49358309211804946 < n < 1.0786542170041112e-192

    1. Initial program 21.1

      \[100 \cdot \frac{{\left(1 + \frac{i}{n}\right)}^{n} - 1}{\frac{i}{n}}\]
    2. Taylor expanded around 0 16.5

      \[\leadsto \color{blue}{0}\]
  3. Recombined 3 regimes into one program.
  4. Final simplification21.0

    \[\leadsto \begin{array}{l} \mathbf{if}\;n \le -3.0141441825975826 \cdot 10^{+60}:\\ \;\;\;\;\left(e^{\log \left(\frac{\left(\frac{1}{6} \cdot i + \frac{1}{2}\right) \cdot \left(i \cdot i\right) + i}{i}\right)} \cdot 100\right) \cdot n\\ \mathbf{elif}\;n \le -2.8191387785351184 \cdot 10^{+38}:\\ \;\;\;\;{\left(\frac{i}{n} + 1\right)}^{n} \cdot \frac{100 \cdot n}{i} - \frac{100 \cdot n}{i}\\ \mathbf{elif}\;n \le -0.49358309211804946 \lor \neg \left(n \le 1.0786542170041112 \cdot 10^{-192}\right):\\ \;\;\;\;\left(e^{\log \left(\frac{\left(\frac{1}{6} \cdot i + \frac{1}{2}\right) \cdot \left(i \cdot i\right) + i}{i}\right)} \cdot 100\right) \cdot n\\ \mathbf{else}:\\ \;\;\;\;0\\ \end{array}\]

Runtime

Time bar (total: 55.4s)Debug logProfile

herbie shell --seed 2018348 
(FPCore (i n)
  :name "Compound Interest"

  :herbie-target
  (* 100 (/ (- (exp (* n (if (== (+ 1 (/ i n)) 1) (/ i n) (/ (* (/ i n) (log (+ 1 (/ i n)))) (- (+ (/ i n) 1) 1))))) 1) (/ i n)))

  (* 100 (/ (- (pow (+ 1 (/ i n)) n) 1) (/ i n))))