Average Error: 42.2 → 15.9
Time: 39.2s
Precision: 64
Internal Precision: 128
\[100 \cdot \frac{{\left(1 + \frac{i}{n}\right)}^{n} - 1}{\frac{i}{n}}\]
\[\begin{array}{l} \mathbf{if}\;i \le -0.00020526279674285735:\\ \;\;\;\;\frac{100 \cdot e^{i} - 100}{\frac{i}{n}}\\ \mathbf{elif}\;i \le 4.1504571246210365 \cdot 10^{-07}:\\ \;\;\;\;\frac{\left(i \cdot \left(\left(100 + 50 \cdot i\right) + i \cdot \left(\frac{50}{3} \cdot i\right)\right)\right) \cdot n}{i}\\ \mathbf{else}:\\ \;\;\;\;\left(\left(\frac{50}{3} \cdot \frac{\left({\left(\log n\right)}^{2} \cdot \log i\right) \cdot {n}^{4}}{i} + \left(\left(\left(\frac{{n}^{3} \cdot {\left(\log i\right)}^{2}}{i} \cdot 50 + \frac{{\left(\log n\right)}^{2} \cdot {n}^{3}}{i} \cdot 50\right) + 100 \cdot \frac{\log i \cdot {n}^{2}}{i}\right) + \frac{50}{3} \cdot \frac{{\left(\log i\right)}^{3} \cdot {n}^{4}}{i}\right)\right) + \frac{100}{3} \cdot \frac{\left({\left(\log n\right)}^{2} \cdot \log i\right) \cdot {n}^{4}}{i}\right) - \left(\frac{{n}^{4} \cdot {\left(\log n\right)}^{3}}{i} \cdot \frac{50}{3} + \left(\frac{\left(\log n \cdot {\left(\log i\right)}^{2}\right) \cdot {n}^{4}}{i} \cdot \frac{50}{3} + \left(50 \cdot \frac{\left(\log i \cdot \log n\right) \cdot {n}^{3}}{i} + \left(\left(\frac{\log n \cdot {n}^{2}}{i} \cdot 100 + 50 \cdot \frac{\left(\log i \cdot \log n\right) \cdot {n}^{3}}{i}\right) + \frac{100}{3} \cdot \frac{\left(\log n \cdot {\left(\log i\right)}^{2}\right) \cdot {n}^{4}}{i}\right)\right)\right)\right)\\ \end{array}\]

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

Original42.2
Target42.1
Herbie15.9
\[100 \cdot \frac{e^{n \cdot \begin{array}{l} \mathbf{if}\;1 + \frac{i}{n} = 1:\\ \;\;\;\;\frac{i}{n}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{i}{n} \cdot \log \left(1 + \frac{i}{n}\right)}{\left(\frac{i}{n} + 1\right) - 1}\\ \end{array}} - 1}{\frac{i}{n}}\]

Derivation

  1. Split input into 3 regimes
  2. if i < -0.00020526279674285735

    1. Initial program 27.4

      \[100 \cdot \frac{{\left(1 + \frac{i}{n}\right)}^{n} - 1}{\frac{i}{n}}\]
    2. Initial simplification27.9

      \[\leadsto \frac{n \cdot 100}{i} \cdot {\left(1 + \frac{i}{n}\right)}^{n} - \frac{n \cdot 100}{i}\]
    3. Taylor expanded around inf 12.7

      \[\leadsto \color{blue}{\frac{\left(100 \cdot e^{i} - 100\right) \cdot n}{i}}\]
    4. Using strategy rm
    5. Applied associate-/l*11.7

      \[\leadsto \color{blue}{\frac{100 \cdot e^{i} - 100}{\frac{i}{n}}}\]

    if -0.00020526279674285735 < i < 4.1504571246210365e-07

    1. Initial program 49.8

      \[100 \cdot \frac{{\left(1 + \frac{i}{n}\right)}^{n} - 1}{\frac{i}{n}}\]
    2. Initial simplification49.8

      \[\leadsto \frac{n \cdot 100}{i} \cdot {\left(1 + \frac{i}{n}\right)}^{n} - \frac{n \cdot 100}{i}\]
    3. Taylor expanded around inf 49.7

      \[\leadsto \color{blue}{\frac{\left(100 \cdot e^{i} - 100\right) \cdot n}{i}}\]
    4. Taylor expanded around 0 16.2

      \[\leadsto \frac{\color{blue}{\left(100 \cdot i + \left(50 \cdot {i}^{2} + \frac{50}{3} \cdot {i}^{3}\right)\right)} \cdot n}{i}\]
    5. Simplified16.2

      \[\leadsto \frac{\color{blue}{\left(\left(\left(100 + 50 \cdot i\right) + \left(i \cdot \frac{50}{3}\right) \cdot i\right) \cdot i\right)} \cdot n}{i}\]

    if 4.1504571246210365e-07 < i

    1. Initial program 32.1

      \[100 \cdot \frac{{\left(1 + \frac{i}{n}\right)}^{n} - 1}{\frac{i}{n}}\]
    2. Initial simplification32.0

      \[\leadsto \frac{n \cdot 100}{i} \cdot {\left(1 + \frac{i}{n}\right)}^{n} - \frac{n \cdot 100}{i}\]
    3. Taylor expanded around 0 21.5

      \[\leadsto \color{blue}{\left(\frac{100}{3} \cdot \frac{{n}^{4} \cdot \left({\left(\log n\right)}^{2} \cdot \log i\right)}{i} + \left(\frac{50}{3} \cdot \frac{{n}^{4} \cdot \left(\log i \cdot {\left(\log n\right)}^{2}\right)}{i} + \left(\frac{50}{3} \cdot \frac{{n}^{4} \cdot {\left(\log i\right)}^{3}}{i} + \left(100 \cdot \frac{{n}^{2} \cdot \log i}{i} + \left(50 \cdot \frac{{n}^{3} \cdot {\left(\log i\right)}^{2}}{i} + 50 \cdot \frac{{n}^{3} \cdot {\left(\log n\right)}^{2}}{i}\right)\right)\right)\right)\right) - \left(\frac{50}{3} \cdot \frac{{n}^{4} \cdot {\left(\log n\right)}^{3}}{i} + \left(\frac{50}{3} \cdot \frac{{n}^{4} \cdot \left(\log n \cdot {\left(\log i\right)}^{2}\right)}{i} + \left(50 \cdot \frac{{n}^{3} \cdot \left(\log n \cdot \log i\right)}{i} + \left(\frac{100}{3} \cdot \frac{{n}^{4} \cdot \left({\left(\log i\right)}^{2} \cdot \log n\right)}{i} + \left(100 \cdot \frac{{n}^{2} \cdot \log n}{i} + 50 \cdot \frac{{n}^{3} \cdot \left(\log i \cdot \log n\right)}{i}\right)\right)\right)\right)\right)}\]
  3. Recombined 3 regimes into one program.
  4. Final simplification15.9

    \[\leadsto \begin{array}{l} \mathbf{if}\;i \le -0.00020526279674285735:\\ \;\;\;\;\frac{100 \cdot e^{i} - 100}{\frac{i}{n}}\\ \mathbf{elif}\;i \le 4.1504571246210365 \cdot 10^{-07}:\\ \;\;\;\;\frac{\left(i \cdot \left(\left(100 + 50 \cdot i\right) + i \cdot \left(\frac{50}{3} \cdot i\right)\right)\right) \cdot n}{i}\\ \mathbf{else}:\\ \;\;\;\;\left(\left(\frac{50}{3} \cdot \frac{\left({\left(\log n\right)}^{2} \cdot \log i\right) \cdot {n}^{4}}{i} + \left(\left(\left(\frac{{n}^{3} \cdot {\left(\log i\right)}^{2}}{i} \cdot 50 + \frac{{\left(\log n\right)}^{2} \cdot {n}^{3}}{i} \cdot 50\right) + 100 \cdot \frac{\log i \cdot {n}^{2}}{i}\right) + \frac{50}{3} \cdot \frac{{\left(\log i\right)}^{3} \cdot {n}^{4}}{i}\right)\right) + \frac{100}{3} \cdot \frac{\left({\left(\log n\right)}^{2} \cdot \log i\right) \cdot {n}^{4}}{i}\right) - \left(\frac{{n}^{4} \cdot {\left(\log n\right)}^{3}}{i} \cdot \frac{50}{3} + \left(\frac{\left(\log n \cdot {\left(\log i\right)}^{2}\right) \cdot {n}^{4}}{i} \cdot \frac{50}{3} + \left(50 \cdot \frac{\left(\log i \cdot \log n\right) \cdot {n}^{3}}{i} + \left(\left(\frac{\log n \cdot {n}^{2}}{i} \cdot 100 + 50 \cdot \frac{\left(\log i \cdot \log n\right) \cdot {n}^{3}}{i}\right) + \frac{100}{3} \cdot \frac{\left(\log n \cdot {\left(\log i\right)}^{2}\right) \cdot {n}^{4}}{i}\right)\right)\right)\right)\\ \end{array}\]

Runtime

Time bar (total: 39.2s)Debug logProfile

herbie shell --seed 2018346 
(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))))