lcsrodriguez / fibonacci

Fibonacci presentation

Academic presentation (in French) on the numeric computation of the Fibonacci sequence $(F_n)_{n \in \mathbb{N}}$ defined as follows : $F_0 = 0$, $F_1 = 1$ and :

$$\forall n \geq 2, \ F_{n+2} = F_{n+1} + F_n$$

Main issue : How to compute Fibonacci sequence in the most powerful way ?

Execution of sample/plotting script :

pip install matplotlib # unique Python dependency
python3 script.py

Table of contents

• Naive and iterative approaches
  • Recursion formula
  • Explicit method
• Recursion, a good lead ?
  • Implementation attempt
  • Comparison of iterative and recursive methods
• A last track : matrix writing
  • General presentation of the used method
  • Choice of fast exponentiation method
  • Implementation for calculating quantities $F_n$
• Conclusion & Answer to the problem
• Appendix : Application of $F_n$ • Euclid's algorithm

Main reference : Based on Arnaud de Saint Julien's paper : Escapade algorithmique avec Fibonacci

Author

Lucas RODRIGUEZ (MPSI - 2018/2019)