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@myon-bioinformatics(myon bioinformatics🐍🎸)

[Python]等差数列×等比数列の解を求めてみた[備忘録]

Last updated at Posted at 2021-08-01

はじめに

実装結果を備忘録として残します🐍
Python3環境下にて、是非お使いください🎸

本編

数式

今回コーディングする当差数列×等比数列の数式： \left(an+b \right) \left(c \right)^{\!n}

コーディング

python
#sympy内の関数を使用
from sympy import *
n=Symbol("n")
a,b,c = map(int,input("a,b,c=? ? ?").split())
while c==0:
    print("Input a,b,c except c=0")
    a,b,c = map(int,input("a,b,c=? ? ?").split())
Prog = sequence((a*n+b)*c**n, (n, 0, 20))

#以下、出力(例：a,b,c=1 1 2)
print([int(N) for N in Prog])
print(Prog[3])

出力結果
[1, 4, 12, 32, 80, 192, 448, 1024, 2304, 5120, 11264, 24576, 53248, 114688, 245760, 524288, 1114112, 2359296, 4980736, 10485760, 22020096]
32

使い方

▶a,b,cは半角スペースで区切り、入力してください。

c=0の場合、while文以下のループが発生します。(c≠0でお願いいたします。)

▶外部ライブラリにつき、予めインストールを要します。（以下、プロンプトでの入力例）

bash/zsh
conda install sympy　#エラーが起これば、下のコマンドを実行してください。
pip install sympy

References

More Info

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