problem using the solve method

2 ビュー (過去 30 日間)
Ej
Ej 2022 年 10 月 3 日
回答済み: Torsten 2022 年 10 月 3 日
i am trying to solve for t when the following equation: 1000/(exp(log(4) - t/40) + 1) is equal to 800, but matlab wont give me an exact solution. This is my code and what the outcome is:
>> syms t
>> eqn = 1000/(exp(log(4) - t/40) + 1) == 800;
>> solve(eqn, t)
ans =
80*log(2) + 31216573840826795/562949953421312
How do iget it to give me the exact solution (which should be around 110.9)

採用された回答

Torsten
Torsten 2022 年 10 月 3 日
syms t
eqn = 1000/(exp(log(4) - t/40) + 1) == 800;
tsol = vpa(solve(eqn, t))
tsol = 
110.90354888959124765151968835627

その他の回答 (0 件)

カテゴリ

Help Center および File ExchangeSymbolic Math Toolbox についてさらに検索

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by