Solve Command for Unknown Parameters
3 ビュー (過去 30 日間)
古いコメントを表示
Dears,
How can I solve the following equation with MATLAB to get the value of the unknown parameter (beta):
7*exp(-0.008*beta)+0.008*sin(7*beta)-7*cos(7*beta)=0
I tried to use "SOLVE" command, but it give me every time: beta = 0
I don't know what's the incorrect in it.
0 件のコメント
採用された回答
Steven Lord
2018 年 8 月 23 日
Let's see how your function looks in a neighborhood around y = 0.
f = @(beta) 7*exp(-0.008*beta)+0.008*sin(7*beta)-7*cos(7*beta);
fplot(f);
yticks(0);
grid on
ylim([-0.5 0.5]);
beta = 0 does look like a solution, but it is not the only solution. Calling fzero with different initial guesses may allow you to calculate those other solutions. If you think about your function you should be able to calculate roughly how far apart the local minima of your function should be, and that can inform your choice of starting points for fzero.
その他の回答 (1 件)
参考
カテゴリ
Help Center および File Exchange で Calculus についてさらに検索
製品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!