i am trying to solve ODE with the help of laplace transform, but it shows error in doing so, why?

1 次查看（过去 30 天）

显示更早的评论

Nilesh Vishwakarma 2021-7-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/883774-i-am-trying-to-solve-ode-with-the-help-of-laplace-transform-but-it-shows-error-in-doing-so-why

回答： Swetha Polemoni 2021-7-28

采纳的回答： Swetha Polemoni

syms x t s X

>> Dx = diff(x,t);

D2x = diff(Dx,t);

>> F=laplace(D2x+7*Dx+10*x(t)==20);

Error using sym/subsindex (line 864)

Invalid indexing or function definition. Indexing must follow MATLAB indexing. Function arguments must be symbolic variables,

and function body must be sym expression.

Error in sym/subsref (line 909)

R_tilde = builtin('subsref',L_tilde,Idx);

>>

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Swetha Polemoni 2021-7-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/883774-i-am-trying-to-solve-ode-with-the-help-of-laplace-transform-but-it-shows-error-in-doing-so-why#answer_755339

在 MATLAB Online 中打开

Hi

The error is due to usage of x(t) before decalaring it . Try the following line of code.

syms x(t)

Hope this helps

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

更多回答（0 个）

请先登录，再回答此问题。

类别

Mathematics and Optimization Symbolic Math Toolbox

在 Help Center 和 File Exchange 中查找有关 Symbolic Math Toolbox 的更多信息

标签

Community Treasure Hunt

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

Translated by