清空筛选条件
清空筛选条件

Doing a symbolic Comparison of Coefficients for arbitrary length of coefficients

4 次查看（过去 30 天）
FBBVC
FBBVC 2020-3-7
回答： Walter Roberson 2020-3-7
Hello Folks,
I need to do a comparison of coefficients with an arbitray number of coeeficients. For example, Imagine the following PDE: with an initial function: . Inserting this into the PDE, derivate and solving yields a very long equation with different variations of sin/cos. Now here comes the question: How can I do (symbolic) comparison of coefficients, such that I get the following equations (only exemplary):
After receiving the equations, I want to transfer them into a system of equations. I read something about determining the coefficients by matlab itself, but I guess it is a problem that the number of coefficients depend on the length of my initial function. Is there any possibility to do this?
Thanks in advance!

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2020-3-7
You can subs() a variable for the expression cos(n*t) and then you can use coeffs() to extract the coefficients that it is multiplied by.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Boundary Conditions 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by