polynomial of x and y

Question

Thrupthi Jain 2024-11-5，10:19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2164070-polynomial-of-x-and-y

回答： Anjaneyulu Bairi 2024-11-5，10:49

Input:

syms x y

p=x*y

q=y*x

Output:

p=x*y

q=x*y

In my code, x*y is not equal to y*x. I want q as y*x, not x*y. By default Matlab is treating x*y as y*x.

I need help with this.

Thank You.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Torsten 2024-11-5，10:36

MATLAB assumes commutativity of multiplication. Thus computations in general non-commutative rings or similar algebraic structures is not possible (at least to the best of my knowledge).

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Anjaneyulu Bairi 2024-11-5，10:49

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2164070-polynomial-of-x-and-y#answer_1541180

By default, MATLAB assumes all individual symbolic variables to be scalars, which inherently implies commutativity for scalar multiplication. Therefore, it is not possible to disable the commutative property for scalar symbolic variables in MATLAB.

Below MATLAB Answer might give you more information and there is a workaround mention which says define your symbols as matrices to remove commutative property.

https://www.mathworks.com/support/search.html/answers/505682-how-to-remove-commutativity-from-symbolic-multiplication.html