Write some equations as product between function-matrix and constant-matrix

5 次查看（过去 30 天）

Marco 2012-12-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/56736-write-some-equations-as-product-between-function-matrix-and-constant-matrix

Hi,

Is there some matlab command to collect functions and constant as two matrices or a matrix and a vector respectively. In other words, for example, if I have this symbolic system of equations:

m*x^2 + n*y = z1
b*x + c*y^2 = z2

Is there a way to getout, automatically, the system as product

Z = X*k

where X is a matrix of only function terms, not constant, at most 0 and k is a matrix (or a vector) of (and only) constants such that:

Z = [z1; z2];

I don't mind size of X and k

2 个评论
显示无隐藏无

Walter Roberson 2012-12-16

Something like coeffs() ?

Marco 2012-12-17

编辑：Marco 2012-12-17

Yes! I'll try to make it to rearrange like matrix product

Thanks

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Azzi Abdelmalek 2012-12-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/56736-write-some-equations-as-product-between-function-matrix-and-constant-matrix#answer_68677

编辑：Azzi Abdelmalek 2012-12-17

在 MATLAB Online 中打开

K*X=Z

%with:

 K=[0 m n 0;b 0 0 c]
 X=[x;x^2;y;y^2]
 Z=[z1;z2]

4 个评论
显示 2更早的评论隐藏 2更早的评论

Walter Roberson 2012-12-17

Marco wants to be able to input the symbolic expressions and have the matrices output.

Marco 2012-12-17

exactly!

请先登录，再进行评论。

请先登录，再回答此问题。

类别

MATLAB Mathematics

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

产品

Community Treasure Hunt

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

Start Hunting!

Translated by