Solving an equation with symbolic matrix

6 次查看（过去 30 天）
Juan Ignacio Peña
Juan Ignacio Peña 2024-2-20
编辑： Torsten 2024-2-20
Ran in:
I've tried solving eq1 in the following program.
The right answer is w = -D*lambda*unos
%start
unos=ones(2,1)
unos = 2×1
1 1
ceros=zeros(2,1)
ceros = 2×1
0 0
E = symmatrix('E',2)
E = 
D=inv(E)
D = 
w=symmatrix('w',[2,1])
w = 
eq1= w + D*lambda*unos==ceros
Unrecognized function or variable 'lambda'.
solve(eq1,w)
%end
The right answer is w = -D*lambda*unos
But instead, I get the following message:
Check for incorrect argument data type or missing argument in call to function 'solve'.
Please help

请先登录，再回答此问题。

回答（1 个）

Torsten
Torsten 2024-2-20
  4 个评论
显示 2更早的评论
Juan Ignacio Peña
Juan Ignacio Peña 2024-2-20
Thank you, Torsten. I am interested in working with matrices as whole variables. I mean, considering matrices or vectors of generic size and with given assumptions (like symmetric, positive definite, etc), but without knowing the exact dimensions and elements. In my example, D is the inverse of a symmetric matrix, and I'm looking for the answer in terms of the matrix and not its elements.
As far as I understand, symmatrix2sym(D) converts a symbolic matrix variable D to an array of symbolic scalar variables S. I'm not interested in the elements of D. I am interested in working with D as a specific variable (of any dimension).
Torsten
Torsten 2024-2-20
编辑：Torsten 2024-2-20
Ok, then it doesn't seem possible in MATLAB.

请先登录，再进行评论。

类别

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

标签

产品


版本

R2021b

Community Treasure Hunt

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

Start Hunting!

Translated by