How to factor a matrix by a list of symbolic variables

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Fernando 2014-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/159513-how-to-factor-a-matrix-by-a-list-of-symbolic-variables

评论： Aleja Campo 2020-12-5

My problem is the following:

I have a 3x1 matrix of symbolic equations (let's call it Y) that I want to divide into two matrixes that we will call Phi and Theta. Phi will be a 3xn wide matrix, and Theta will be a nx1 column matrix. I have a list of variables that will be in the nx1 matrix, the rest will be in the Phi matrix, where Y = Phi*Theta.

Is there a way to factorize and build the matrixes programatically with the Symbolic Math Toolbox?

Thanks!

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Aleja Campo 2020-12-5

Hi

Yes I had the same problem, you can use the equationsToMatrix function

https://www.mathworks.com/help/symbolic/equationstomatrix.html

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Answer 1

Bruno Pop-Stefanov 2014-10-22

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Are the equations in Y linear in the variables in Theta? If yes, this is a simple linear system of equations, which you can solve symbolically with the linsolve function. Take a look at Solve a System of Linear Equations for an example.

If they are algebraic equations, you can try to use the solve function. Take a look at the example in Solve a System of Algebraic Equations.

In addition, you can have an overview of the equation-solving tools that Symbolic Math Toolbox provides in the documentation at:

Algebraic Equations and Systems