How to convert polynomial to matrix?

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Discussion Overview

The discussion revolves around the conversion of a polynomial, specifically a fourth-order polynomial, into a matrix form. Participants explore various methods and representations, including the use of Matlab and mathematical concepts such as companion matrices and the Cayley-Hamilton theorem.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant inquires about converting a fourth-order polynomial to a matrix, expressing confusion about the process.
  • Another participant suggests defining a basis for fourth-degree polynomials and representing the polynomial as a coefficient matrix, providing an example of how a polynomial can be represented as a vector.
  • A third participant references the concept of a companion matrix, explaining its relation to the characteristic polynomial and eigenvalues, and notes its applicability for polynomials of degree 4 or smaller.
  • Another participant mentions the Cayley-Hamilton theorem as a potential approach to the problem, though details are not elaborated.

Areas of Agreement / Disagreement

Participants present different methods and interpretations of converting a polynomial to a matrix, indicating that multiple competing views remain without a consensus on a singular approach.

Contextual Notes

Limitations include the lack of specificity in the initial inquiry, which may affect the applicability of the suggested methods. The discussion does not resolve how to achieve the desired matrix form directly.

Who May Find This Useful

Individuals interested in polynomial representations, matrix theory, or applications in Matlab may find this discussion relevant.

m2006
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How to convert polynomial to matrix?

Does anyone know how to convert a polynomial to a matrix. I have been told that it is possible to convert a fourth order polynomial to a 4x4 Matrix in Matlab but I have no clue how to go about it and how it is done. :confused: Any suggestions or even where to look would be GREATLY helpful!
 
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Can you be more specific about what you are trying to do?

If you were to choose a basis for the space of fourth degree polynomials, like [tex]\{ 1,x,x^2,x^3,x^4 \}[/tex], then it is possible to represent a polynomial as an element of this vector space by a coefficient matrix.

For example, [tex]3x^4-2x^2+5 \mapsto \left[5,0,-2,0,3 \right][/tex]. This is not a 4x4 matrix like you are looking for, but it is a representation of the polynomial as a matrix.

If you are more specific about what you are trying to do, maybe I can offer more insight, although I am not sure if what you want can be done.
 


check this out for making a companion matrix for a given polynomial:
http://en.wikipedia.org/wiki/Companion_matrix

The determinant of a companion matrix is a polynomial in λ, known as the characteristic polynomial. λs are the eigenvalues, they are also the solutions to the polynomial.

This works well for polynomials of degree 4 or smaller since they can be solved by a finite sequence of arithmetic operations and radicals.

hope this helps.
 


use cayley-Hamilton theorem from backwards,it will help...
 

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