poly: Define Polynomial by Roots

In pracma: Practical Numerical Math Functions

Define Polynomial by Roots

Description

Define a polynomial by its roots.

Usage

  Poly(x)

Arguments

x	vector or square matrix, real or complex

Details

Computes the characteristic polynomial of an (n x n)-Matrix.

If x is a vector, Poly(x) is the vector of coefficients of the polynomial whose roots are the elements of x.

Value

Vector representing a polynomial.

Note

In Matlab/Octave this function is called poly().

See Also

polyval, roots

Examples

  Poly(c(1, -1, 1i, -1i))  # Solves x^4 -1 = 0
  # Wilkinson's example:
  roots(Poly(1:20))

pracma documentation built on Nov. 10, 2023, 1:14 a.m.