poly

Polynomial with specified roots or characteristic polynomial.

Syntax

• p = poly(r)
• p = poly(A)

Input argument

• r - vector: polynomial roots
• A - matrix: input matrix

Output argument

• p - row vector: polynomial coefficients

Description

If A is a square matrix, p = poly(A) computes an n+1 element row vector. This result is composed the coefficients of the characteristic polynomial.

If r is a vector, p = poly(r) computes a row vector. This result is composed the coefficients of the polynomial roots of which are the elements of r.

Example

A = [1    2    3;
4    5    6;
7    8    1];
p = poly(A)

See also

conv, roots.

History

Author

Allan CORNET