# poly

Polynomial construction, either as a characteristic polynomial, or from its roots.2021.1

R = poly(A)

R = poly(V)

## Inputs

A
A square matrix.
Dimension: matrix
V
A vector.
Dimension: vector

R
Vector.

## Examples

Vector input:

R = poly([1,2,3;2,3,4;3,4,6])
R = [Matrix] 1 x 4
1.00000  -10.00000  -2.00000  1.00000
Matrix input:
R = poly([1,3,5])
R = [Matrix] 1 x 4
1  -9  23  -15

For a square n x n matrix A, R contains the characteristic polynomial of A.

For a vector V, R contains the polynomial whose roots are the elements of x.