characteristicPolynomial {qspray}

Characteristic polynomial

Description

Characteristic polynomial of a matrix.

Usage

characteristicPolynomial(A)

Arguments

A

a square matrix with numeric, character, or bigq entries

Value

A univariate qspray polynomial.

Examples

set.seed(666)
A <- matrix(rpois(9L, 10), nrow = 3, ncol = 3)
( P <- characteristicPolynomial(A) )
# check the roots are the eigen values:
f <- as.function(P, N = TRUE)
sapply(eigen(A)$values, f) # approx c(0, 0, 0)