signal (version 0.7-2)

roots: Roots of a polynomial

Description

Roots of a polynomial

Usage

roots(x, method = c("polyroot", "eigen"))

Arguments

x

Polynomial coefficients with coefficients given in order from highest to lowest polynomial power. This is the Matlab/Octave convention; it is opposite of the convention used by polyroot.

method

Either polyroot (default) which uses polyroot for its computations internally (and is typically more accurate) or eigen which uses eigenvalues of the companion matri

Value

• A complex array with the roots of the polynomial.

References

Octave Forge http://octave.sf.net

See Also

polyroot, polyval, poly, conv

Examples

roots(1:3)
polyroot(3:1) # should be the same
poly(roots(1:3))

roots(1:3, method="eigen") # using eigenvalues