MathObj.Polynomial
Description

Polynomials and rational functions in a single indeterminate. Polynomials are represented by a list of coefficients. All non-zero coefficients are listed, but there may be extra '0's at the end.

Usage: Say you have the ring of Integer numbers and you want to add a transcendental element x, that is an element, which does not allow for simplifications. More precisely, for all positive integer exponents n the power x^n cannot be rewritten as a sum of powers with smaller exponents. The element x must be represented by the polynomial [0,1].

In principle, you can have more than one transcendental element by using polynomials whose coefficients are polynomials as well. However, most algorithms on multi-variate polynomials prefer a different (sparse) representation, where the ordering of elements is not so fixed.

If you want division, you need Number.Ratios of polynomials with coefficients from a Algebra.Field.

You can also compute with an algebraic element, that is an element which satisfies an algebraic equation like x^3-x-1==0. Actually, powers of x with exponents above 3 can be simplified, since it holds x^3==x+1. You can perform these computations with Number.ResidueClass of polynomials, where the divisor is the polynomial equation that determines x. If the polynomial is irreducible (in our case x^3-x-1 cannot be written as a non-trivial product) then the residue classes also allow unrestricted division (except by zero, of course). That is, using residue classes of polynomials you can work with roots of polynomial equations without representing them by radicals (powers with fractional exponents). It is well-known, that roots of polynomials of degree above 4 may not be representable by radicals.

Synopsis
newtype T a = Cons {
 coeffs :: [a]
}
fromCoeffs :: [a] -> T a
showsExpressionPrec :: (Show a, C a, C a) => Int -> String -> T a -> String -> String
const :: a -> T a
eval :: C a b => T b -> a -> b
compose :: C a => T a -> T a -> T a
equal :: (Eq a, C a) => [a] -> [a] -> Bool
add :: C a => [a] -> [a] -> [a]
sub :: C a => [a] -> [a] -> [a]
negate :: C a => [a] -> [a]
shift :: C a => [a] -> [a]
unShift :: [a] -> [a]
mul :: C a => [a] -> [a] -> [a]
scale :: C a => a -> [a] -> [a]
divMod :: (C a, C a) => [a] -> [a] -> ([a], [a])
tensorProduct :: C a => [a] -> [a] -> [[a]]
tensorProduct' :: C a => [a] -> [a] -> [[a]]
mulShear :: C a => [a] -> [a] -> [a]
mulShearTranspose :: C a => [a] -> [a] -> [a]
horner :: C a b => a -> [b] -> b
horner' :: C a => a -> [a] -> a
progression :: C a => [a]
differentiate :: C a => [a] -> [a]
integrate :: C a => a -> [a] -> [a]
integrateInt :: (C a, C a) => a -> [a] -> [a]
fromRoots :: C a => [a] -> T a
alternate :: C a => [a] -> [a]
Documentation
 newtype T a Source
Constructors
Cons
 coeffs :: [a]
Instances
 Functor T C T C a b => C a (T b) (C a, C a b) => C a (T b) (Eq a, C a) => Eq (T a) (C a, Eq a, Show a, C a) => Fractional (T a) (C a, Eq a, Show a, C a) => Num (T a) Show a => Show (T a) (Arbitrary a, C a) => Arbitrary (T a) (C a, C a) => C (T a) C a => C (T a) C a => C (T a) C a => C (T a) C a => C (T a) (C a, C a) => C (T a) (C a, C a) => C (T a) (C a, C a) => C (T a)
 fromCoeffs :: [a] -> T a Source
 showsExpressionPrec :: (Show a, C a, C a) => Int -> String -> T a -> String -> String Source
 const :: a -> T a Source
 eval :: C a b => T b -> a -> b Source
 compose :: C a => T a -> T a -> T a Source

compose is the functional composition of polynomials.

It fulfills eval x . eval y == eval (compose x y)

 equal :: (Eq a, C a) => [a] -> [a] -> Bool Source
 add :: C a => [a] -> [a] -> [a] Source
 sub :: C a => [a] -> [a] -> [a] Source
 negate :: C a => [a] -> [a] Source
 shift :: C a => [a] -> [a] Source
Multiply by the variable, used internally.
 unShift :: [a] -> [a] Source
 mul :: C a => [a] -> [a] -> [a] Source
mul is fast if the second argument is a short polynomial, MathObj.PowerSeries.** relies on that fact.
 scale :: C a => a -> [a] -> [a] Source
 divMod :: (C a, C a) => [a] -> [a] -> ([a], [a]) Source
 tensorProduct :: C a => [a] -> [a] -> [[a]] Source
 tensorProduct' :: C a => [a] -> [a] -> [[a]] Source
 mulShear :: C a => [a] -> [a] -> [a] Source
 mulShearTranspose :: C a => [a] -> [a] -> [a] Source
 horner :: C a b => a -> [b] -> b Source
 horner' :: C a => a -> [a] -> a Source
Horner's scheme for evaluating an polynomial
 progression :: C a => [a] Source
 differentiate :: C a => [a] -> [a] Source
 integrate :: C a => a -> [a] -> [a] Source
 integrateInt :: (C a, C a) => a -> [a] -> [a] Source
Integrates if it is possible to represent the integrated polynomial in the given ring. Otherwise undefined coefficients occur.
 fromRoots :: C a => [a] -> T a Source
 alternate :: C a => [a] -> [a] Source