Lagrange Polynomials
Module to generate Lagrange polynomials over integers for 1-dimensional data. This is generally useful for interpolation.
Installation
Install with pip.
Usage
Example
from lagrange_polynomial import LagrangePolynomial
xs = range(100)
ys = [f(x) for x in xs] # For some function f
lp = LagrangePolynomial(xs, ys) # Instantiate a polynomial with sequences of
# x- and y-coordinates.
for x in xs:
assert ys[x] == lp(x) # Polynomial will intersect original points
coefficient = lp.basis[0](x) # Get the 0th basis vector at x
Interface
The LagrangePolynomial class takes two equally-sized sequences and an optional integer p.
The instance is a Lagrange polynomial L: x -> L(x) over GF(p). If p is not provided, it defaults to the 8th Mersenne prime M31.
It has a basis property, a LagrangeBasis object subclassing Sequence.
Each element ℓⱼ indexed by integers j in range(len(xs)) is a function taking x to its jth basis vector ℓⱼ(x).
Test
Test with make test.
1 maintainer
Metadata
1 maintainer
Release files for lagrange-polynomial 0.0.1
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